Assisted Distillation of Quantum Coherence

E. Chitambar, A. Streltsov, S. Rana, M. N. Bera, G. Adesso, M. Lewenstein

Research output: Contribution to journalArticle

Abstract

We introduce and study the task of assisted coherence distillation. This task arises naturally in bipartite systems where both parties work together to generate the maximal possible coherence on one of the subsystems. Only incoherent operations are allowed on the target system, while general local quantum operations are permitted on the other; this is an operational paradigm that we call local quantum-incoherent operations and classical communication. We show that the asymptotic rate of assisted coherence distillation for pure states is equal to the coherence of assistance, an analog of the entanglement of assistance, whose properties we characterize. Our findings imply a novel interpretation of the von Neumann entropy: it quantifies the maximum amount of extra quantum coherence a system can gain when receiving assistance from a collaborative party. Our results are generalized to coherence localization in a multipartite setting and possible applications are discussed.

Original languageEnglish (US)
Article number070402
JournalPhysical review letters
Volume116
Issue number7
DOIs
StatePublished - Feb 17 2016

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Chitambar, E., Streltsov, A., Rana, S., Bera, M. N., Adesso, G., & Lewenstein, M. (2016). Assisted Distillation of Quantum Coherence. Physical review letters, 116(7), [070402]. https://doi.org/10.1103/PhysRevLett.116.070402