Remove underscore from quantum_info, providers (#2060)

* Remove underscore from basicaertools

* Remove underscore from quantum_info

qiskit/providers/basicaer/qasm_simulator.py

@@ -38,9 +38,9 @@
 from qiskit.providers import BaseBackend
 from qiskit.providers.basicaer.basicaerjob import BasicAerJob
 from .exceptions import BasicAerError
-from ._basicaertools import single_gate_matrix
-from ._basicaertools import cx_gate_matrix
-from ._basicaertools import einsum_vecmul_index
+from .basicaertools import single_gate_matrix
+from .basicaertools import cx_gate_matrix
+from .basicaertools import einsum_vecmul_index
 
 logger = logging.getLogger(__name__)
 

qiskit/providers/basicaer/unitary_simulator.py

@@ -32,9 +32,9 @@
 from qiskit.providers.basicaer.basicaerjob import BasicAerJob
 from qiskit.result import Result
 from .exceptions import BasicAerError
-from ._basicaertools import single_gate_matrix
-from ._basicaertools import cx_gate_matrix
-from ._basicaertools import einsum_matmul_index
+from .basicaertools import single_gate_matrix
+from .basicaertools import cx_gate_matrix
+from .basicaertools import einsum_matmul_index
 
 logger = logging.getLogger(__name__)
 

qiskit/quantum_info/__init__.py

@@ -9,6 +9,6 @@
 
 from .operators.pauli import Pauli, pauli_group
 from .operators.channel import Choi, SuperOp, Kraus, Stinespring, Chi, PTM
-from .states._states import basis_state, random_state, projector, purity
-from .states._measures import state_fidelity
-from .operators._measures import process_fidelity
+from .states.states import basis_state, random_state, projector, purity
+from .states.measures import state_fidelity
+from .operators.measures import process_fidelity