QCircuits
Full documentation at
www.awebb.info/qcircuits/index.html.
QCircuits is a Python package for the simulation and study of quantum
computers based on the quantum circuit
model. It has been
designed to have a simple, lightweight interface and to be easy to use,
particularly for those new to quantum computing.
Installation
Install with pip:
pip install qcircuits
or from the source available here.
Example usage: quantum teleportation
Quantum circuit:
Code:
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, that she wishes to transport to Bob.
alice = qc.qubit(theta=1, phi=1, global_phase=0.2)
# A previously prepared Bell state, with one qubit owned by
# alice, and another by Bob, now physically separated.
bell_state = qc.bell_state(0, 0)
# The state vector for the whole system.
phi = alice * bell_state
# Alice applies a CNOT gate to her two qubit, and then
# a Hadamard gate to her private qubit.
phi = CNOT(phi, qubit_indices=[0, 1])
phi = H(phi, qubit_indices=[0])
# Alice measures the first two bits, and transmits the classical
# bits to Bob.
# The only uncollapsed part of the state vector is Bob's.
M1, M2 = phi.measure(qubit_indices=[0, 1], remove=True)
# Apply X and/or Z gates to third qubit depending on measurements
if M2:
print('First bit 1, applying X\n')
phi = X(phi)
if M1:
print('Second bit 1, applying Z\n')
phi = Z(phi)
print('Original state:', alice)
print('\nTeleported state:', phi)