Entangling efficiency of linear-optical quantum gates

TL;DR

This paper introduces a new measure for evaluating the non-classicality of quantum gates, especially useful for probabilistic devices, and demonstrates its advantages over existing measures like entangling power.

Contribution

The paper proposes a novel measure of non-classicality for quantum gates tailored for probabilistic devices, improving comparison over traditional entangling power.

Findings

The new measure effectively compares deterministic and probabilistic quantum devices.

Examples show the measure's advantages over entangling power.

The measure highlights the potential of probabilistic devices to generate highly entangled states.

Abstract

We propose a new measure of non-classicality of quantum gates which is particularly suitable for probabilistic devices. This measure enables to compare, e.g., deterministic devices which prepare entangled states with low amount of entanglement with probabilistic devices which generate highly entangled states but which fail sometimes. We provide examples demonstrating advantages of this new measure over the so far employed entangling power.