Mitigating errors by quantum verification and postselection

Correcting errors due to noise in quantum circuits run on current and near-term hardware is essential for any convincing demonstration of advantage. Indeed, many cases it has been shown that renders efficiently classically simulable, thereby destroying advantage potentially offered by an ideal (noiseless) implementation these circuits. Although the technique error correction (QEC) allows correcting very accurately, QEC usually requires a large overhead physical qubits which not reachable with currently available hardware. This motivation behind field mitigation, aims at developing techniques correct important part circuits, while also being compatible In this work, we present mitigation based from verification, so-called accreditation protocol, together postselection. Our expectation value observable $O$, output multiple runs noisy where level preparations, gates, measurements. We discuss sample complexity our procedure provide rigorous guarantees mitigated under some realistic assumptions noise. tailored time-dependent behaviors, as allow states be different between protocol. validate findings running