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QECWrappernew.py
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QECWrappernew.py
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import stim
import sys
from scipy.optimize import linear_sum_assignment
class Qubit(object):
def __init__(self, x, y, ind):
self.x = x
self.y = y
self.ind = ind
self.processed = False
self.isancilla = False
self.type = "NA"
def getind(self):
return self.ind
def isprocessed(self):
return self.processed
def setprocessed(self):
self.processed = True
def setancilla(self, t):
self.isancilla = True
self.type = t
def gety(self):
return self.y
def getx(self):
return self.x
def printme(self, pref=""):
print(F'{pref} {self.x} {self.y} {self.ind} {self.processed}')
class Vertex(object):
def __init__(self, x, y):
self.x = x
self.y = y
def addqbitinds(self, qbitinds):
self.qubitinds = qbitinds
def getqbitinds(self):
return self.qubitinds
def getx(self):
return self.x
def gety(self):
return self.y
def addancillaqbitind(self, ind):
self.ancillaqbitind = ind
def getancillaind(self):
return self.ancillaqbitind
def printme(self, pref=""):
print(F'{pref} {self.x} {self.y}')
class Plaquette(object):
def __init__(self, locx, locy):
self.qubitinds = []
self.x = locx
self.y = locy
def addqbitinds(self, qbitinds):
self.qubitinds = qbitinds
def addancillaqbitind(self, ind):
self.ancillaqbitind = ind
def getancillaind(self):
return self.ancillaqbitind
def getqbitinds(self):
return self.qubitinds
def printme(self, pref=""):
print(F'{pref} {self.x} {self.y}')
def getx(self):
return self.x
def gety(self):
return self.y
class Topology(object):
def __init__(self, k, r, c):
self.nplaquettes = k
self.rows = r
self.columns = c
self.plaquettes = {}
self.qinddict = {}
self.vertexinddict = {}
self.vertices = {}
self.qubits = {}
self.ancillaqubits = {}
self.sqbitindmap = {}
self.qind = 0
self.initialized = False
self.initializetopology()
self.circuit = stim.Circuit()
def getqbits(self, i, j):
xs = [i - 1, i, i + 1, i]
ys = [j, j - 1, j, j + 1]
rqubitinds = []
for xbar, ybar in zip(xs, ys):
x = xbar
y = ybar
if xbar % (2*self.rows) == 0:
x = 0
if ybar % (2*self.columns) == 0:
y = 0
if "{}-{}".format(x, y) in self.qinddict:
rqubitinds.append(self.qinddict["{}-{}".format(x, y)])
else:
qbit = Qubit(x, y, self.qind)
self.qinddict["{}-{}".format(x,y)] = self.qind
self.qubits[self.qind] = qbit
self.sqbitindmap[self.qind] = self.qind
rqubitinds.append(self.qind)
self.qind += 1
return rqubitinds
def getvertexqbits(self, xv, yv):
xs = [xv-1, xv, xv, xv+1]
ys = [yv, yv-1, yv, yv+1]
rqubitinds = []
for xbar, ybar in zip(xs, ys):
x = xbar
y = ybar
if xbar < 0 or xbar >= (2*self.rows) :
x = 0
if ybar < 0 or ybar >= (2*self.columns):
y = 0
for qind in self.qubits:
qx = self.qubits[qind].getx()
qy = self.qubits[qind].gety()
if qx == x and qy == y:
rqubitinds.append(qind)
return rqubitinds
def initializevertices(self):
vind = 0
for i in range(self.nplaquettes):
xi = self.plaquettes[i].getx()
yi = self.plaquettes[i].gety()
xs = [xi-1,xi-1,xi+1,xi+1]
ys = [yi+1,yi-1,yi-1,yi+1]
for xbar,ybar in zip(xs,ys):
x = xbar
y = ybar
if xbar % (2*self.rows) == 0:
x = 0
if ybar % (2*self.columns) == 0:
y = 0
if "{}-{}".format(x, y) not in self.vertexinddict:
self.vertexinddict["{}-{}".format(x,y)] = vind
vertex = Vertex(x, y)
vertex.addqbitinds(self.getvertexqbits(x, y))
self.vertices[vind] = vertex
vind += 1
def initializetopology(self):
ind = 0
x = 1
y = 1
for i in range(self.rows):
for j in range(self.columns):
self.plaquettes[ind] = Plaquette(x, y)
self.plaquettes[ind].addqbitinds(self.getqbits(x, y))
ind += 1
if i % 2 == 0:
y += 2
else:
y -= 2
x += 2
if i % 2 == 0:
y = self.columns*2 - 1
else:
y = 1
self.initializevertices()
self.initialized = True
def implementcircuit(self):
if not self.initialized:
print("ERROR topology has not been initialized")
return
lines = []
for i in range(self.nplaquettes-1):
qbitinds = self.plaquettes[i].getqbitinds()
cqbitind = -1
for qi in qbitinds:
if self.qubits[qi].isprocessed() == False:
cqbitind = qi
break
qbitinds.remove(cqbitind)
self.qubits[cqbitind].setprocessed()
lines.append("H {}".format(self.sqbitindmap[cqbitind]))
self.circuit.append_operation("H", self.sqbitindmap[cqbitind])
for qi in qbitinds:
lines.append("CNOT {} {}".format(self.sqbitindmap[cqbitind], self.sqbitindmap[qi]))
self.circuit.append_operation("CNOT", [self.sqbitindmap[cqbitind], self.sqbitindmap[qi]])
self.qubits[qi].setprocessed()
def addancilla(self):
self.ancillaqubits = {}
for i in range(self.nplaquettes):
xi = self.plaquettes[i].getx()
yi = self.plaquettes[i].gety()
qbit = Qubit(xi, yi, self.qind)
qbit.setancilla("p")
self.qinddict["{}-{}".format(xi,yi)] = self.qind
self.ancillaqubits[self.qind] = qbit
self.sqbitindmap[self.qind] = self.qind
self.plaquettes[i].addancillaqbitind(self.qind)
self.qind += 1
for vind in self.vertices:
xvi = self.vertices[vind].getx()
yvi = self.vertices[vind].gety()
qbit = Qubit(xvi, yvi, self.qind)
qbit.setancilla("v")
self.qinddict["{}-{}".format(xvi,yvi)] = self.qind
self.ancillaqubits[self.qind] = qbit
self.sqbitindmap[self.qind] = self.qind
self.vertices[vind].addancillaqbitind(self.qind)
self.qind += 1
def printcircuit(self):
if not self.initialized:
print("ERROR topology has not been initialized")
return
print(self.circuit)
def addmeasurement(self):
if not self.initialized:
print("ERROR topology has not been initialized")
return
self.circuit.append_operation("MR", self.qubits.keys())
def takeameasurement(self):
if not self.initialized:
print("ERROR topology has not been initialized")
return
sample = self.circuit.compile_sampler().sample(1)[0]
print("".join(str(int(e)) for e in sample))
def addmeasurementcircuit(self):
for i in range(self.nplaquettes):
ancillaind = self.plaquettes[i].getancillaind()
self.circuit.append_operation("H", self.sqbitindmap[ancillaind])
dqbitinds = self.plaquettes[i].getqbitinds()
for dind in dqbitinds:
self.circuit.append_operation("CNOT", [self.sqbitindmap[ancillaind], self.sqbitindmap[dind]])
self.circuit.append_operation("H", self.sqbitindmap[ancillaind])
for i in self.vertices:
ancillaind = self.vertices[i].getancillaind()
#self.circuit.append_operation("H", self.sqbitindmap[ancillaind])
dqbitinds = self.vertices[i].getqbitinds()
for dind in dqbitinds:
self.circuit.append_operation("CNOT", [ self.sqbitindmap[dind], self.sqbitindmap[ancillaind]])
self.circuit.append_operation("MR", self.ancillaqubits.keys())
def addnoise(self, noise):
if not self.initialized:
print("ERROR topology has not been initialized")
return
self.circuit.append_operation("X_ERROR", self.qubits.keys(), noise)
def enablespecialindmap(self):
qinds = list(self.qubits.keys())
for i in range(len(qinds)):
for j in range(i+1,len(qinds),1):
ivalx = self.qubits[qinds[i]].getx()
jvalx = self.qubits[qinds[j]].getx()
ivaly = self.qubits[qinds[i]].gety()
jvaly = self.qubits[qinds[j]].gety()
if ivalx > jvalx:
t = qinds[i]
qinds[i] = qinds[j]
qinds[j] = t
elif ivalx == jvalx:
if ivaly > jvaly:
t = qinds[i]
qinds[i] = qinds[j]
qinds[j] = t
for ind,v in enumerate(qinds):
self.sqbitindmap[v] = ind
class SyndromeGraph:
def __init__(self, topology, err_qubits):
self.topology = topology
# err qubits is the list of qubits [as their qinds in topology]
self.err_qubits = err_qubits
def getSyndromeGraph(self):
graph = []
topo_len = len(self.topology.qubits)
for i in range(len(self.err_qubits)):
graph.append([])
for j in range(len(self.err_qubits)):
graph[i].append(1000)
for i in range(len(self.err_qubits)):
for j in range(len(self.err_qubits)):
q_ind_i = self.err_qubits[i]
q_ind_j = self.err_qubits[j]
qubit_i = self.topology.qubits[q_ind_i]
qubit_j = self.topology.qubits[q_ind_j]
weight = abs(qubit_i.x - qubit_j.x) + abs(qubit_i.y - qubit_j.y)
graph[i][j] = 1000 if weight == 0 else weight
return graph
def getMWPM(self):
row_ind, col_ind = linear_sum_assignment(self.getSyndromeGraph())
matching = list(zip(row_ind, col_ind))
# Use a set to filter out the repeated edges
unique_matching = set()
for edge in matching:
reverse_edge = (edge[1], edge[0])
if reverse_edge not in unique_matching:
unique_matching.add(edge)
# Convert the set back to a list if desired
unique_matching = list(unique_matching)
print("Minimum weight perfect matching:")
for match in unique_matching:
print(err_qubits[match[0]], err_qubits[match[1]])
# Press the green button in the gutter to run the script.
if __name__ == '__main__':
t = Topology(6, 2, 3)
#t.enablespecialindmap()
t.implementcircuit()
t.addancilla()
t.addnoise(0.01)
t.addmeasurementcircuit()
#t.addmeasurement()
#t.printcircuit()
t.takeameasurement()
err_qubits = [1,3,5,7,9,11]
b = SyndromeGraph(t, err_qubits)
# print(b.getSyndromeGraph())
print("Matrix")
for row in b.getSyndromeGraph():
print(row)
print()
b.getMWPM()
print(len(t.qubits.keys()))