Witnessing nonseparability of bipartite quantum operations

TL;DR

This paper introduces a method to detect nonseparability in bipartite quantum operations using channel-state duality and maximally entangled states, demonstrating significant advantages over resource-free protocols.

Contribution

The authors develop a novel approach leveraging channel-state duality and entangled resources to witness nonseparability in quantum processes, enhancing detection capabilities.

Findings

Resource-based method outperforms resource-free protocols

Maximally entangled states improve nonseparability detection

Significant advantage demonstrated in quantum process analysis

Abstract

We provide a method for witnessing nonseparability of quantum processes on shared systems, which uses the channel-state duality. The method uses a maximally entangled state as a resource. We show that using the resource provides significant advantage over the corresponding protocol for nonseparability detection without the resource.