Source code for pennylane_cirq.pasqal_device

# Copyright 2018 Xanadu Quantum Technologies Inc.

# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
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#     http://www.apache.org/licenses/LICENSE-2.0

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# pylint: disable=too-many-arguments
"""
This module provides the ``PasqalDevice`` from Cirq.
"""
from cirq import pasqal

from .simulator_device import SimulatorDevice


[docs]class PasqalDevice(SimulatorDevice): r"""Cirq Pasqal device for PennyLane. Args: wires (int): the number of wires to initialize the device with control_radius (float): The maximum distance between qubits for a controlled gate. Distance is measured in units of the ``ThreeDGridQubit`` indices. shots (int): Number of circuit evaluations/random samples used to estimate expectation values of observables. Shots need to be >= 1. If ``None``, expecation values are calculated analytically. qubits (List[cirq.ThreeDGridQubit]): A list of Cirq ThreeDGridQubits that are used as wires. If not specified, the ThreeDGridQubits are put in a linear arrangement along the first coordinate axis, separated by a distance of ``control_radius / 2``. i.e., ``(0,0,0), (control_radius/2,0,0), (control_radius,0,0)``, etc. """ name = "Cirq Pasqal device for PennyLane" short_name = "cirq.pasqal" def __init__(self, wires, control_radius, shots=None, qubits=None): if not qubits: qubits = [pasqal.ThreeDQubit(wire * control_radius / 2, 0, 0) for wire in range(wires)] self.control_radius = float(control_radius) if self.control_radius < 0: raise ValueError("The control_radius must be a non-negative real number.") super().__init__(wires, shots, qubits) self.cirq_device = pasqal.PasqalVirtualDevice(self.control_radius, qubits)