Cirq is a Python framework for building, simulating, and running quantum circuits. It allows developers and researchers to design quantum algorithms, test them on classical simulators, and execute them on real quantum hardware. Cirq is widely used in quantum computing research, algorithm development, and for connecting to cloud-based quantum processors.

Features of Cirq:

• Provides core components for creating qubits, gates, measurements, and circuits.
• Supports classical simulation of quantum circuits via high-performance simulators.
• Integrates with quantum hardware providers such as Google Quantum Engine, IonQ, AQT, and Pasqal.
• Enables parameterized circuits, noise modeling, and circuit optimization.
• Includes tools for visualizing circuits and debugging quantum algorithms.
• Actively maintained and compatible with modern Python versions.

To check the installed version of Cirq, run these commands in your environment:

$ source ~/cirq-venv/bin/activate
$ python3 -m pip show cirq

Disclaimer: Cirq is open-source software released under the Apache 2.0 License and maintained by Google and the open-source community. Users are responsible for correct installation and usage in their specific applications. Always refer to the official documentation for the most accurate and up-to-date information.