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added release notes for controlled gate class (#2862). #3465

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merged 9 commits into from
Nov 30, 2019
Merged

added release notes for controlled gate class (#2862). #3465

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2283a67
added release notes for controlled gate class (#2862).
ewinston Nov 13, 2019
b5e0bae
remove pylint disable
ajavadia Nov 14, 2019
5602c1a
remove one more unused import
ajavadia Nov 14, 2019
28b1626
change q_if to control
ewinston Nov 14, 2019
9d18d60
Merge branch 'master' into cgate_unused_imports
ewinston Nov 14, 2019
a4805a5
Merge branch 'master' into cgate_unused_imports
ewinston Nov 19, 2019
8fa3df1
Merge branch 'master' into cgate_unused_imports
ewinston Nov 26, 2019
bf8e069
update release notes
ewinston Nov 26, 2019
95474e3
Merge branch 'master' into cgate_unused_imports
mergify[bot] Nov 30, 2019
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27 changes: 27 additions & 0 deletions releasenotes/notes/add_ControlledGate_class-010c5c90f8f95e78.yaml
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Original file line number Diff line number Diff line change
@@ -0,0 +1,27 @@
---
features:
- |
Add ``ControlledGate`` class for representing controlled
gates. Controlled gate instances are created with the
``q_if(n)`` method of ``Gate`` objects where ``n`` represents
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the number of controls. The control qubits come before the
controlled qubits in the new gate. For example::

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hgate = HGate()
circ = QuantumCircuit(4)
circ.append(hgate.q_if(3), [0, 1, 2, 3])
print(circ)

generates::

q_0: |0>──■──
│
q_1: |0>──■──
│
q_2: |0>──■──
┌─┴─┐
q_3: |0>┤ H ├
└───┘



15 changes: 4 additions & 11 deletions test/python/circuit/test_controlled_gate.py
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Expand Up @@ -12,23 +12,16 @@
# copyright notice, and modified files need to carry a notice indicating
# that they have been altered from the originals.

# pylint: disable=unused-import

"""Test Qiskit's inverse gate operation."""

import os
import tempfile
import unittest
from math import pi
from inspect import signature
import numpy as np
from numpy import pi
from ddt import ddt, data

from qiskit import (QuantumRegister, ClassicalRegister, QuantumCircuit, execute,
BasicAer)
from qiskit import QuantumRegister, QuantumCircuit, execute, BasicAer
from qiskit.test import QiskitTestCase
from qiskit.circuit import ControlledGate
from qiskit.compiler import transpile
from qiskit.quantum_info.operators.predicates import matrix_equal, is_unitary_matrix
import qiskit.circuit.add_control as ac
from qiskit.transpiler.passes import Unroller
Expand Down Expand Up @@ -120,7 +113,7 @@ def test_multi_controlled_composite_gate(self):
sub_q = QuantumRegister(2)
cgate = QuantumCircuit(sub_q, name='cgate')
cgate.h(sub_q[0])
cgate.crz(np.pi/2, sub_q[0], sub_q[1])
cgate.crz(pi/2, sub_q[0], sub_q[1])
cgate.swap(sub_q[0], sub_q[1])
cgate.u3(0.1, 0.2, 0.3, sub_q[1])
cgate.t(sub_q[0])
Expand Down Expand Up @@ -357,7 +350,7 @@ def test_inverse_circuit(self, num_ctrl_qubits):
qc.h(0)
qc.cx(0, 1)
qc.cx(1, 2)
qc.rx(np.pi/4, [0, 1, 2])
qc.rx(pi/4, [0, 1, 2])
gate = instruction_to_gate(qc.to_instruction())
cgate = gate.q_if(num_ctrl_qubits)
inv_cgate = cgate.inverse()
Expand Down