Entanglement and coherence in quantum state merging

TL;DR

This paper explores the interplay of entanglement and coherence in quantum state merging, revealing limitations on resource gains and establishing bounds, with implications for quantum information processing.

Contribution

It introduces the concept of incoherent quantum state merging, develops tools for analyzing it, and derives bounds on entanglement and coherence resources involved.

Findings

No simultaneous gain of entanglement and coherence in merging.

A tight lower bound on the entanglement-coherence sum for all pure states.

An incoherent Schumacher compression rate equal to the von Neumann entropy of diagonal elements.

Abstract

Understanding the resource consumption in distributed scenarios is one of the main goals of quantum information theory. A prominent example for such a scenario is the task of quantum state merging where two parties aim to merge their parts of a tripartite quantum state. In standard quantum state merging, entanglement is considered as an expensive resource, while local quantum operations can be performed at no additional cost. However, recent developments show that some local operations could be more expensive than others: it is reasonable to distinguish between local incoherent operations and local operations which can create coherence. This idea leads us to the task of incoherent quantum state merging, where one of the parties has free access to local incoherent operations only. In this case the resources of the process are quantified by pairs of entanglement and coherence. Here, we develop tools for studying this process, and apply them to several relevant scenarios. While quantum state merging can lead to a gain of entanglement, our results imply that no merging procedure can gain entanglement and coherence at the same time. We also provide a general lower bound on the entanglement-coherence sum, and show that the bound is tight for all pure states. Our results also lead to an incoherent version of Schumacher compression: in this case the compression rate is equal to the von Neumann entropy of the diagonal elements of the corresponding quantum state.