noisy circuit by openfermion

Question

I am working on designing quantum error mitigation algorithms for simulating chemical systems. Therefore, a necessary component is to add noisy to the ideal circuit when using a quantum simulator. But I notice there is no such features in the official documentation of openfermion. Is there a way to add noise to the circuit in openfermion?

Answer 1

Note that OpenFermion interoperates with cirq to provide many features that are not specific to quantum chemistry. You can add noise to your circuits like this

noisy = ideal.with_noise(cirq.depolarize(p=0.01))

where ideal and noisy are instances of cirq.Circuit. Alternatively, you can use a simulator such as cirq.DensityMatrixSimulator which allows you to add noise to the simulation, e.g.

noise = cirq.ConstantQubitNoiseModel(cirq.depolarize(0.01))
noisy_simulator = cirq.DensityMatrixSimulator(noise=noise)

See this notebook for more details and code examples for both approaches.