# Source code for mitiq.interface.mitiq_pyquil.conversions

```
# Copyright (C) 2020 Unitary Fund
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <https://www.gnu.org/licenses/>.
"""Functions to convert between Mitiq's internal circuit representation and
pyQuil's circuit representation (Quil programs).
"""
from cirq import Circuit, LineQubit
from pyquil import Program
from cirq.contrib.quil_import import circuit_from_quil
QuilType = str
[docs]def to_quil(circuit: Circuit) -> QuilType:
"""Returns a Quil string representing the input Mitiq circuit.
Args:
circuit: Mitiq circuit to convert to a Quil string.
Returns:
QuilType: Quil string equivalent to the input Mitiq circuit.
"""
max_qubit = max(circuit.all_qubits())
# if we are using LineQubits, keep the qubit labeling the same
if isinstance(max_qubit, LineQubit):
qubit_range = max_qubit.x + 1
return circuit.to_quil(qubit_order=LineQubit.range(qubit_range))
# otherwise, use the default ordering (starting from zero)
return circuit.to_quil()
[docs]def to_pyquil(circuit: Circuit) -> Program:
"""Returns a pyQuil Program equivalent to the input Mitiq circuit.
Args:
circuit: Mitiq circuit to convert to a pyQuil Program.
Returns:
pyquil.Program object equivalent to the input Mitiq circuit.
"""
return Program(to_quil(circuit))
[docs]def from_pyquil(program: Program) -> Circuit:
"""Returns a Mitiq circuit equivalent to the input pyQuil Program.
Args:
program: PyQuil Program to convert to a Mitiq circuit.
Returns:
Mitiq circuit representation equivalent to the input pyQuil Program.
"""
return from_quil(program.out())
[docs]def from_quil(quil: QuilType) -> Circuit:
"""Returns a Mitiq circuit equivalent to the input Quil string.
Args:
quil: Quil string to convert to a Mitiq circuit.
Returns:
Mitiq circuit representation equivalent to the input Quil string.
"""
return circuit_from_quil(quil)
```