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.
Documentation, tutorial, and examples¶
Install with pip:
pip install qcircuits
or from the source at github.com/grey-area/qcircuits.
Example usage: quantum teleportation¶
See the examples page for more examples.
import qcircuits as qc # Quantum Teleportation: transmitting two classical bits to transport a qubit state # Alice has a qubit in a given quantum state. # Alice and Bob have previously prepared a Bell state, and have since # physically separated the qubits. # Alice manipulates her hidden qubit and her half of the Bell state, and then # measures both qubits. # She sends the result (two classical bits) to Bob, who is able to reconstruct # Alice's state by applying operators based on the measurement outcomes. def quantum_teleportation(alice_state): # Get operators we will need CNOT = qc.CNOT() H = qc.Hadamard() X = qc.PauliX() Z = qc.PauliZ() # The prepared, shared Bell state bell = qc.bell_state(0, 0) # The whole state vector state = alice_state * bell # Apply CNOT and Hadamard gate state = CNOT(state, qubit_indices=[0, 1]) state = H(state, qubit_indices=) # Measure the first two bits # The only uncollapsed part of the state vector is Bob's M1, M2 = state.measure(qubit_indices=[0, 1], remove=True) # Apply X and/or Z gates to third qubit depending on measurements if M2: state = X(state) if M1: state = Z(state) return state if __name__ == '__main__': # Alice's original state to be teleported to Bob alice = qc.qubit(theta=1.5, phi=0.5, global_phase=0.2) # Bob's state after quantum teleportation bob = quantum_teleportation(alice) print('Original state:', alice) print('\nTeleported state:', bob)