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

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

Research output: Contribution to journalArticle

5 Citations (Scopus)

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.

Original languageEnglish
Article number052132
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Volume87
Issue number5
DOIs
Publication statusPublished - 2013 May 23

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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