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It's in the set of commuters I think

master
Pete Shadbolt 8 anni fa
parent
commit
17f24fba09
2 ha cambiato i file con 27 aggiunte e 10 eliminazioni
  1. +26
    -9
      abp/clifford.py
  2. +1
    -1
      tests/test_clifford.py

+ 26
- 9
abp/clifford.py Vedi File

@@ -41,7 +41,7 @@ def normalize_global_phase(m):
return rot * m if rot * v > 0 else -rot * m


def find_cz(bond, c1, c2, commuters, state_table):
def find_cz(bond, c1, c2, commuters, state_table, ab_cz_table):
""" Find the output of a CZ operation """
# Figure out the target state
target = qi.cz.dot(state_table[bond, c1, c2])
@@ -52,12 +52,23 @@ def find_cz(bond, c1, c2, commuters, state_table):
s2 = commuters if c2 in commuters else xrange(24)

# Find a match
for bond, c1p, c2p in it.product([0, 1], s1, s2):
if np.allclose(target, state_table[bond, c1p, c2p]):
return bond, c1p, c2p
options = set()
for bondp, c1p, c2p in it.product([0, 1], s1, s2):
if np.allclose(target, state_table[bondp, c1p, c2p]):
options.add((bondp, c1p, c2p))

#assert tuple(ab_cz_table[bond, c1, c2]) in options
if not tuple(ab_cz_table[bond, c1, c2]) in options:
assert len(s1)==5 or len(s2)==5
#print len(s1), len(s2)
#print bond, c1, c2
#print ab_cz_table[bond, c2, c2]
#print " ".join(map(str, options))
#raise AssertionError
return options.pop()

# Didn't find anything - this should never happen
raise IndexError
#raise IndexError


def compose_u(decomposition):
@@ -100,27 +111,33 @@ def get_state_table(unitaries):
np.dot(kp, state).T)
return state_table


def get_commuters(unitaries):
""" Get the indeces of gates which commute with CZ """
commuters = (qi.id, qi.px, qi.pz, qi.ph, qi.hermitian_conjugate(qi.ph))
return [find_clifford(u, unitaries) for u in commuters]


def get_cz_table(unitaries):
""" Compute the lookup table for the CZ (A&B eq. 9) """
# Get a cached state table and a list of gates which commute with CZ
commuters = get_commuters(unitaries)
state_table = get_state_table(unitaries)
ab_cz_table = get_ab_cz_table()

# And now build the CZ table
cz_table = np.zeros((2, 24, 24, 3), dtype=int)
rows = list(it.product([0, 1], it.combinations_with_replacement(range(24), 2)))
rows = list(
it.product([0, 1], it.combinations_with_replacement(range(24), 2)))
# CZ is symmetric so we only need combinations
for bond, (c1, c2) in tqdm(rows, desc="Building CZ table"):
newbond, c1p, c2p = find_cz(bond, c1, c2, commuters, state_table)
newbond, c1p, c2p = find_cz(
bond, c1, c2, commuters, state_table, ab_cz_table)
cz_table[bond, c1, c2] = [newbond, c1p, c2p]
cz_table[bond, c2, c1] = [newbond, c2p, c1p]
return cz_table


def get_ab_cz_table():
""" Load anders and briegel's CZ table """
filename = "anders_briegel/cphase.tbl"
@@ -137,7 +154,7 @@ try:
unitaries = np.load("unitaries.npy")
conjugation_table = np.load("conjugation_table.npy")
times_table = np.load("times_table.npy")
#cz_table = np.load("cz_table.npy")
# cz_table = np.load("cz_table.npy")
cz_table = get_ab_cz_table()

with open("by_name.json") as f:
@@ -151,7 +168,7 @@ except IOError:
conjugation_table = get_conjugation_table(unitaries)
times_table = get_times_table(unitaries)
cz_table = get_cz_table(unitaries)
# Write it all to disk
np.save("unitaries.npy", unitaries)
np.save("conjugation_table.npy", conjugation_table)


+ 1
- 1
tests/test_clifford.py Vedi File

@@ -67,7 +67,7 @@ def test_times_table():
assert clifford.times_table[0][4] == 4


def _test_cz_table_is_symmetric():
def test_cz_table_is_symmetric():
""" Test the CZ table is symmetric """
for bond, (a, b) in it.product([0, 1], it.combinations(xrange(24), 2)):
_, a1, a2 = clifford.cz_table[bond, a, b]


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