Circuit Cutting

Circuit Cutting (circuit_knitting.cutting).

Circuit Cutting

cut_wires	Transform all CutWire instructions in a circuit to Move instructions marked for cutting.
expand_observables	Expand observable(s) according to the qubit mapping between original_circuit and final_circuit.
partition_circuit_qubits	Replace all nonlocal gates belonging to more than one partition with instances of TwoQubitQPDGate.
partition_problem	Separate an input circuit and observable(s).
cut_gates	Transform specified gates into TwoQubitQPDGates.
decompose_gates	Transform specified gates into TwoQubitQPDGates.
generate_cutting_experiments	Generate cutting subexperiments and their associated coefficients.
execute_experiments	Generate the sampled circuits, append the observables, and run the sub-experiments.
reconstruct_expectation_values	Reconstruct an expectation value from the results of the sub-experiments.

PartitionedCuttingProblem	The result of decomposing and separating a circuit and observable(s).
CuttingExperimentResults	Circuit cutting subexperiment results and sampling coefficients.
instructions.CutWire	An instruction for denoting a wire cut location.
instructions.Move	A two-qubit instruction representing a reset of the second qubit followed by a swap.

Quasi-Probability Decomposition (QPD)

qpd.QPDBasis	Basis in which to decompose an operation.
qpd.BaseQPDGate	Base class for a gate to be decomposed using quasiprobability decomposition.
qpd.SingleQubitQPDGate	Single qubit gate to be decomposed using quasiprobability decomposition.
qpd.TwoQubitQPDGate	Two qubit gate to be decomposed using quasiprobability decomposition.
qpd.WeightType	Type of weight associated with a QPD sample.

qpd.generate_qpd_weights	Generate weights from the joint quasiprobability distribution.
qpd.generate_qpd_samples	Generate random quasiprobability decompositions.
qpd.decompose_qpd_instructions	Replace all QPD instructions in the circuit with local Qiskit operations and measurements.
qpd.qpdbasis_from_instruction	Generate a QPDBasis object, given a supported operation.

CutQC

cutqc.run_subcircuit_instances	Execute all provided subcircuits.
cutqc.generate_summation_terms	Generate all summation terms for the final reconstructions.
cutqc.build	Reconstruct the full probability distribution from the subcircuits.
cutqc.verify	Compare the reconstructed probabilities to the ground truth.
cutqc.cut_circuit_wires	Decompose the circuit into a collection of subcircuits.
cutqc.evaluate_subcircuits	Evaluate the subcircuits.
cutqc.reconstruct_full_distribution	Reconstruct the full probabilities from the subcircuit evaluations.