1""" Module providing Translation between different universal quantum computers """
 2from typing import Any
 3from abc import ABC, abstractmethod
 4
 5import qiskit
 6from qiskit import qasm2
 7from qiskit.compiler import transpile
 8from qiskit.transpiler.passes import RemoveBarriers
 9
10from quantum_launcher.exceptions import DependencyError
11try:
12    import cirq
13    from cirq.contrib.qasm_import.qasm import circuit_from_qasm
14except ImportError as e:
15    raise DependencyError(e, 'cirq') from e
16
17

[docs]
18class Translation(ABC):
19    """ Translation layer for circuits written in different languages """
20    basis_gates: list[str] = []
21    language: str = 'None'
22    circuit_object: type = type
23    language_name_mapping: dict[str, "Translation"] = {}
24    circuit_class_mapping: dict[type, "Translation"] = {}
25
26    def __init_subclass__(cls):
27        Translation.language_name_mapping[cls.language] = cls()
28        Translation.circuit_class_mapping[cls.circuit_object] = cls()
29

[docs]
30    @abstractmethod
31    def to_qasm(self, circuit: Any) -> str:
32        """ Translation from given circuit into qasm (as a string) """

33

[docs]
34    @abstractmethod
35    def from_qasm(self, qasm: str) -> Any:
36        """ Translation given in qasm (as a string) circuit into language specific object """

37

[docs]
38    @staticmethod
39    def get_translation(circuit: Any, language: str) -> Any:
40        """ Transpiles circuit into given languages basis_gates, translates it to qasm, and from qasm into desired languages object. """
41        circuit_qasm_translator = Translation.circuit_class_mapping[circuit.__class__]
42        qasm_circuit_translator = Translation.language_name_mapping[language]
43        if isinstance(circuit, qiskit.QuantumCircuit):
44            transpiled_circuit = transpile_circuit(circuit, qasm_circuit_translator.basis_gates)
45        else:
46            transpiled_circuit = circuit  # Transpilation is usually not needed
47        qasm = circuit_qasm_translator.to_qasm(transpiled_circuit)
48        return qasm_circuit_translator.from_qasm(qasm)


49
50

[docs]
51class CirqTranslation(Translation):
52    """ Translation class for Cirq """
53    basis_gates = ['x', 'y', 'z', 'cx', 'h', 'rx', 'ry', 'rz']
54    language: str = 'cirq'
55    circuit_object = cirq.Circuit
56

[docs]
57    def to_qasm(self, circuit: cirq.Circuit) -> str:
58        return circuit.to_qasm()

59

[docs]
60    def from_qasm(self, qasm: str) -> cirq.Circuit:
61        return circuit_from_qasm(qasm)


62
63

[docs]
64class QiskitTranslation(Translation):
65    """ Translation class for Qiskit """
66    basis_gates = ['x', 'y', 'z', 'cx', 'h', 'rx', 'ry', 'rz', 'u']
67    language: str = 'qiskit'
68    circuit_object = qiskit.QuantumCircuit
69

[docs]
70    def to_qasm(self, circuit: qiskit.QuantumCircuit) -> str:
71        return qasm2.dumps(circuit)

72

[docs]
73    def from_qasm(self, qasm: str) -> qiskit.QuantumCircuit:
74        return qiskit.QuantumCircuit.from_qasm_str(qasm)


75
76

[docs]
77def transpile_circuit(qc: qiskit.QuantumCircuit, basis_gates: list[str]) -> qiskit.QuantumCircuit:
78    """Makes circuit compatible with cirq
79
80    Args:
81        qc (qiskit.QuantumCircuit): circuit
82
83    Returns:
84        qiskit.QuantumCircuit: transpiled circuit
85    """
86    qc_transpiled = transpile(
87        qc,
88        basis_gates=basis_gates,
89        optimization_level=3
90    )
91
92    return RemoveBarriers()(qc_transpiled)