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

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.

arXiv comment10 pages, 2 figures, title changed, close to published version

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• Quantifying dynamical coherence with coherence measures
• Partial coherence versus entanglement
• Beam splitter as quantum coherence-maker
• Quantum coherence between subspaces: State transformation, Cohering Power, $k$-coherence and other properties
• Witnessing quantum coherence with prior knowledge of observables
• Detecting coherence with respect to general quantum measurements
• Interconversion between block coherence and multipartite entanglement in many-body systems