# Copyright (C) 2023 qBraid
#
# This file is part of the qBraid-SDK
#
# The qBraid-SDK is free software released under the GNU General Public License v3
# or later. You can redistribute and/or modify it under the terms of the GPL v3.
# See the LICENSE file in the project root or <https://www.gnu.org/licenses/gpl-3.0.html>.
#
# THERE IS NO WARRANTY for the qBraid-SDK, as per Section 15 of the GPL v3.
"""
Module containing functions to convert between Cirq's circuit
representation and pyQuil's circuit representation (Quil programs).
"""
from typing import TYPE_CHECKING
from pyquil import Program
from qbraid.transpiler.exceptions import CircuitConversionError
if TYPE_CHECKING:
import cirq.circuits
import pyquil.quil
[docs]
def cirq_to_pyquil(circuit: "cirq.circuits.Circuit") -> "pyquil.quil.Program":
"""Returns a pyQuil Program equivalent to the input Cirq circuit.
Args:
circuit: Cirq circuit to convert to a pyQuil Program.
Returns:
pyquil.Program object equivalent to the input Cirq circuit.
"""
# pylint: disable=import-outside-toplevel
from cirq import LineQubit, QubitOrder
from .cirq_quil_output import QuilOutput
# pylint: enable=import-outside-toplevel
input_qubits = circuit.all_qubits()
max_qubit = max(input_qubits)
# if we are using LineQubits, keep the qubit labeling the same
if isinstance(max_qubit, LineQubit):
qubit_range = max_qubit.x + 1
qubit_order = LineQubit.range(qubit_range)
# otherwise, use the default ordering (starting from zero)
else:
qubit_order = QubitOrder.DEFAULT
qubits = QubitOrder.as_qubit_order(qubit_order).order_for(input_qubits)
operations = circuit.all_operations()
try:
quil_str = str(QuilOutput(operations, qubits))
return Program(quil_str)
except ValueError as err:
raise CircuitConversionError(
f"Cirq qasm converter doesn't yet support {err.args[0][32:]}."
) from err
[docs]
def pyquil_to_cirq(program: "pyquil.quil.Program") -> "cirq.circuits.Circuit":
"""Returns a Cirq circuit equivalent to the input pyQuil Program.
Args:
program: PyQuil Program to convert to a Cirq circuit.
Returns:
Cirq circuit representation equivalent to the input pyQuil Program.
"""
# pylint: disable-next=import-outside-toplevel
from .cirq_quil_input import circuit_from_quil
try:
return circuit_from_quil(program.out())
except Exception as err:
raise CircuitConversionError(
"qBraid transpiler doesn't yet support pyQuil noise gates."
) from err