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Ping-pong quantum key distribution with trusted noise: non-Markovian advantage

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Abstract

The ping-pong protocol adapted for quantum key distribution is studied in the trusted quantum noise scenario, wherein the legitimate parties can add noise locally. For a well-studied attack model, we show how non-unital, quantum non-Markovianity of the added noise can improve the key rate. We also point out that this noise-induced advantage cannot be obtained by Alice and Bob by adding local classical noise to their post-measurement data.

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Acknowledgements

SU and RS acknowledge financial support of the Government of India DST-SERB grant EMR/2016/004019. SU also thanks the Admar Mutt Education Foundation (AMEF), Bengaluru, Karnataka, India, for partial financial support. SB and RS acknowledge the support from Interdisciplinary Cyber Physical Systems (ICPS) program of the Department of Science and Technology (DST), India, Grants No.: DST/ICPS/QuST/Theme-1/2019/6 and DST/ICPS/QuST/Theme-1/2019/14, respectively. US thanks Ashutosh Singh and S. Omkar for helpful discussions.

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Authors and Affiliations

  1. Poornaprajna Institute of Scientific Research, Bengaluru, 560080, India

    Shrikant Utagi & R. Srikanth

  2. Manipal Academy of Higher Education, Manipal, 576104, India

    Shrikant Utagi

  3. Indian Institute of Technology, IIT-Jodhpur, Jodhpur, India

    Subhashish Banerjee

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  1. Shrikant Utagi
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  2. R. Srikanth
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  3. Subhashish Banerjee
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Correspondence to R. Srikanth.

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Utagi, S., Srikanth, R. & Banerjee, S. Ping-pong quantum key distribution with trusted noise: non-Markovian advantage. Quantum Inf Process 19, 366 (2020). https://doi.org/10.1007/s11128-020-02874-4

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