Robustness of hashing protocols for entanglement purification

M. Zwerger, H. J. Briegel, and W. Dür
Phys. Rev. A 90, 012314 – Published 10 July 2014

Abstract

We investigate entanglement purification protocols based on hashing, where a large number of noisy entangled pairs are jointly processed to obtain a reduced number of perfect, noiseless copies. While hashing and breeding protocols are the only purification protocols that asymptotically obtain a nonzero yield, they are not applicable in a realistic scenario if local gates and measurements are imperfect. We show that such problems can be overcome by a compact measurement-based implementation, yielding entanglement purification schemes with nonzero yield that are applicable also in noisy scenarios, with tolerable noise per particle of several percent. We also generalize these findings to multiparty purification protocols for arbitrary graph states.

  • Received 21 May 2014

DOI:https://doi.org/10.1103/PhysRevA.90.012314

©2014 American Physical Society

Authors & Affiliations

M. Zwerger1,2, H. J. Briegel1,2, and W. Dür1

  • 1Institut für Theoretische Physik, Universität Innsbruck, Technikerstraße 25, A-6020 Innsbruck, Austria
  • 2Institut für Quantenoptik und Quanteninformation, Österreichischen Akademie der Wissenschaften, A-6020 Innsbruck, Austria

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Vol. 90, Iss. 1 — July 2014

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