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Add CSWAP gate #1803

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19 changes: 19 additions & 0 deletions src/qibo/backends/npmatrices.py
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Original file line number Diff line number Diff line change
Expand Up @@ -257,6 +257,25 @@ def SWAP(self):
[[1, 0, 0, 0], [0, 0, 1, 0], [0, 1, 0, 0], [0, 0, 0, 1]], dtype=self.dtype
)

@cached_property
def CSWAP(self):
return self._cast(
[
[1, 0, 0, 0, 0, 0, 0, 0],
[0, 1, 0, 0, 0, 0, 0, 0],
[0, 0, 1, 0, 0, 0, 0, 0],
[0, 0, 0, 1, 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, 1, 0, 0],
[0, 0, 0, 0, 0, 0, 0, 1],
],
dtype=self.dtype,
)
# return self._cast(
# [[1, 0, 0, 0], [0, 0, 1, 0], [0, 1, 0, 0], [0, 0, 0, 1]], dtype=self.dtype
# )

@cached_property
def iSWAP(self):
return self._cast(
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45 changes: 45 additions & 0 deletions src/qibo/gates/gates.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1686,6 +1686,51 @@ def qasm_label(self) -> str:
return "swap"


class CSWAP(Gate):
"""The controlled-SWAP gate.

Corresponds to the following unitary matrix

.. math::
\\begin{pmatrix}
1 & 0 & 0 & 0 & 0 & 0 & 0 & 0 \\\\
0 & 1 & 0 & 0 & 0 & 0 & 0 & 0 \\\\
0 & 0 & 1 & 0 & 0 & 0 & 0 & 0 \\\\
0 & 0 & 0 & 1 & 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 & 1 & 0 & 0 \\\\
0 & 0 & 0 & 0 & 0 & 0 & 0 & 1 \\\\
\\end{pmatrix}

Args:
q0 (int): the control qubit id number.
q1 (int): the first target qubit id number.
q2 (int): the second target qubit id number.
"""

def __init__(self, q0: int, q1: int, q2: int):
super().__init__()
self.name = "cswap"
self.draw_label = "x"
self.control_qubits = (q0,)
self.target_qubits = (q1, q2)
self.init_args = [q0, q1, q2]
self.unitary = True

@property
def clifford(self) -> bool:
return False

@property
def hamming_weight(self) -> bool:
return True

@property
def qasm_label(self) -> str:
return "cswap"


class iSWAP(Gate):
"""The iSWAP gate.

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