def test_use_modes(self):
qubit = Transmon("qubit", levels=3, kerr=-200e-3)
cavity = Cavity("cavity", levels=10, kerr=-10e-6)
system = System("system", modes=[qubit, cavity])
with system.use_modes([qubit]):
self.assertEqual(system.ground_state(), qubit.fock(0, full_space=False))
with system.use_modes([cavity]):
self.assertEqual(system.ground_state(), cavity.fock(0, full_space=False))
with system.use_modes([qubit, cavity]):
self.assertEqual(
system.ground_state(),
qutip.tensor(
qubit.fock(0, full_space=False), cavity.fock(0, full_space=False)
),
)
system.order_modes = False
with system.use_modes([cavity, qubit]):
self.assertEqual(
system.ground_state(),
qutip.tensor(
cavity.fock(0, full_space=False), qubit.fock(0, full_space=False)
),
)
def test_rabi_two_levels(self):
qubit = Transmon("qubit", levels=2)
system = System("system", modes=[qubit])
for _ in range(2):
_, old_amp, new_amp = tune_rabi(system, qubit.fock(0))
self.assertLess(abs(old_amp - new_amp), 1e-7)
init = qubit.fock(0)
seq = get_sequence(system)
qubit.rotate_x(np.pi)
result = seq.run(init)
target = qubit.Rx(np.pi) * init
fidelity = qutip.fidelity(result.states[-1], target)**2
self.assertLess(abs(1 - fidelity), 1e-10)
def setUpClass(cls):
qubit = Transmon("qubit", levels=2)
cavity = Cavity("cavity", levels=6)
system = System("system", modes=[qubit, cavity])
system.set_cross_kerr(qubit, cavity, -2e-3)
with system.use_modes([qubit]):
_ = tune_rabi(system, init_state=qubit.fock(0), verify=False)
cls.system = system
def test_drag(self):
qubit = Transmon("qubit", levels=3, kerr=-200e-3)
qubit.gaussian_pulse.sigma = 10
system = System("system", modes=[qubit])
for _ in range(3):
_, old_amp, new_amp = tune_rabi(system,
qubit.fock(0),
plot=False,
verify=False)
self.assertLess(abs(old_amp - new_amp), 1e-7)
_, old_drag, new_drag = tune_drag(system, qubit.fock(0), update=True)
self.assertNotAlmostEqual(new_drag, 0)
init = qubit.fock(0)
seq = get_sequence(system)
qubit.rotate_x(np.pi)
result = seq.run(init)
target = qubit.Rx(np.pi) * init
fidelity = qutip.fidelity(result.states[-1], target)**2
self.assertLess(abs(1 - fidelity), 1e-5)