Cudaq Frontend

mitiq/interface/mitiq_cudaq/__init__.py

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+# Copyright (C) Unitary Foundation
+#
+# This source code is licensed under the GPL license (v3) found in the
+# LICENSE file in the root directory of this source tree.
+
+from mitiq.interface.mitiq_cudaq.conversions import (
+    from_cudaq,
+    to_cudaq,
+)

mitiq/interface/mitiq_cudaq/conversions.py

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+# Copyright (C) Unitary Foundation
+#
+# This source code is licensed under the GPL license (v3) found in the
+# LICENSE file in the root directory of this source tree.
+
+"""Functions to convert between Mitiq's internal circuit representation and
+Cuda-Quantum's circuit representation.
+"""
+
+from cirq import Circuit
+from cudaq import PyKernel
+from qbraid.transpiler.conversions.cirq import cirq_to_qasm2
+from qbraid.transpiler.conversions.cudaq import cudaq_to_qasm2
+from qbraid.transpiler.conversions.openqasm3 import openqasm3_to_cudaq
+from qbraid.transpiler.conversions.qasm2 import qasm2_to_cirq, qasm2_to_qiskit
+from qbraid.transpiler.conversions.qasm3 import qasm3_to_openqasm3
+from qbraid.transpiler.conversions.qiskit import qiskit_to_qasm3
+
+
+def from_cudaq(kernel: PyKernel) -> Circuit:
+    """Convert a cudaq PyKernel to a cirq Circuit via OpenQASM 3.
+
+    Args:
+        kernel (PyKernel): The cudaq PyKernel to convert.
+
+    Returns:
+        Circuit: The converted cirq Circuit.
+    """
+    qasm2_str = cudaq_to_qasm2(kernel)
+    return qasm2_to_cirq(qasm2_str)
+
+
+def to_cudaq(circuit: Circuit) -> PyKernel:
+    """Convert a cirq Circuit to a cudaq PyKernel via OpenQASM 3.
+
+    Args:
+        circuit (Circuit): The cirq Circuit to convert.
+
+    Returns:
+        PyKernel: The converted cudaq PyKernel.
+    """
+    from qiskit import transpile
+
+    qasm2_str = cirq_to_qasm2(circuit)
+    qiskit_qc = qasm2_to_qiskit(qasm2_str)
+    # We need to transpile as `openqasm3_to_cudaq` cannot work
+    # with arbitrary gates, i.e., ccx, rxx, etc.
+    qiskit_qc = transpile(qiskit_qc, basis_gates=["u3", "cx"])
+    qasm3_str = qiskit_to_qasm3(qiskit_qc)
+    openqasm3_str = qasm3_to_openqasm3(qasm3_str)
+    cudaq_qc = openqasm3_to_cudaq(openqasm3_str)
+
+    return cudaq_qc