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Generalizing Mermin to n qubits and adding theta angles for plot #1005

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Generalizing Mermin to n qubits and adding theta angles for plot #1005

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59e4edb
first commit with generalization of mermin - angle and qubits
igres26 Oct 9, 2024
15c896e
[pre-commit.ci] auto fixes from pre-commit.com hooks
pre-commit-ci[bot] Oct 9, 2024
703a0ce
fixes mermin - not completed
igres26 Oct 28, 2024
3219031
[pre-commit.ci] auto fixes from pre-commit.com hooks
pre-commit-ci[bot] Oct 28, 2024
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42 changes: 23 additions & 19 deletions src/qibocal/protocols/two_qubit_interaction/mermin/circuits.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2,7 +2,7 @@
from qibo import Circuit, gates


def create_mermin_circuit(qubits, native=True):
def create_mermin_circuit(qubits, native=True, theta=None):
"""Creates the circuit to generate the bell states and with a theta-measurement
bell_state chooses the initial bell state for the test:
0 -> |00>+|11>
Expand All @@ -11,30 +11,34 @@ def create_mermin_circuit(qubits, native=True):
3 -> |10>+|01>
Native defaults to only using GPI2 and GPI gates.
"""
if not theta:
theta = ((n - 1) * 0.25 * np.pi) % (2 * np.pi)
# TODO: implement condition better
# if qubits[1] != 2:
# raise ValueError('The center qubit should be in qubits[1]!')
c = Circuit(len(qubits))
p = [0, 0, 0]
if native:
c.add(gates.GPI2(qubits[1], np.pi / 2))
c.add(gates.GPI2(qubits[0], np.pi / 2))
c.add(gates.CZ(qubits[1], qubits[0]))
c.add(gates.GPI2(qubits[0], -np.pi / 2))
c.add(gates.GPI2(qubits[2], np.pi / 2))
c.add(gates.CZ(qubits[1], qubits[2]))
c.add(gates.GPI2(qubits[2], -np.pi / 2))
p[0] -= np.pi / 2
# TODO: not hardcode connections
# Centermost qubit is qubits[0]
for i in range(len(qubits)):
c.add(gates.GPI2(qubits[i], np.pi / 2))
for i in range(1, len(qubits)):
c.add(gates.CZ(qubits[0], qubits[i]))
for i in range(1, len(qubits)):
c.add(gates.GPI2(qubits[i], -np.pi / 2))
p[0] -= theta

else:
c.add(gates.H(qubits[1]))
c.add(gates.H(qubits[0]))
c.add(gates.CZ(qubits[1], qubits[0]))
c.add(gates.H(qubits[0]))
c.add(gates.H(qubits[2]))
c.add(gates.CZ(qubits[1], qubits[2]))
c.add(gates.H(qubits[2]))
c.add(gates.S(0))
# TODO: not hardcode connections
# Centermost qubit is qubits[0]
for i in range(len(qubits)):
c.add(gates.H(qubits[i]))
for i in range(1, len(qubits)):
c.add(gates.CZ(qubits[0], qubits[i]))
for i in range(1, len(qubits)):
c.add(gates.H(qubits[i]))
c.add(gates.U1(0, theta))
return c, p


Expand All @@ -44,7 +48,7 @@ def create_mermin_circuits(qubits, readout_basis, native=True, rerr=None):
rerr adds a readout bitflip error to the simulation.
"""

mermin_circuits = []
mermin_circuits = {}

for basis in readout_basis:
c, p = create_mermin_circuit(qubits, native)
Expand All @@ -64,6 +68,6 @@ def create_mermin_circuits(qubits, readout_basis, native=True, rerr=None):
for qubit in qubits:
c.add(gates.M(qubit))
# c.add(gates.M(qubit, p0=rerr[0], p1=rerr[1]))
mermin_circuits.append(c)
mermin_circuits[basis] = c

return mermin_circuits
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