I am trying to solve H.F.2, and this is the code I have so far
n_bits=2
dev = qml.device("default.qubit", wires=range(n_bits))
@qml.qnode(dev)
def two_close_spins_X(alpha, beta, time, n):
"""Circuit for evolving the state of two electrons with an X coupling.
Args:
alpha (float): The coefficient related to the strength of the field, assumed to point in the z direction.
beta (float): The coefficient related to the strength of the coupling between electrons.
time (float): The time we evolve the electron wavefunction for.
n (int): The number of steps in our Trotterization.
Returns:
array[complex]: The quantum state after evolution.
"""
for _ in range(n):
qml.IsingXX(-2 * beta * time/n, wires=[0, 1])
qml.RZ(-2 * alpha * time/n, wires=[0])
qml.RZ(-2 * alpha * time/n, wires=[1])
return qml.state()
I am getting the error Incorrect: your circuit isn't giving the right answers.
Any suggestions?
I already checked the earlier discussion Stuck with H.5.2 but looks like the expected code has changed slightly.