Converting coherence based on positive-operator-valued measures into entanglement

TL;DR

This paper demonstrates how quantum coherence, especially POVM-based coherence, can be converted into entanglement using block incoherent operations, expanding the understanding of quantum resource interconversion.

Contribution

It introduces a method to transform POVM-based coherence into entanglement via Naimark extension and block incoherent operations, highlighting a new resource conversion pathway.

Findings

Block coherence can be transformed into entanglement using block incoherent operations.

POVM-based coherence acts as a resource for entanglement generation.

Strategies involving embedding channels and auxiliary systems enable entanglement creation from coherence.

Abstract

Quantum resource theories provide a diverse and powerful framework for extensively studying the phenomena in quantum physics. Quantum coherence, a quantum resource, is the basic ingredient in many quantum information tasks. It is a subject of broad and current interest in quantum information, and many new concepts have been introduced and generalized since its establishment. Here we show that the block coherence can be transformed into entanglement via a block incoherent operation. Moreover, we find that the POVM-based coherence associated with block coherence through the Naimark extension acts as a potential resource from the perspective of generating entanglement. Finally, we discuss avenues of creating entanglement from POVM-based coherence, present strategies that require embedding channels and auxiliary systems, give some examples, and generalize them.