Experimental multipartner quantum communication complexity employing just one qubit

  • Authors:
  • Pavel Trojek;Christian Schmid;Mohamed Bourennane;Časlav Brukner;Marek Żukowski;Harald Weinfurter

  • Affiliations:
  • Ludwig-Maximilians-Universität, München, Germany 80799 and Max-Planck-Insititut für Quantenoptik, Garching, Germany 85748;Ludwig-Maximilians-Universität, München, Germany 80799 and Max-Planck-Insititut für Quantenoptik, Garching, Germany 85748;Physics Department, Stockholm University, Stockholm, Sweden 10691;Institut für Experimentalphysik, Universität Wien, Wien, Austria 1090;Instytut Fizyki Teoretycznej i Astrofizyki, Uniwersytet Gdanski, Gdansk, Poland 80-952;Ludwig-Maximilians-Universität, München, Germany 80799 and Max-Planck-Insititut für Quantenoptik, Garching, Germany 85748

  • Venue:
  • Natural Computing: an international journal
  • Year:
  • 2013

Quantified Score

Hi-index 0.00

Visualization

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 驴 1 bit communication, can be exponentially improved by N 驴 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.