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Add iSWAP and CPhase gates #45

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merged 5 commits into from
Nov 3, 2020
Merged

Add iSWAP and CPhase gates #45

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ac8eb05
Add iSWAP and CPhase
thisac Oct 30, 2020
044d8c4
Add empty line
thisac Oct 30, 2020
b66bc11
Add tests
thisac Nov 3, 2020
e9438fa
Fix latex math
thisac Nov 3, 2020
09fd066
Fix tests
thisac Nov 3, 2020
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10 changes: 5 additions & 5 deletions pennylane_cirq/ops.py
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Original file line number Diff line number Diff line change
Expand Up @@ -148,11 +148,11 @@ class CPhase(Operation):

CPhase(\phi) =
\begin{bmatrix}
[[1, 0, 0, 0],
[0, 1, 0, 0],
[0, 0, 1, 0],
[0, 0, 0, e^{i\phi]]
\end{bmatrix}.
1 & 0 & 0 & 0\\
0 & 1 & 0 & 0\\
0 & 0 & 1 & 0\\
0 & 0 & 0 & e^{i\phi}
\end{bmatrix}

See the `Cirq docs <https://cirq.readthedocs.io/en/stable/generated/cirq.CZPowGate.html>`_
for further details."""
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28 changes: 16 additions & 12 deletions tests/test_native_ops.py
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Expand Up @@ -191,22 +191,24 @@ def test_apply_amplitude_damp_single_wire(

@pytest.mark.parametrize("input",
[
[1, 0, 0, 0],
[0, 1, 0, 0],
[0, 0, 1, 0],
[0, 0, 0, 1],
np.array([1, 0, 0, 0]),
np.array([2, 1, 0, 1]) / np.sqrt(6),
np.array([0, 0, 1, 0]),
np.array([0, 1, 0, 1]) / np.sqrt(2),
np.array([0, 0, 0, 1]),
np.array([2, 1, 2, 1]) / np.sqrt(10),
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💯

]
)
def test_apply_iswap(self, tol, input, shots, analytic):
"""Tests that applying the CPhase gate yields the expected output."""
"""Tests that applying the iSWAP gate yields the expected output."""
device = SimulatorDevice(2, shots=shots, analytic=analytic)

iswap_mat = np.array([[1, 0, 0, 0],
[0, 0, 1j, 0],
[0, 1j, 0, 0],
[0, 0, 0, 1]])

expected = input @ iswap_mat
expected = iswap_mat @ input

device.reset()
device._initial_state = np.array(input, dtype=np.complex64)
Expand All @@ -217,22 +219,24 @@ def test_apply_iswap(self, tol, input, shots, analytic):
@pytest.mark.parametrize("par", [0, 0.5, 1.42, np.pi/4, np.pi/2, np.pi])
@pytest.mark.parametrize("input",
[
[1, 0, 0, 0],
[0, 1, 0, 0],
[0, 0, 1, 0],
[0, 0, 0, 1],
np.array([1, 0, 0, 0]),
np.array([2, 1, 0, 1]) / np.sqrt(6),
np.array([0, 0, 1, 0]),
np.array([0, 1, 0, 1]) / np.sqrt(2),
np.array([0, 0, 0, 1]),
np.array([2, 1, 2, 1]) / np.sqrt(10),
]
)
def test_apply_cphase(self, tol, par, input, shots, analytic):
"""Tests that applying the iSWAP gate yields the expected output."""
"""Tests that applying the CPhase gate yields the expected output."""
device = SimulatorDevice(2, shots=shots, analytic=analytic)

cphase_mat = np.array([[1, 0, 0, 0],
[0, 1, 0, 0],
[0, 0, 1, 0],
[0, 0, 0, np.exp(1j * par)]])

expected = input @ cphase_mat
expected = cphase_mat @ input

device.reset()
device._initial_state = np.array(input, dtype=np.complex64)
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