Unification of nonclassicality measures in interferometry

Xiao Yuan, Hongyi Zhou, Mile Gu, and Xiongfeng Ma
Phys. Rev. A 97, 012331 – Published 24 January 2018

Abstract

From an operational perspective, nonclassicality characterizes the exotic behavior in a physical process which cannot be explained with Newtonian physics. There are several widely used measures of nonclassicality, including coherence, discord, and entanglement, each proven to be essential resources in particular situations. There exists evidence of fundamental connections among the three measures. However, the sources of nonclassicality are still regarded differently and such connections are yet to be elucidated. Here, we introduce a general framework of defining a unified nonclassicality with an operational motivation founded on the capability of interferometry. Nonclassicality appears differently as coherence, discord, and entanglement in different scenarios with local measurement, weak basis-independent measurement, and strong basis-independent measurement, respectively. Our results elaborate how these three measures are related and how they can be transformed from each other. Experimental schemes are proposed to test the results.

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  • Received 3 August 2017
  • Revised 7 December 2017

DOI:https://doi.org/10.1103/PhysRevA.97.012331

©2018 American Physical Society

Physics Subject Headings (PhySH)

Quantum Information, Science & Technology

Authors & Affiliations

Xiao Yuan1, Hongyi Zhou1, Mile Gu2,3,4, and Xiongfeng Ma1,*

  • 1Center for Quantum Information, Institute for Interdisciplinary Information Sciences, Tsinghua University, Beijing 100084, China
  • 2School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 639673, Republic of Singapore
  • 3Complexity Institute, Nanyang Technological University, Singapore 639673, Republic of Singapore
  • 4Centre for Quantum Technologies, National University of Singapore, 3 Science Drive 2, Singapore 117543, Republic of Singapore

  • *xma@tsinghua.edu.cn

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Vol. 97, Iss. 1 — January 2018

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