ErrorEstimate

class ErrorEstimate(compilation, physical, overall)

The three errors of a compiled circuit.

For a unitary target each is an average gate infidelity of the whole register. For a state preparation the compilation and overall errors are state infidelities, and the physical error is the average gate infidelity of the gates’ noise, which is the state infidelity that noise causes when it is depolarizing.

Variables:

• compilation – How far the circuit, run without noise, sits from the target. Computed exactly.

• physical – What the gates’ own errors are expected to cost. A model estimate.

• overall – The two together.