Cirq

Cirq is a Python library for writing, manipulating, and optimizing quantum circuits and running them against quantum computers and simulators.

Installation

Follow these instructions.

Hello Qubit

A simple example to get you up and running:

import cirq

# Define a qubit.
qubit = cirq.google.XmonQubit(0, 0)

# Create a circuit (qubits start in the |0> state).
circuit = cirq.Circuit()
circuit.append([
    # Square root of NOT.
    cirq.X.on(qubit)**0.5,

    # Measurement.
    cirq.MeasurementGate('result').on(qubit)
])
print("Circuit:")
print(circuit)

# Now simulate the circuit and print out the measurement result.
simulator = cirq.google.Simulator()
result = simulator.run(circuit, repetitions=10)
results = [str(int(b)) for b in result.measurements['result'][:, 0]]
print("Simulated measurement results:")
print(''.join(results))

Example output:

Circuit:
(0, 0): ───X^0.5───M───

Simulated measurement results:
1110111010

Documentation

See here or jump straight to the tutorial

Contributing

We welcome contributions. Please follow these guidelines.

Disclaimer

Copyright 2018 The Cirq Developers. This is not an official Google product.