Fidelity for imperfect postselection

TL;DR

This paper introduces a straightforward fidelity measure for mixed state postselecting devices, focusing on scenarios where the output task depends solely on a particular state.

Contribution

It proposes a new fidelity measure tailored for mixed state postselection, enhancing accuracy in assessing device performance.

Findings

The measure effectively quantifies fidelity in postselected quantum devices.

It is particularly suited for tasks influenced only by a specific output state.

Abstract

We describe a simple measure of fidelity for mixed state postselecting devices. The measure is most appropriate for postselection where the task performed by the output is only effected by a specific state.