Quantum states with equal unlockable correlations and quantum discord

M. Nikaeen, A. Mani, and A. Bahrampour
Phys. Rev. A 98, 032320 – Published 19 September 2018

Abstract

In the context of quantum locking of classical correlations protocols, the condition for equality of the amount of unlockable correlations and quantum discord of general classical-quantum states is investigated. Based on this condition, the structure of such general states is obtained. This condition imposes two constraints on the structure of general classical-quantum states. After presenting the interpretation of these constraints, their role in quantum locking protocols is discussed. Finally, the derived structure is generalized to quantum-quantum states and the amount of their unlockable correlations is interpreted in terms of their symmetric discord.

  • Figure
  • Received 1 May 2018

DOI:https://doi.org/10.1103/PhysRevA.98.032320

©2018 American Physical Society

Physics Subject Headings (PhySH)

Quantum Information, Science & Technology

Authors & Affiliations

M. Nikaeen*

  • Department of Physics, Sharif University of Technology, P.O. Box 11155-9161, Tehran, Iran and Department of Communication Technology, Iran Telecommunication Research Center (ITRC), P.O. Box 14155-3961, Tehran, Iran

A. Mani

  • Department of Engineering Science, College of Engineering, University of Tehran, Tehran, Iran

A. Bahrampour

  • Department of Physics, Sharif University of Technology, P.O. Box 11155-9161, Tehran, Iran

  • *nikaeen.morteza@gmail.com

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Issue

Vol. 98, Iss. 3 — September 2018

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