期刊
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
卷 52, 期 47, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1751-8121/ab30f7
关键词
distinguishability; quantum channels; coherence; decoherence
资金
- ARC via the Centre of Excellence in Engineered Quantum Systems [CE170100009]
- Polish National Science Centre [2016/22/E/ST6/00062, 2015/18/A/ST2/00274]
We investigate an original family of quantum distinguishability problems, where the goal is to perfectly distinguish between M quantum states that become identical under a completely decohering map. Similarly, we study distinguishability of M quantum channels that cannot be distinguished when one is restricted to decohered input and output states. The studied problems arise naturally in the presence of a superselection rule, allow one to quantify the amount of information that can be encoded in phase degrees of freedom (coherences), and are related to time-energy uncertainty relation. We present a collection of results on both necessary and sufficient conditions for the existence of M perfectly distinguishable states (channels) that are classically indistinguishable.
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