A lower bound on the probability of error in quantum state discrimination

TL;DR

This paper establishes a fundamental lower bound on the probability of error in quantum state discrimination, based on the pairwise fidelities of the states, providing insights into the limits of quantum measurement accuracy.

Contribution

It introduces a new lower bound on error probability in quantum state discrimination using pairwise fidelities, advancing theoretical understanding of quantum measurement limits.

Findings

The bound is a weighted sum of pairwise fidelities.

The bound provides a fundamental limit on discrimination accuracy.

It applies to general quantum states in discrimination tasks.

Abstract

We give a lower bound on the probability of error in quantum state discrimination. The bound is a weighted sum of the pairwise fidelities of the states to be distinguished.