BGLS

BGLS is a Python package that implements the Bravyi, Gosset, and Liu Sampling algorithm presented in How to simulate quantum measurement without computing marginals (Phys. Rev. Lett.) (arXiv) for Cirq circuits.

Quickstart

Installation

pip install bgls

Example

import cirq
import bgls

# Example circuit to run.
qubits = cirq.LineQubit.range(2)
circuit = cirq.Circuit(
    cirq.H.on(qubits[0]),
    cirq.CNOT.on(*qubits),
    cirq.measure(*qubits, key="z")
)

# Run the circuit with BGLS.
simulator = bgls.Simulator(
    initial_state=cirq.StateVectorSimulationState(qubits=qubits, initial_state=0),
    apply_op=cirq.protocols.act_on,
    compute_probability=bgls.born.compute_probability_state_vector,
)
results = simulator.run(circuit, repetitions=10)
print(results.histogram(key="z"))

Sample output:

Counter({0: 6, 3: 4})

Documentation

See more details and examples in the Documentation for BGLS.