Detecting lower bounds to quantum channel capacities

TL;DR

This paper introduces a practical method to estimate lower bounds on quantum channel capacities using minimal measurements, applicable without prior channel knowledge, and demonstrates its effectiveness on common quantum noise models.

Contribution

The authors present a novel, easy-to-implement technique for detecting lower bounds of quantum capacities that does not rely on detailed channel information.

Findings

Effective for single qubit noisy channels

Works for generalized Pauli channels in any finite dimension

Requires only a few measurements

Abstract

We propose a method to detect lower bounds to quantum capacities of a noisy quantum communication channel by means of few measurements. The method is easily implementable and does not require any knowledge about the channel. We test its efficiency by studying its performance for most well known single qubit noisy channels and for the generalised Pauli channel in arbitrary finite dimension.