Operational Characterization of Divisibility of Dynamical Maps

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In this work, we show the operational characterization to the divisibility of dynamical maps in terms of the distinguishability of quantum channels. It is proven that the distinguishability of any pair of quantum channels does not increase under divisible maps, in which the full hierarchy of divisibility is isomorphic to the structure of entanglement between system and environment. This shows that (i) channel distinguishability is the operational quantity signifying (detecting) divisibility (indivisibility) of dynamical maps and (ii) the decision problem for the divisibility of maps is as hard as the separability problem in entanglement theory. We also provide the information-theoretic characterization to the divisibility of maps with conditional min-entropy.
Publisher
AMER PHYSICAL SOC
Issue Date
2016-07
Language
English
Article Type
Article
Citation

PHYSICAL REVIEW LETTERS, v.117, no.5

ISSN
0031-9007
DOI
10.1103/PhysRevLett.117.050403
URI
http://hdl.handle.net/10203/244348
Appears in Collection
EE-Journal Papers(저널논문)
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