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    4. Volume 93
    5. Issue 5

    • Fulltext

       

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      Permanent link:
      https://www.ias.ac.in/article/fulltext/pram/093/05/0069

    • Keywords

       

      Robustness of coherence; subadditivity; $l_{1}$-norm

    • Abstract

       

      In this brief report, we prove that the robustness of coherence (ROC), in contrast with many popular quantitative measures of quantum coherence derived from the resource-theoretic framework of coherence, may be a subadditive for a specific class of multipartite quantum states. We investigate how the subadditivity is affected by admixture with other classes of states for which ROC is superadditive. We show that pairs of quantum states may have different orderings with respect to relative entropy of coherence, $l_{1}$-norm of coherence and ROC and numerically study the difference in ordering for the chosen pairwise coherence measures.

    • Author Affiliations

       

      CHIRANJIB MUKHOPADHYAY1 2 UDIT KAMAL SHARMA3 INDRANIL CHAKRABARTY3

      1. Harish-Chandra Research Institute, Chhatnag Road, Jhusi, Allahabad 211 019, India
      2. Training School Complex, Homi Bhabha National Institute, Anushakti Nagar, Mumbai 400 085, India
      3. Centre for Security, Theory and Algorithmic Research, International Institute of Information Technology, Gachibowli, Hyderabad 500 032, India

    • Dates

       
      Published
      1 November 2019
      Manuscript received
      7 March 2018
      Manuscript revised
      26 April 2019
      Accepted
      2 May 2019
      Early published
      Unedited version published online

  • Pramana – Journal of Physics | News

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      Posted on July 25, 2019

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