# 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 for converting Braket circuits to/from OpenQASM 3
"""
from braket.circuits import Circuit
from braket.circuits.serialization import IRType
from braket.ir.openqasm import Program as OpenQasmProgram
from qbraid.programs import QasmError, convert_qasm_pi_to_decimal
QASMType = str
[docs]
def qasm3_to_braket(qasm3_str: QASMType) -> Circuit:
"""Converts an OpenQASM 3.0 string to a ``braket.circuits.Circuit``.
Args:
qasm3_str: OpenQASM 3 string
Returns:
The Amazon Braket circuit equivalent to the input OpenQASM 3.0 string
Raises:
CircuitConversionError: If qasm to braket conversion fails
"""
replacements = {
"cx ": "cnot ",
"sdg ": "si ",
"tdg ": "ti ",
"sx ": "v ",
"sxdg ": "vi ",
"p(": "phaseshift(",
"cp(": "cphaseshift(",
}
def replace_commands(qasm, replacements):
for old, new in replacements.items():
qasm = qasm.replace(old, new)
return qasm
qasm3_str = qasm3_str.replace('include "stdgates.inc";', "")
qasm3_str = replace_commands(qasm3_str, replacements)
qasm3_str = convert_qasm_pi_to_decimal(qasm3_str)
try:
program = OpenQasmProgram(source=qasm3_str)
return Circuit.from_ir(source=program.source, inputs=program.inputs)
except Exception as err:
raise QasmError("Error converting qasm3 string to braket circuit") from err
[docs]
def braket_to_qasm3(circuit: Circuit) -> QASMType:
"""Converts a ``braket.circuits.Circuit`` to an OpenQASM 3.0 string.
Args:
circuit: Amazon Braket quantum circuit
Returns:
The OpenQASM 3.0 string equivalent to the circuit
Raises:
CircuitConversionError: If braket to qasm conversion fails
"""
try:
return circuit.to_ir(IRType.OPENQASM).source
except Exception as err:
raise QasmError("Error converting braket circuit to qasm3 string") from err