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# Copyright © 2022-2023 University of Strasbourg. All Rights Reserved.
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# Licensed under the Apache License, Version 2.0 (the "License");
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# http://www.apache.org/licenses/LICENSE-2.0
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import mimiqcircuits.operations.control as mctrl
from mimiqcircuits.operations.gates.standard.swap import GateSWAP
from mimiqcircuits.operations.gates.standard.cpauli import GateCX
from mimiqcircuits.operations.gates.standard.cnx import GateCCX
[docs]
class GateCSWAP(mctrl.Control):
r"""Three qubit Controlled-SWAP gate.
By convention, the first qubit is the control and last two are the
targets.
Examples:
>>> from mimiqcircuits import *
>>> GateCSWAP(), GateCSWAP().num_controls, GateCSWAP().num_targets, GateCSWAP().num_qubits
(CSWAP, 1, 2, 3)
>>> GateCSWAP().matrix()
[1.0, 0, 0, 0, 0, 0, 0, 0]
[0, 1.0, 0, 0, 0, 0, 0, 0]
[0, 0, 1.0, 0, 0, 0, 0, 0]
[0, 0, 0, 1.0, 0, 0, 0, 0]
[0, 0, 0, 0, 1.0, 0, 0, 0]
[0, 0, 0, 0, 0, 0, 1.0, 0]
[0, 0, 0, 0, 0, 1.0, 0, 0]
[0, 0, 0, 0, 0, 0, 0, 1.0]
<BLANKLINE>
>>> c = Circuit().push(GateCSWAP(), 0, 1, 2)
>>> GateCSWAP().power(2), GateCSWAP().inverse()
(C(Parallel(2, ID)), CSWAP)
>>> c = Circuit().push(GateCSWAP(), 0, 1, 2)
>>> c
3-qubit circuit with 1 instructions:
└── CSWAP @ q[0], q[1,2]
<BLANKLINE>
>>> GateCSWAP().power(2), GateCSWAP().inverse()
(C(Parallel(2, ID)), CSWAP)
>>> GateCSWAP().decompose()
3-qubit circuit with 3 instructions:
├── CX @ q[2], q[1]
├── C₂X @ q[0,1], q[2]
└── CX @ q[2], q[1]
<BLANKLINE>
"""
def __init__(self):
super().__init__(1, GateSWAP())
def _decompose(self, circ, qubits, bits):
c, t1, t2 = qubits
circ.push(GateCX(), t2, t1)
circ.push(GateCCX(), c, t1, t2)
circ.push(GateCX(), t2, t1)
return circ
