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Changelog

All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog.

Types of changes:

  • Added: for new features.
  • Changed: for changes in existing functionality.
  • Deprecated: for soon-to-be removed features.
  • Removed: for now removed features.
  • Fixed: for any bug fixes.
  • Security: in case of vulnerabilities.

UNRELEASED

Removed

  • The previously deprecated functions qiksit.visualization.plot_state and qiskit.visualization.iplot_state have been removed. Instead use the specific functions for each plot type (#2325).
  • International documentation of outdated readme etc (#2302)
  • Removed deprecated options in execute, transpile, and assemble. Removed deprecated compiler.
  • Removed deprecated qcvv in tools. Removed deprecated converters qobj_to_circuits and circuits_to_qobj (#2301)
  • The previously deprecated qiskit._util module has been removed. Use qiskit.util instead. (#2329)

0.8.0 - 2019-05-02

Added

  • Added exact and approximate decomposition of SU(4) to arbitrary supercontrolled basis
  • Introduced schedule lo configuration. (#2115)
  • Introduced pulse schedule assembler. (#2115)
  • Builtin library of continuous pulses and builtin library of discrete pulses which are obtained by sampling continuous pulses with default sampling strategy.
  • Sampler decorator and standard sampler library for conversion of continuous pulses to discrete SamplePulse (#2042).
  • Core StochasticSwap routine implimented in Cython (#1789).
  • Added QuantumChannel classes SuperOp, Choi, Kraus, Stinespring, PTM, Chi to quantum_info for manipulating quantum channels and CPTP maps.
  • Added Operator object to quantum_info for representing matrix operators.
  • Introduced the backend defaults model and endpoint for pulse backends (#2101).
  • meas_level to result schema (#2085).
  • Core StochasticSwap routine implemented in Cython (#1789).
  • New EnlargeWithAncilla pass for adding ancilla qubits after a Layout selection pass (#1603).
  • New Unroll2Q pass for unrolling gates down to just 1q or 2q gates (#1614).
  • Added support for register slicing when applying operations to a register (#1643).
  • Added in new parameter justify to the text, mpl and latex circuit drawers to say how the circuit should be aligned. (#1725, #1797, #1977)
  • Added function for purity of a mixed state in qiskit.quantum_information (#1733)
  • Added parameter to the TextProgressBar to allow the output to be sent to a different output stream
  • Added a __qiskit_version__ parameter to the qiskit namespace. This will contain a dictionary of versions for all installed qiskit elements. (#1885).
  • Added a RunConfig object for configurations related to running an experiment (e.g. shots, memory) (#1856)
  • Added a TranspileConfig object for configurations related to transforming circuits (e.g. basis_gates, coupling_map, initial_layout) (#1856)
  • Added a qiskit.compiler namespace for all functions that transpile, schedule and assemble circuits and pulses (#1856)
  • Added support for passing a list of basis_gates, coupling_map etc. to the qiskit.compiler.transpile() function, each corresponding to one of the circuits (#2163)
  • Added a qiskit.compiler.assemble_circuits() function to generate qobj from some circuits and a RunConfig (#1856)
  • execute() and assemble() allow setting a qobj_header, of type QobjHeader or dict, to add extra information to the qobj (and thus result).
  • Register indexing supports negative indices (#1875)
  • Added new resource estimation passes: Depth, Width, Size, CountOps, and NumTensorFactors, all grouped in the ResourceEstimation analysis pass.
  • Added nodes_on_wire() to DAGCircuit which returns an iterator over all the operations on the given wire
  • Added new properties to an Instruction: num_qubits, num_clbits (#1816).
  • Added a QuantumCircuit.append public method for appending arbitrary instructions to some qubits and clbits in the circuit (#1816).
  • Added an Instruction.definition property that defines a composite instruction in terms of other, simpler instructions (#1816).
  • Added an Instruction.mirror() method that mirrors a composite instruction (reverses its sub-instructions) (#1816).
  • Added an PassManager.passes() method that returns a list of the passes that have been added to the pass manager, including options and flow controllers.
  • Added a PassManager.run() that transforms a QuantumCircuit according to its pass schedule and returns a QuantumCircuit.
  • Added a qiskit.quantum_info.random for generating random states, unitaries, etc (#2119).
  • Added a qiskit.quantum_info.synthesis for algorithms that synthesize circuits (#2119).
  • Added a NoiseAdaptiveLayout pass to compute a backend calibration-data aware initial qubit layout. (#2089)
  • Gates and instructions in a circuit accept integers as parameters to refer to wires instead of named bits.
  • Added a OptimizeSwapBeforeMeasure pass that removes the swap gates when they are followed by a measurement instruction, moving the latter to the proper wire. (#1890)
  • Added a RemoveDiagonalGatesBeforeMeasure pass that removes the diagonal gates when they are followed by a measurement instruction. (#2208)
  • Added a CommutativeCancellation pass that cancels self-inverse gates and combines rotations about the Z axis, leveraging previously-found gate commutation relations. (#2012)
  • Add an option for using a user config file to enable changing default settings for various functions in qiskit. Right now it only supports setting the default circuit drawing backend. (#2122)
  • Added a Collect2qBlocks pass that analyzes the circuit for uninterrupted sequences of gates (blocks) acting on 2 qubits. (#2134)
  • Added a ConsolidateBlocks that turns previously-collected blocks of any size into equivalent Unitary operators in the circuit. (#2134)
  • Added support for parameterized circuits. (#2103)
  • Added preset PassManagers that offer predetermined pipelines of transpiler passes. (#2163)

Changed

  • require scipy>=1.0, use scipy.stats.unitary_group.rvs for random_unitary().
  • two_qubit_kak decomposition works with Operator or raw matrix input objects.
  • process_fidelity works with QuantumChannel and Operator object inputs.
  • Backend defaults values are no longer required (#2101).
  • QuantumCircuit properties more self-consistent and no longer need DAG (#1993).
  • The most connected subset in DenseLayout is now reduced bandwidth (#2021).
  • plot_histogram now allows sorting by Hamming distance from target_string (#2064).
  • FunctionalPulse is no longer a class and instead is a decorator, functional_pulse that returns a SamplePulse when called. (#2043)
  • Changed average_data to accept observable input in matrix form (#1858)
  • Change random_state to take in dim over number of qubits (#1857)
  • The Exception subclasses have been moved to an .exceptions module within each package (for example, qiskit.exceptions.QiskitError) (#1600).
  • The QiskitTestCase and testing utilities are now included as part of qiskit.test and thus available for third-party implementations, with convenience test cases for providers and backends. (#1616, #1844)
  • The snapshot instruction now takes label and snap_type instead of slot (#1615).
  • The test folders have been reorganized to match the python modules (#1625)
  • The circuits_to_qobj no longers uses the unrollers (#1629)
  • The previously deprecated default output of circuit_drawer() (using latex and falling back to mpl) is no longer present. Instead the default output is the ascii art text output backend.
  • Changed param to params in Instruction (#1665).
  • dag_drawer and plot_gate_map are available via importing qiskit.tools.visualization. They will raise at the point of use, if dependencies are not installed (#1669).
  • The qiskit.validation schemas are now strict and raise a more specific ModelValidationError (#1695).
  • The default transpile pipeline will now add a barrier before the set of final measurements when compiling for both simulators and devices (#1591).
  • Purity function in qiskit.tools.qi.qi calls new version in qiskit.quantum_information and issues deprecation warning (#1733)
  • Updated dag.node_counter to return the current number of nodes (#1763)
  • The argument basis_gates used in compile, execute, and transpile is not longer a comma-separated string but a list of strings. For example, this basis ['u1','u2','u3','cx'] should be used instead of 'u1,u2,u3,cx' (#1333)
  • Methods on the DAGCircuit which previously returned node_ids and/or dicts now return DAGNodes
  • The Qobj classes have been reimplemented using models and schemas, as the rest of spec-defined entities. (#1909).
  • The rzz gate is now represented as a line when printed in text (#1957).
  • Text drawer has support for multi-q gates (#1939).
  • Separate Qobj into PulseQobj and QasmQobj (#1969).
  • It is possible to define a layout as a list of integers. This maps the ordered list of virtual circuit qubits to physical qubits as defined by the list of integers (#1946).
  • Instructions no longer have context about where they are in a circuit. Instead, the circuit keeps this context. So Instructions are now light-weight and only have a name, num_qubits, num_clbits and params (#1816).
  • The old syntax for attaching a gate to the circuit then modifying it is no longer supported (e.g. circuit.s(qr).inverse() or circuit.s(qr).c_if(cr, 4)). Instead, you must first modify the gate then attach it (#1816).
  • QuantumCircuit.data now contains a list of tuples, where each tuple is a (instruction, qarg, carg) (#1816).
  • The visualization subpackage has moved from qiskit.tools.visualization to qiskit.visualization. The public API (which was declared stable in the 0.7 release) is still accessible off of qiskit.tools.visualization. (#1878)
  • Layout object can now only be constructed from a dictionary, and must be bijective (#2157).
  • transpile() accepts initial_layout in the form of dict, list or Layout (#2157).
  • Not specifying a basis in execute() or transpile() no longer defaults to unrolling to the ['u1', 'u2', 'u3', 'cx'] basis. Instead the default behavior is to not unroll, unless specifically requested (#2166).
  • Instruction.copy() is now a shallow copy instead of deep (#2214)
  • Layout and CouplingMap classes are now accessible from qiskit.transpiler (#2222).

Deprecated

  • The methods prefixed by _get in the DAGCircuit object are being renamed without that prefix (see #1346)
  • Changed elements in couplinglist of CouplingMap from tuples to lists (#1666).
  • Unroller bases must now be explicit, and violation raises an informative QiskitError (#1802).
  • The qiskit.tools.qcvv package is deprecated in favor of Qiskit Ignis (#1884).
  • The qiskit.compile() function is now deprecated in favor of explicitly using the qiskit.compiler.transpile() function to transform a circuit followed by qiskit.compiler.assemble() to make a qobj out of it.
  • qiskit.converters.qobj_to_circuits() has been deprecated and will be removed in a future release. Instead qiskit.compiler.disassemble_circuits() should be used to extract QuantumCircuit objects from a compiled qobj. (#2137)
  • The qiskit.transpiler.transpile() function is deprecated in favor of qiskit.compiler.transpile() (#2166).
  • The seed_mapper argument in transpile() and execute() is deprecated in favor of seed_transpile(), which sets the seed for all stochastic stages of the transpiler (#2166).
  • The seed argument is execute() is deprecated in favor of seed_simulator (#2166).
  • The pass_manager argument in transpile() is deprecated. Instead, the pass_manager.run() methdod can be used directly to transform the circuit (#2166).
  • The qiskit._util module is deprecated and replaced by qiskit.util. qiskit._util will be removed in the 0.9 release. (#2154)

Fixed

  • Fixed #1892, whereby inheriting from QuantumRegister or ClassicalRegister would cause a QiskitError in instruction.py (#1908).
  • Fixed #829 by removing dependence on scipy unitary_group (#1857).
  • Fixed a bug with measurement sampling optimization in BasicAer qasm_simulator (#1624).
  • Fixed a bug where barriers didn't plot over all qubits when using matplotlib (#1718).
  • Fixed a minor conda env bug in Makefile (#1691).
  • Fixed a bug in BasicMapper pass operating over multiple registers (#1611).
  • Fixed a bug in BarrierBeforeFinalMeasurements which incorrectly moved measurements used in conditional operations (#1705).
  • Fixed a bug that with transpile ignoring initial layout when coupling map is provided (#1711).
  • Fixed a bug in the definition of the rzz gate (#1940).
  • Fixed a bug in DAGCircuit.collect_runs() that did not exclude conditional gates (#1943).
  • Fixed a mapping issue with layouts on non-adjacent qubits, by adding ancillas (#2023).
  • Fixed a bug in which an initial_layout could be changed even if it made the circuit compatible with the device coupling_map (#2036).
  • Fixed qobj_to_circuits for circuits that contain initialize instructions (#2138)

Removed

  • The previously deprecated functions plot_circuit(), latex_circuit_drawer(), generate_latex_source(), and matplotlib_circuit_drawer() from qiskit.tools.visualization have been removed. The circuit_drawer() function from the same module should be used instead.
  • The previously deprecated keys plot_barriers and reverse_bits keys in the style kwarg dict are deprecated, instead the qiskit.tools.visualization.circuit_drawer() kwargs plot_barriers and reverse_bits should be used instead.
  • Removed the wrapper folder as part of the post 0.7 cleanup (#1613).
  • Removed the python wrappers of the legacy simualtors now that Qiskit Aer is out (#1615).
  • Removed simulator instructions save, load, wait, noise as unsupported in Aer (#1615).
  • Removed circuit.add as deprecated (#1627)
  • Removed the unroller (#1629)
  • Removed deprecated result methods (#1659)
  • Removed deprecated couplingdict kwarg from CouplingMap (#1666)
  • Removed deprecated transpile_dag() format kwarg (#1664)
  • Removed deprecated Pauli v, w, and pauli_group case arg as int (#1680)
  • Removed deprecated state_fidelity() function from tools.qi (#1681)
  • Removed QISKitError in favor of QiskitError. (#1684)
  • The IBMQ provider (qiskit.providers.ibmq) has been moved to its own package (pip install qiskit-ibmq-provider). (#1700)
  • compiled_circuit_qasm has been removed from the Qobj header, since it was part of the pre-qobj specification (#1715).
  • Removed the wigner plotting functions plot_wigner_function, plot_wigner_curve, plot_wigner_plaquette, and plot_wigner_data (#1860).
  • Removed Instruction.reapply() method (#1816).

0.7.2 - 2019-05-01

Fixed

  • A potential issue where the backend configuration schema validation would improperly reject valid responses from the API (#2258)

0.7.1 - 2019-03-04

Fixed

  • Fixed a bug with measurement sampling optimization in BasicAer qasm_simulator (#1624).

0.7.0 - 2018-12-19

Added

  • Added DAG visualizer which requires Graphivz (#1059)
  • Added an ASCII art circuit visualizer (#909)
  • The QuantumCircuit class now returns an ASCII art visualization when treated as a string (#911)
  • The QuantumCircuit class now has a draw() method which behaves the same as the qiskit.tools.visualization.circuit_drawer() function for visualizing the quantum circuit (#911)
  • A new method hinton can be used on qiskit.tools.visualization.plot_state() to draw a hinton diagram (#1246)
  • Two new constructor methods, from_qasm_str() and from_qasm_file(), to create a QuantumCircuit object from OpenQASM were added to the QuantumCircuit class. (#1172)
  • New methods in QuantumCircuit for common circuit metrics: size(), depth(), width(), count_ops(), num_tensor_factors() (#1285)
  • Added backend_monitor and backend_overview Jupyter magics, as well as plot_coupling_map (#1231)
  • Added a Layout object (#1313)
  • New plot_bloch_multivector() to plot Bloch vectors from a tensored state vector or density matrix. (#1359)
  • Per-shot measurement results are available in simulators and select devices. Request them by setting memory=True in compile()/execute(), and retrieve them from result.get_memory() (#1385).
  • Added a qiskit.converters module for translation between commonly used representations of a circuit: dag_to_circuits, circuits_to_dag, qobj_to_circuits, circuits_to_qobj, ast_to_dag.
  • PassManager can schedule passes at __init__ time (#1510).
  • Added a .qobj() method for IBMQ and local simulator Jobs (#1532).
  • New Decompose pass for decomposing a gate according to a rule (#1487).
  • New Unroller pass in the transpiler for unrolling up to some basis (#1455).
  • New BarrierBeforeFinalMeasurements pass for preventing final measure reorder (#1538).
  • New CommutationAnalysis and CommutationTransformation transpiler passes for modifying a DAG based on gate commutativity relations (#1500).
  • New transpiler mapper pass: BasicSwap (#1270).
  • New transpiler mapper pass: LookaheadSwap (#1140).
  • New transpiler mapper pass: StochasticSwap (#1520).
  • New CXDirection pass for fixing the direction of cx gates (#1410).
  • New CheckMap pass for checking if circuit meets mapping requirements (#1433).
  • New Optimize1QGate pass for combining chains of 1q rotations (#1442).

Changed

  • Schedules and underlying classes are now immutable. (#2186)
  • Evolved pass-based transpiler to support advanced functionality (#1060)
  • .retrieve_job() and .jobs() no longer returns results by default, instead the result must be accessed by the result() method on the job objects (#1082).
  • Make backend.status() dictionary conform with schema.
  • The different output backends for the circuit_drawer() visualizations have been moved into separate private modules in qiskit.tools.visualizations. (#1105, #1111)
  • DAG nodes contain pointers to Register and Instruction objects, rather than their string names (#1189).
  • Upgraded some external dependencies to:
    • networkx>=2.2 (#1267).
  • The qiskit.tools.visualization.circuit_drawer() method now returns a matplotlib.Figure object when the mpl output is used and a TextDrawer object when text output is used. (#1224, #1181)
  • Speed up the Pauli class and extended its operators (#1271 #1166).
  • IBMQ.save_account() now takes an overwrite option to replace an existing account on disk. Default is False (#1295).
  • Backend and Provider methods defined in the specification use model objects rather than dicts, along with validation against schemas (#1249, #1277, #1350). The updated methods include: - backend.status() (#1301). - backend.configuration() (and __init__) (#1323). - backend.properties(), returning None for sims (#1331, #1401). - qiskit.Result (#1360).
  • backend.provider() is now a method instead of a property (#1312).
  • Remove local backend (Aer) fallback (#1303)
  • The signatures for the plotting functions in qiskit.tools.visualization._counts_visualization.py, qiskit.tools.visualization._state_visualization.py, and qiskit.tools.visualization.interactive have been modified to make them in-line with standard Matplotlib calling conventions (#1359).
  • Remove local backend (Aer) fallback (#1303).
  • DAGCircuits store Instruction and Register objects, instead of name references. The DAGCircuit class methods are updated accordingly (#1210).
  • transpile() now takes QuantumCircuit(s) to QuantumCircuit(s), and DAG processing is only done internally (#1397).
  • The different unrollers are deprecated. The only unrolling happens from DAG to DAG (#1210).
  • Moved all the circuit modules into a circuit module but for most users it is still imported in the top level for QuantumCircuit, QuantumRegister, ClassicalRegister
  • qiskit.backends has been renamed to qiskit.providers (#1531).
  • qiskit.backends.aer has been removed in favor of qiskit.providers.builtinsimulators (Python simulators) and qiskit.providers.legacysimulators (C++ simulators) (#1484)
  • Aer in qiskit root module depends on having the qiskit-aer package installed, by default it is not present. Instead there are 2 new provider instances in the root module BasicAer which provides the Python simulators and LegacySimulators which provides the old C++ simulators in qiskit-terra. (#1484)

Deprecated

  • plot_circuit(), latex_circuit_drawer(), generate_latex_source(),
    and matplotlib_circuit_drawer() from qiskit.tools.visualization are deprecated. Instead the circuit_drawer() function from the same module should be used. (#1055)
  • The current default output of circuit_drawer() (using latex and falling
    back on python) is deprecated and will be changed in the future. (#1055)
  • The qiskit.wrapper.load_qasm_string() and qiskit.wrapper.load_qasm_file() functions are deprecated and the QuantumCircuit.from_qasm_str() and QuantumCircuit.from_qasm_file() contstructor methods should be used instead (#1172)
  • The plot_barriers and reverse_bits keys in the style kwarg dict are deprecated, instead the qiskit.tools.visualization.circuit_drawer() kwargs plot_barriers and reverse_bits should be used instead. (#1180)
  • The transpile_dag() function format kwarg for emitting different output formats is deprecated (#1319).
  • Several methods of qiskit.Result have been deprecated (#1360).
  • The functions plot_state() and iplot_state() have been depreciated. Instead the functions plot_state_*() and iplot_state_*() should be called. (#1359)
  • The skip_transpiler arg has been deprecated from compile() and execute() in favor of using the PassManager directly.

Fixed

  • Fixed a variety of typos throughout sources (#1139)
  • Fixed horizontal spacing when drawing barriers before CCNOT gates in latex circuit plots (#1051)
  • Use case insensitive matching when comparing premium account URLs. (#1102)
  • Fixed AerJob status when the submitted Job is in a PENDING state. (#1215)
  • Add fallback for when CPU count can't be determined (#1214)
  • Fix random_state from returning nan (#1258)
  • The Clifford simulator run() method now works correctly with the updated AerJob usage (#1125)
  • Fixed an edge case when connection checks would raise an unhandled exception (#1226)
  • Fixed a bug where the transpiler moved middle-of-circuit measurements to the end (#1334)
  • The number_to_keep kwarg in plot_histgram() now functions correctly (#1359).
  • parallel_map no longer creates a progress bar for a single circuit (#1394).
  • The timeout parameter is now passed into the inner _wait_for_submission function in IBMQJob from _wait_for_result (#1542).

Removed

  • Remove register, available_backends (#1131).
  • Remove tools/apps (#1184).
  • Removed the dependency on IBMQuantumExperience, as it is now included in qiskit.backends.IBMQ (#1198).
  • matplotlib is no longer in the package requirements and is now an optional dependency. In order to use any matplotlib based visualizations (which includes the qiskit.tools.visualization.circuit_drawer() mpl output, qiskit.tools.visualization.plot_state, qiskit.tools.visualization.plot_histogram, and qiskit.tools.visualization.plot_bloch_vector you will now need to ensure you manually install and configure matplotlib independently.
  • The basis kwarg for the circuit_drawer() function to provide an alternative list of basis gates has been removed. Instead users should adjust the basis gates prior to visualizing the circuit. (#1151)
  • backend.parameters() and backend.calibration() have been fully deprecated, in favour of backend.properties() (#1305).
  • The qiskit.tools.file_io module has been removed. Conversion between qiskit.Result and json can be achieved using .to_dict() and .from_dict() directly (#1360).
  • The qiskit.Result class method for len() and indexing have been removed, along with the functions that perform post-processing (#1351).
  • The get_snapshot() and get_snapshots() method from the Result class has been removed. Instead you can access the snapshots in a Result using Result.data()['snapshots'].
  • Completed the deprecation of job.backend_name(), job.id(), and the backend_name parameter in its constructor.
  • The qiskit.Result class now does post-processing of results returned from backends if they are called via the Result.get_xxx() methods (i.e. get_counts(), get_memory(), get_statevector(), get_unitary()). The raw data is accessible through Result.data() (#1404).
  • The transpile() function kwarg format has been removed and will always return a circuit object. Instead you'll need to manually convert the output with the functions provided in qiskit.converters.

0.6.0 - 2018-10-04

Added

  • Added SchemaValidationError to be thrown when schema validation fails (#881)
  • Generalized Qobj schema validation functions for all qiskit schemas (#882).
  • Added decorator to check for C++ simulator availability (#662)
  • It is possible to cancel jobs in non comercial backends (#687)
  • Introduced new qiskit.IBMQ provider, with centralized handling of IBMQ credentials (qiskitrc file, environment variables). (#547, #948, #1000)
  • Add OpenMP parallelization for Apple builds of the cpp simulator (#698).
  • Add parallelization utilities (#701)
  • Parallelize transpilation (#701)
  • New interactive visualizations (#765).
  • Added option to reverse the qubit order when plotting a circuit. (#762, #786)
  • Jupyter notebook magic function qiskit_job_status, qiskit_progress_bar (#701, #734)
  • Add a new function qobj_to_circuits to convert a Qobj object to a list of QuantumCircuit objects (#877)
  • Allow selective loading of accounts from disk via hub/group/project filters to IBMQ.load_accounts().
  • Add new job_monitor function to automaically check the status of a job (#975).

Changed

  • Schema tests in tests/schemas/test_schemas.py replaced with proper unit test (#834).
  • Renamed QISKit to Qiskit in the documentation. (#634)
  • Use Qobj as the formally defined schema for sending information to the devices: - introduce the qiskit.qobj module. (#589, #655) - update the Qobj JSON schema. (#668, #677, #703, #709) - update the local simulators for accepting Qobj as input. (#667) - update the Result class. (#773)
  • Use get_status_job() for checking IBMQJob status. (#641)
  • Q network hub/group/project credentials replaced by new url format. (#740)
  • Breaking change: Jobs API simplification. (#686)
  • Breaking change: altered tomography APIs to not use QuantumProgram. (#818)
  • Breaking change: BaseBackend API changed, properties are now methods (#858)
  • When plot_histogram() or plot_state() are called from a jupyter notebook if there is network connectivity the interactive plots will be used by default (#862, #866)
  • Breaking change: BaseJob API changed, any job constructor must be passed the backend used to run them and a unique job id (#936).
  • Add support for drawing circuit barriers to the latex circuit drawer. This requires having the LaTeX qcircuit package version >=2.6.0 installed (#764)

Deprecated

  • The number_to_keep kwarg on the plot_histogram() function is now deprecated. A field of the same name should be used in the option dictionary kwarg instead. (#866)
  • Breaking change: backend.properties() instead of backend.calibration() and backend.parameters() (#870)

Removed

  • Removed the QuantumProgram class. (#724)

Fixed

  • Fixed get_ran_qasm methods on Result instances (#688).
  • Fixed probabilities_ket computation in C++ simulator (#580).
  • Fixed bug in the definition of cswap gate and its test (#685).
  • Fixed the examples to be compatible with version 0.5+ (#672).
  • Fixed swap mapper using qubits after measurement (#691).
  • Fixed error in cpp simulator for 3+ qubit operations (#698).
  • Fixed issue with combining or extending circuits that contain CompositeGate (#710).
  • Fixed the random unitary generation from the Haar measure (#760).
  • Fixed the issue with control lines spanning through several classical registers (#762).
  • Fixed visualizations crashing when using simulator extensions (#885).
  • Fixed check for network connection when loading interactive visualizations (#892).
  • Fixed bug in checking that a circuit already matches a coupling map (#1024).

0.5.7 - 2018-07-19

Changed

  • Add new backend names support, with aliasing for the old ones.

0.5.6 - 2018-07-06

Changed

  • Rename repository to qiskit-terra (#606).
  • Update Bloch sphere to QuTiP version (#618).
  • Adjust margin of matplotlib_circuit_drawer (#632)

Removed

  • Remove OpenQuantumCompiler (#610).

Fixed

  • Fixed broken process error and simulator slowdown on Windows (#613).
  • Fixed yzy_to_zyz bugs (#520, #607) by moving to quaternions (#626).

0.5.5 - 2018-07-02

Added

  • Retrieve IBM Q jobs from server (#563, #585).
  • Add German introductory documentation (doc/de) (#592).
  • Add unregister() for removing previously registered providers (#584).
  • Add matplotlib-based circuit drawer (#579).
  • Adding backend filtering by least busy (#575).
  • Allow running with new display names for IBMQ devices, and return those from available_backends() (#566)
  • Introduce Qiskit Transpiler and refactor compilation flow (#578)
  • Add CXCancellation pass (#578)

Changed

  • Remove backend filtering in individual providers, keep only in wrapper (#575).
  • Single source of version information (#581)
  • Bumped IBMQuantumExperience dependency to 1.9.6 (#600).
  • For backend status, status['available'] is now status['operational'] (#609).
  • Added support for registering third-party providers in register() (#602).
  • Order strings in the output of available_backends() (#566)

Removed

  • Remove Clifford simulator from default available_backends, until its stable release (#555).
  • Remove ProjectQ simulators for moving to new repository (#553).
  • Remove QuantumJob class (#616)

Fixed

  • Fix issue with unintended inversion of initializer gates (#573).
  • Fix issue with skip_transpiler causing some gates to be ignored silently (#562).

0.5.4 - 2018-06-11

Added

  • Performance improvements:
    • remove deepcopies from dagcircuit, and extra check on qasm() (#523).

Changed

  • Rename repository to qiskit-core (#530).
  • Repository improvements: new changelog format (#535), updated issue templates (#531).
  • Renamed the specification schemas (#464).
  • Convert LocalJob tests into unit-tests. (#526)
  • Move wrapper load_qasm_* methods to a submodule (#533).

Removed

  • Remove Sympy simulators for moving to new repository (#514)

Fixed

  • Fix erroneous density matrix and probabilities in C++ simulator (#518)
  • Fix hardcoded backend mapping tests (#521)
  • Removed _modifiers call from reapply (#534)
  • Fix circuit drawer issue with filename location on windows (#543)
  • Change initial qubit layout only if the backend coupling map is not satisfied (#527)
  • Fix incorrect unrolling of t to tdg in CircuitBackend (#557)
  • Fix issue with simulator extension commands not reapplying correctly (#556)

0.5.3 - 2018-05-29

Added

  • load_qasm_file / load_qasm_string methods

Changed

  • Dependencies version bumped

Fixed

  • Crash in the cpp simulator for some linux platforms
  • Fixed some minor bugs

0.5.2 - 2018-05-21

Changed

  • Adding Result.get_unitary()

Deprecated

  • Deprecating ibmqx_hpc_qasm_simulator and ibmqx_qasm_simulator in favor of ibmq_qasm_simulator.

Fixed

  • Fixing a Mapper issue.
  • Fixing Windows 7 builds.

0.5.1 - 2018-05-15

  • There are no code changes.

    MacOS simulator has been rebuilt with external user libraries compiled statically, so there’s no need for users to have a preinstalled gcc environment.

    Pypi forces us to bump up the version number if we want to upload a new package, so this is basically what have changed.

0.5.0 - 2018-05-11

Improvements

  • Introduce providers and rework backends (#376).
    • Split backends into local and ibmq.
    • Each provider derives from the following classes for its specific requirements (BaseProvider, BaseBackend, BaseJob).
    • Allow querying result by both circuit name and QuantumCircuit instance.
  • Introduce the Qiskit wrapper (#376).
    • Introduce convenience wrapper functions around commonly used Qiskit components (e.g. compile and execute functions).
    • Introduce the DefaultQISKitProvider, which acts as a context manager for the current session (e.g. providing easy access to all available_backends).
    • Avoid relying on QuantumProgram (eventual deprecation).
    • The functions are also available as top-level functions (for example, qiskit.get_backend()).
  • Introduce BaseJob class and asynchronous jobs (#403).
    • Return BaseJob after run().
    • Mechanisms for querying status and results, or to cancel a job.
  • Introduce a skip_transpiler flag for compile() (#411).
  • Introduce schemas for validating interfaces between qiskit and backends (#434) - qobj_schema - result_schema - job_status_schema - default_pulse_config_schema - backend_config_schema - backend_props_schema - backend_status_schema
  • Improve C++ simulator (#386)
    • Add tensor_index.hpp for multi-partite qubit vector indexing.
    • Add qubit_vector.hpp for multi-partite qubit vector algebra.
    • Rework C++ simulator backends to use QubitVector class instead of std::vector.
  • Improve interface to simulator backends (#435)
    • Introduce local_statevector_simulator_py and local_statevector_simulator_cpp.
    • Introduce aliased and deprecated backend names and mechanisms for resolving them.
    • Introduce optional compact flag to query backend names only by unique function.
    • Introduce result convenience functions get_statevector, get_unitary
    • Add snapshot command for caching a copy of the current simulator state.
  • Introduce circuit drawing via circuit_drawer() and plot_circuit() (#295, #414)
  • Introduce benchmark suite for performance testing (test/performance) (#277)
  • Introduce more robust probability testing via assertDictAlmostEqual (#390)
  • Allow combining circuits across both depth and width (#389)
  • Enforce string token names (#395)

Fixed

  • Fix coherent error bug in local_qasm_simulator_cpp (#318)
  • Fix the order and format of result bits obtained from device backends (#430)
  • Fix support for noises in the idle gate of local_clifford_simulator_cpp (#440)
  • Fix JobProcessor modifying input qobj (#392) (and removed JobProcessor during #403)
  • Fix ability to apply all gates on register (#369)

Deprecated

  • Some methods of QuantumProgram are soon to be deprecated. Please use the top-level functions instead.
  • The Register instantiation now expects size, name. Using name, size is still supported but will be deprecated in the future.
  • Simulators no longer return wavefunction by setting shots=1. Instead, use the local_statevector_simulator, or explicitly ask for snapshot.
  • Return job instance after run(), rather than result.
  • Rename simulators according to PROVIDERNAME_SIMPLEALIAS_simulator_LANGUAGEORPROJECT
  • Move simulator extensions to qiskit/extensions/simulator
  • Move Rzz and CSwap to standard extension library

0.4.15 - 2018-05-07

Fixed

  • Fixed an issue with legacy code that was affecting Developers Challenge.

0.4.14 - 2018-04-18

Fixed

  • Fixed an issue about handling Basis Gates parameters on backend configurations.

0.4.13 - 2018-04-16

Changed

  • OpenQuantumCompiler.dag2json() restored for backward compatibility.

Fixed

  • Fixes an issue regarding barrier gate misuse in some circumstances.

0.4.12 - 2018-03-11

Changed

  • Improved circuit visualization.
  • Improvements in infrastructure code, mostly tests and build system.
  • Better documentation regarding contributors.

Fixed

  • A bunch of minor bugs have been fixed.

0.4.11 - 2018-03-13

Added

  • More testing :)

Changed

  • Stabilizing code related to external dependencies.

Fixed

  • Fixed bug in circuit drawing where some gates in the standard library were not plotting correctly.

0.4.10 - 2018-03-06

Added

  • Chinese translation of README.

Changed

  • Changes related with infrastructure (linter, tests, automation) enhancement.

Fixed

  • Fix installation issue when simulator cannot be built.
  • Fix bug with auto-generated CNOT coherent error matrix in C++ simulator.
  • Fix a bug in the async code.

0.4.9 - 2018-02-12

Changed

  • CMake integration.
  • QASM improvements.
  • Mapper optimizer improvements.

Fixed

  • Some minor C++ Simulator bug-fixes.

0.4.8 - 2018-01-29

Fixed

  • Fix parsing U_error matrix in C++ Simulator python helper class.
  • Fix display of code-blocks on .rst pages.

0.4.7 - 2018-01-26

Changed

  • Changes some naming conventions for amp_error noise parameters to calibration_error.

Fixed

  • Fixes several bugs with noise implementations in the simulator.
  • Fixes many spelling mistakes in simulator README.

0.4.6 - 2018-01-22

Changed

  • We have upgraded some of out external dependencies to:

    • matplotlib >=2.1,<2.2
    • networkx>=1.11,<2.1
    • numpy>=1.13,<1.15
    • ply==3.10
    • scipy>=0.19,<1.1
    • Sphinx>=1.6,<1.7
    • sympy>=1.0

0.4.4 - 2018-01-09

Changed

  • Update dependencies to more recent versions.

Fixed

  • Fix bug with process tomography reversing qubit preparation order.

0.4.3 - 2018-01-08

Removed

  • Static compilation has been removed because it seems to be failing while installing Qiskit via pip on Mac.

0.4.2 - 2018-01-08

Fixed

  • Minor bug fixing related to pip installation process.

0.4.0 - 2018-01-08

Added

  • Job handling improvements.
    • Allow asynchronous job submission.
    • New JobProcessor class: utilizes concurrent.futures.
    • New QuantumJob class: job description.
  • Modularize circuit "compilation".
    Takes quantum circuit and information about backend to transform circuit into one which can run on the backend.
  • Standardize job description.
    All backends take QuantumJob objects which wraps qobj program description.
  • Simplify addition of backends, where circuits are run/simulated.
    • qiskit.backends package added.
    • Real devices and simulators are considered "backends" which inherent from BaseBackend.
  • Reorganize and improve Sphinx documentation.
  • Improve unittest framework.
  • Add tools for generating random circuits.
  • New utilities for fermionic Hamiltonians (qiskit/tools/apps/fermion).
  • New utilities for classical optimization and chemistry (qiskit/tools/apps/optimization).
  • Randomized benchmarking data handling.
  • Quantum tomography (qiskit/tools/qcvv).
    Added functions for generating, running and fitting process tomography experiments.
  • Quantum information functions (qiskit/tools/qi).
    • Partial trace over subsystems of multi-partite vector.
    • Partial trace over subsystems of multi-partite matrix.
    • Flatten an operator to a vector in a specified basis.
    • Generate random unitary matrix.
    • Generate random density matrix.
    • Generate normally distributed complex matrix.
    • Generate random density matrix from Hilbert-Schmidt metric.
    • Generate random density matrix from the Bures metric.
    • Compute Shannon entropy of probability vector.
    • Compute von Neumann entropy of quantum state.
    • Compute mutual information of a bipartite state.
    • Compute the entanglement of formation of quantum state.
  • Visualization improvements (qiskit/tools).
    • Wigner function representation.
    • Latex figure of circuit.
  • Use python logging facility for info, warnings, etc.
  • Auto-deployment of sphinx docs to github pages.
  • Check IBMQuantumExperience version at runtime.
  • Add QuantumProgram method to reconfigure already generated qobj.
  • Add Japanese introductory documentation (doc/ja).
  • Add Korean translation of readme (doc/ko).
  • Add appveyor for continuous integration on Windows.
  • Enable new IBM Q parameters for hub/group/project.
  • Add QuantumProgram methods for destroying registers and circuits.
  • Use Sympy for evaluating expressions.
  • Add support for ibmqx_hpc_qasm_simulator backend.
  • Add backend interface to Project Q C++ simulator.
    Requires installation of Project Q.
  • Introduce Initialize class.
    Generates circuit which initializes qubits in arbitrary state.
  • Introduce local_qiskit_simulator a C++ simulator with realistic noise.
    Requires C++ build environment for make-based build.
  • Introduce local_clifford_simulator a C++ Clifford simulator.
    Requires C++ build environment for make-based build.

Changed

  • The standard extension for creating U base gates has been modified to be consistent with the rest of the gate APIs (see #203).

Removed

  • The silent parameter has been removed from a number of QuantumProgram methods. The same behaviour can be achieved now by using the enable_logs() and disable_logs() methods, which use the standard Python logging.

Fixed

  • Fix basis gates (#76).
  • Enable QASM parser to work in multiuser environments.
  • Correct operator precedence when parsing expressions (#190).
  • Fix "math domain error" in mapping (#111, #151).