General detectability measure

TL;DR

This paper introduces a general measure for the detectability of resource states in quantum information, based on hypothesis testing and reverse relative entropy, applicable to various classes of resource-free states.

Contribution

It develops a quantum hypothesis testing framework to quantify the exponential decay rate of detection failure, defining a universal detectability measure for resource states.

Findings

Derived the optimal exponential decay rate for resource detection

Identified the minimum reverse relative entropy as the detectability measure

Applicable to separable, PPT, and stabilizer state sets

Abstract

Distinguishing resource states from resource-free states is a fundamental task in quantum information. We have approached the state detection problem through a hypothesis testing framework, with the alternative hypothesis set comprising resource-free states in a general context. Consequently, we derived the optimal exponential decay rate of the failure probability for detecting a given $n$-tensor product state when the resource-free states are separable states, positive partial transpose (PPT) states, or the convex hull of the set of stabilizer states. This optimal exponential decay rate is determined by the minimum of the reverse relative entropy, indicating that this minimum value serves as the general detectability measure. The key technique of this paper is a quantum version of empirical distribution.