Experiments using quantum circuits

This is a collection of algorithms and experiments written in and using Cirq. A few use only base Cirq; the rest use additional code stored in ReCirq, a GitHub repository for research code that uses and builds upon Cirq.
Cirq GitHub ReCirq GitHub

Algorithms in base Cirq

Algorithms and experiments that use only default Cirq code.
A workshop notebook with examples that covers algorithms commonly shown in quantum textbooks.
An implementation of the famous integer factorization algorithm by Peter Shor.
An example of computing the ground state of a Hamiltonian using the variational principle.
An example of the quantum analog of a random walk algorithm.
A demonstration of the separation between quantum and classical computers.
An example showing quantum separation with a constant-depth solution.

ReCirq Experiments

Research experiments that use additional library code that resides in the external ReCirq repository.

ReCirq Guide

How to use and contribute to ReCirq.
How to use this code.
How ReCirq experiments are structured.
How ReCirq experiments collect data.
How ReCirq experiments analyze data.
Additional advice on writing ReCirq experiments.

QAOA

Tutorials and examples with the Quantum Approximate Optimization Algorithm.
Introductory QAOA problems.
QAOA experiment Task object.
QAOA analysis with precomputed optimal angles.
QAOA analysis with a hardware landscape.
QAOA analysis with an optimization path.
QAOA on grid-shaped hardware.
Use t|ket> to map QAOA to a generic device.

Hartree-Fock VQE

How to run the Hartree-Fock Variational Quantum Eigensolver experiment.
A short tutorial to show HFVQE in action.
How to make molecule files for use with HFVQE.

Fermi-Hubbard

Simulating spin and charge dynamics with a Fermi-Hubbard model.
End-to-end with a single instance of the Fermi-Hubbard experiment.
Experimental data collected and analyzed.

Quantum Scrambling

Use out-of-time-order (OTOC) correlators to demonstrate quantum scrambling.
Build, run and plot an OTOC circuit.

Toric Code

Explore the toric code model of interacting qubits.
Create a toric code ground state.

Kardar-Parisi-Zhang Physics

Probe the dynamics of transferred magnetization in the Heisenberg spin chain.

Quantum-Classical Quantum Monte Carlo

How to run QCQMC for quantum chemistry applications.
A short tutorial on the code structure.
How to generate a shadow trial wavefunction for a molecular system
Analyze published experimental wavefunctions.