|
- import qi
- import numpy as np
- import tables
- from tqdm import tqdm
- import itertools as it
-
- def get_krontable():
- table = np.zeros((24,24,4,4), dtype=complex)
- for i, j in it.product(range(24), range(24)):
- u1 = tables.unitaries[i]
- u2 = tables.unitaries[j]
- table[i, j, :, :] = np.kron(u1, u2)
- return table
-
- def find(bond, c1, c2, z, krontable):
- # Figure out the target state
- state = qi.bond if bond else qi.nobond
- target = qi.cz * krontable[c1, c2] * state
-
- # Choose the sets to search over
- s1 = z if c1 in z else xrange(24)
- s2 = z if c2 in z else xrange(24)
-
- for bond, c1p, c2p in it.product([0,1], s1, s2):
- state = qi.bond if bond else qi.nobond
- trial = krontable[c1p, c2p] * state
- for phase in range(8):
- if np.allclose(target, np.exp(1j * phase * np.pi / 4.) * trial):
- return bond, c1p, c2p
-
- raise IndexError
-
-
- z = [tables.find(u, tables.unitaries) for u in qi.id, qi.px, qi.pz, qi.ph, qi.ph.H]
- krontable = get_krontable()
-
- cz_table = np.zeros((2, 24, 24, 3))
- for bond, c1, c2 in tqdm(list(it.product([0,1], range(24), range(24)))):
- cz_table[bond, c1, c2] = find(bond, c1, c2, z, krontable)
-
- np.save("cz_table.npy", cz_table)
|
