https://github.com/grey-area/qcircuits

A Python package for simulating small-scale quantum computers.
https://github.com/grey-area/qcircuits

Last synced: about 2 months ago
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A Python package for simulating small-scale quantum computers.

• Host: GitHub
• URL: https://github.com/grey-area/qcircuits
• Owner: grey-area
• License: mit
• Created: 2019-03-08T09:58:07.000Z (almost 6 years ago)
• Default Branch: master
• Last Pushed: 2022-07-08T02:24:26.000Z (over 2 years ago)
• Last Synced: 2024-04-21T11:16:54.594Z (9 months ago)
• Language: Python
• Homepage: http://www.awebb.info/qcircuits/index.html
• Size: 503 KB
• Stars: 57
• Watchers: 2
• Forks: 10
• Open Issues: 3
• Metadata Files:
  • Readme: README.rst
  • Changelog: CHANGES.rst
  • License: LICENSE.txt

Awesome Lists containing this project

• awesome-quantum-software - QCircuits - User-friendly quantum circuit simulator designed for students and newcomers to quantum computing. (Quantum simulators)

README

        
=========

QCircuits

=========

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

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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.

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Installation

============

Install with pip:

``pip install qcircuits``

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or from the source available here.

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Example usage: quantum teleportation

====================================

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Quantum circuit:

.. image:: http://www.awebb.info/qcircuits/_images/teleport.png

    :scale: 40%

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)

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