QCircuits 0.2.0

A package for simulating small-scale quantum computing

Full documentation at www.awebb.info/qcircuits/index.html.

QCircuits is a lightweight package for simulating the operation of small-scale quantum computers, based on the quantum circuit model. It uses rank d and rank 2d tensors to represent state vectors for and operators on d-qubit systems, rather than using straight vectors and matrices produces by Kronecker products.

Example usage, performing quantum teleportation:

import qcircuits as qc

# Instantiating the operators we will need
CNOT = qc.CNOT()
H = qc.Hadamard()
X = qc.PauliX()
Z = qc.PauliZ()

# Alice's hidden state, and the shared Bell state
alice = qc.qubit(theta=1, phi=1, global_phase=0.2)
bell_state = qc.bell_state(0, 0)
phi = alice * bell_state

phi = CNOT(phi, qubit_indices=[0, 1])
phi = H(phi, qubit_indices=[0])

# Measure the first two bits
M1, phi = phi.measure(qubit_index=0)
M2, bob = phi.measure(qubit_index=0)

# Apply gates based on the classical bits Alice
# sends to Bob
if M2:
    bob = X(bob)
if M1:
    bob = Z(bob)

print('Original state:', alice)
print('\nTeleported state:', bob)