Cirq¶

Cirq is Google Quantum AI's open-source Python framework for writing, manipulating, and running quantum circuits. It's built with today's noisy, intermediate-scale quantum hardware in mind, giving you fine-grained control over things like qubit layout and gate timing, and it can run circuits on Google's own quantum processors as well as on built-in simulators (including qsim, a high-performance wavefunction simulator).

The code panel can also render your circuit as Cirq. Here's the same H + CNOT circuit rendered as Cirq:

Cirq code view

import cirq
import math

q = cirq.LineQubit.range(3)
circuit = cirq.Circuit()
circuit.append(cirq.H(q[0]))
circuit.append(cirq.CNOT(q[0], q[1]))
print(circuit)

Why the parentheses can look like brackets

As on the Qiskit page, this site's code font (B612 Mono) draws ( and ) in a fairly square, angular style, so calls like cirq.Circuit() or print(circuit) can look bracketed at a glance. The code is ordinary Cirq with real parentheses; only genuine index brackets, like the [0] in q[0], are square brackets.

For the full API reference and guides on running circuits on real hardware or simulators, see the official Cirq documentation.

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