Cirq
Cirq is an Apache 2.0 Python framework for designing, manipulating, simulating, and executing Noisy Intermediate-Scale Quantum (NISQ) circuits. Cirq is the canonical client library for Google's Quantum Engine, with cirq-google providing typed access to programs, jobs, processors, reservations, and calibrations. Cirq v1.6.x supports Python 3.11+ and ships dedicated subpackages for AQT, IonQ, Pasqal, and Google hardware backends.