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Witnessing the quantumness of a single system: From anticommutators to interference and discord

Abstract:
We introduce a method to witness the quantumness of a system. The method relies on the fact that the anticommutator of two classical states is always positive. By contrast, we show that there is always a nonpositive anticommutator due to any two quantum states. We notice that interference depends on the trace of the anticommutator of two states, and it is therefore operationally more suitable to detect quantumness by looking at anticommutators of states rather than their commutators. © 2013 American Physical Society.
Publication status:
Published

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Publisher copy:
10.1103/PhysRevA.87.052132

Authors


More by this author
Institution:
University of Oxford
Division:
MPLS
Department:
Physics
Sub department:
Atomic & Laser Physics
Role:
Author
Journal:
PHYSICAL REVIEW A More from this journal
Volume:
87
Issue:
5
Publication date:
2013-05-23
DOI:
EISSN:
1094-1622
ISSN:
1050-2947
Language:
English
Pubs id:
pubs:406248
UUID:
uuid:1f0bc8cf-ca2e-41d0-b310-3d85900060d0
Local pid:
pubs:406248
Source identifiers:
406248
Deposit date:
2013-11-17

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