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

Rosario Fazio*, Kavan Modi, Saverio Pascazio, Vlatko Vedral, Kazuya Yuasa

*この研究の対応する著者

研究成果: Article査読

5 被引用数 (Scopus)

抄録

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.

本文言語English
論文番号052132
ジャーナルPhysical Review A - Atomic, Molecular, and Optical Physics
87
5
DOI
出版ステータスPublished - 2013 5 23

ASJC Scopus subject areas

  • 原子分子物理学および光学

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