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Experimental multipartner quantum communication complexity employing just one qubit

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Abstract

Most proposals for quantum solutions of information-theoretic problems rely on the usage of multi-partite entangled states which are still difficult to produce experimentally with current state-of-the-art technology. Here, we analyze a scheme to simplify a particular kind of multiparty communication protocols for the experiment. We prove that the fidelity of two communication complexity protocols, allowing for an N − 1 bit communication, can be exponentially improved by N − 1 (unentangled) qubit communication. Taking into account, for a fair comparison, all inefficiencies of state-of-the-art set-up, the experimental implementation for N = 5 outperforms the best classical protocol, making it the candidate for multi-party quantum communication applications.

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Acknowledgements

This work was supported by the DFG, EU-FET (RamboQ, IST-2001-38864), Marie-Curie program and DAAD/KBN exchange program. M.Ż. was supported by the VI Framewoerk EU programmes QAP and SCALA as well as by Wenner Gren Foundations.

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Authors and Affiliations

  1. Ludwig-Maximilians-Universität, 80799, München, Germany

    Pavel Trojek, Christian Schmid & Harald Weinfurter

  2. Max-Planck-Insititut für Quantenoptik, 85748, Garching, Germany

    Pavel Trojek, Christian Schmid & Harald Weinfurter

  3. Physics Department, Stockholm University, 10691, Stockholm, Sweden

    Mohamed Bourennane

  4. Institut für Experimentalphysik, Universität Wien, Boltzmanngasse 5, 1090, Wien, Austria

    Časlav Brukner

  5. Instytut Fizyki Teoretycznej i Astrofizyki, Uniwersytet Gdanski, 80-952, Gdansk, Poland

    Marek Żukowski

Authors
  1. Pavel Trojek
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  2. Christian Schmid
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  3. Mohamed Bourennane
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  4. Časlav Brukner
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  5. Marek Żukowski
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  6. Harald Weinfurter
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Correspondence to Pavel Trojek.

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Trojek, P., Schmid, C., Bourennane, M. et al. Experimental multipartner quantum communication complexity employing just one qubit. Nat Comput 12, 19–26 (2013). https://doi.org/10.1007/s11047-012-9352-7

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