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

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

doi:10.1103/PhysRevA.87.052132

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

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

^*Corresponding author for this work

School of Advanced Science and Engineering

Research output: Contribution to journal › Article › peer-review

6 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 language	English
Article number	052132
Journal	Physical Review A - Atomic, Molecular, and Optical Physics
Volume	87
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevA.87.052132
Publication status	Published - 2013 May 23

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics

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10.1103/PhysRevA.87.052132

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AU - Pascazio, Saverio

AU - Vedral, Vlatko

AU - Yuasa, Kazuya

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AB - 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.

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

Abstract

ASJC Scopus subject areas

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