# Copyright (C) 2024 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 typing import TYPE_CHECKING
from qbraid_core._import import LazyLoader
from qbraid.passes.qasm3.compat import (
convert_qasm_pi_to_decimal,
remove_stdgates_include,
replace_gate_name,
)
from qbraid.programs import QasmError
from qbraid.transpiler.annotations import weight
braket_circuits = LazyLoader("braket_circuits", globals(), "braket.circuits")
braket_openqasm = LazyLoader("braket_openqasm", globals(), "braket.ir.openqasm")
if TYPE_CHECKING:
import braket.circuits
def transform_notation(qasm3: str) -> str:
"""
Process an OpenQASM 3 program that was generated by
an external tool to make it compatible with Amazon Braket.
"""
replacements = {
"cx": "cnot",
"sdg": "si",
"tdg": "ti",
"sx": "v",
"sxdg": "vi",
"p": "phaseshift",
"cp": "cphaseshift",
}
qasm3 = remove_stdgates_include(qasm3)
for old, new in replacements.items():
qasm3 = replace_gate_name(qasm3, old, new)
qasm3 = convert_qasm_pi_to_decimal(qasm3)
return qasm3
[docs]
@weight(1)
def qasm3_to_braket(qasm3_str: str) -> "braket.circuits.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
"""
qasm3_str = transform_notation(qasm3_str)
try:
program = braket_openqasm.Program(source=qasm3_str)
return braket_circuits.Circuit.from_ir(source=program.source, inputs=program.inputs)
except Exception as err:
raise QasmError("Error converting qasm3 string to braket circuit") from err