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Quantum conference

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Abstract

A notion of quantum conference is introduced in analogy with the usual notion of a conference that happens frequently in today’s world. Quantum conference is defined as a multiparty secure communication task that allows each party to communicate their message simultaneously to all other parties in a secure manner using quantum resources. Two efficient and secure protocols for quantum conference have been proposed. The security and efficiency of the proposed protocols have been analyzed critically. It is shown that the proposed protocols can be realized using a large number of entangled states and group of operators. Further, it is shown that the proposed schemes can be easily reduced to a protocol for multiparty quantum key distribution and some earlier proposed schemes of quantum conference, where the notion of quantum conference was different.

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Notes

  1. It may be noted that in an ideal scheme of QD, information encoded by two parties exist simultaneously in a channel, but in the protocol for quantum conversation introduced in [20], it was not the case. However, the communication task at hand was equivalent.

  2. To send a string of qubits in secure manner to a distant party, the sender inserts an equal number of qubits as verification qubits. These checking qubits, known as decoy qubits, are prepared randomly in X basis or Z basis. Subsequently, both the sender and receiver compute the error rate on the decoy qubits in analogy of the BB84 protocol which helps them to conclude the secure transmission of the message qubits if the error rate is below the threshold limit.

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Acknowledgements

AB acknowledges support from the Council of Scientific and Industrial Research, Government of India (Scientists’ Pool Scheme). CS thanks Japan Society for the Promotion of Science (JSPS), Grant-in-Aid for JSPS Fellows No. 15F15015. She also thanks Tsinghua University, Beijing, China for the Post-Doctoral Fellowship awarded by the University. KT and AP thank Defense Research & Development Organization (DRDO), India for the support provided through the Project Number ERIP/ER/1403163/M/01/1603.

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Author notes

  1. Chitra Shukla

    Present address: State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing, 100084, China

Authors and Affiliations

  1. Department of Physics and Center for Astroparticle Physics and Space Science, Bose Institute, Block EN, Sector V, Kolkata, India

    Anindita Banerjee

  2. Department of Physics and Materials Science and Engineering, Jaypee Institute of Information Technology, A-10, Sector-62, Noida, UP, 201307, India

    Kishore Thapliyal & Anirban Pathak

  3. Graduate School of Information Science, Nagoya University, Chikusa-ku, Nagoya, 464-8601, Japan

    Chitra Shukla

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  1. Anindita Banerjee
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  2. Kishore Thapliyal
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  4. Anirban Pathak
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Correspondence to Anirban Pathak.

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Banerjee, A., Thapliyal, K., Shukla, C. et al. Quantum conference. Quantum Inf Process 17, 161 (2018). https://doi.org/10.1007/s11128-018-1931-9

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