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Local quantum uncertainty in two-qubit separable states: a case study

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Abstract

Recent findings suggest, separable states, which are otherwise of no use in entanglement dependent tasks, can also be used in information processing tasks that depend upon the discord type general non-classical correlations. In this work, we explore the nature of uncertainty in separable states as measured by local quantum uncertainty. Particularly in two-qubit system, we find separable X state which has maximum local quantum uncertainty. Interestingly, this separable state coincides with the separable state, having maximum geometric discord. We also search for the maximum amount of local quantum uncertainty in separable Bell diagonal states. We indicate an interesting connection to the tightness of entropic uncertainty with the state of maximum uncertainty.

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Acknowledgments

The author A. Sen acknowledges the financial support from University Grants Commission, New Delhi, India. The author D. Sarkar also acknowledges DST SERB for financial support.

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Authors and Affiliations

  1. Department of Applied Mathematics, University of Calcutta, 92, A.P.C. Road, Kolkata, 700009, India

    Ajoy Sen & Debasis Sarkar

  2. Department of Mathematics, Jogesh Chandra Chaudhuri College, 30, Prince Anwar Shah Road, Kolkata, 700033, India

    Amit Bhar

Authors
  1. Ajoy Sen
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  2. Debasis Sarkar
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  3. Amit Bhar
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Correspondence to Debasis Sarkar.

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Sen, A., Sarkar, D. & Bhar, A. Local quantum uncertainty in two-qubit separable states: a case study. Quantum Inf Process 15, 233–243 (2016). https://doi.org/10.1007/s11128-015-1114-x

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  • DOI: https://doi.org/10.1007/s11128-015-1114-x

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