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Assisted distillation of quantum coherence

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


E. Chitambar

A. Streltsov

S. Rana

M. N. Bera

M. Lewenstein


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.


Chitambar, E., Streltsov, A., Rana, S., Bera, M. N., Adesso, G., & Lewenstein, M. (2016). Assisted distillation of quantum coherence. Physical Review Letters, 116(7),

Journal Article Type Article
Acceptance Date Jan 16, 2016
Online Publication Date Feb 17, 2016
Publication Date Feb 19, 2016
Deposit Date Feb 23, 2017
Publicly Available Date Feb 23, 2017
Journal Physical Review Letters
Print ISSN 0031-9007
Electronic ISSN 0031-9007
Publisher American Physical Society
Peer Reviewed Peer Reviewed
Volume 116
Issue 7
Public URL
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