Quantum Repeaters: The Role of Imperfect Local Operations in Quantum Communication

H.-J. Briegel, W. Dür, J. I. Cirac, and P. Zoller
Phys. Rev. Lett. 81, 5932 – Published 28 December 1998
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Abstract

In quantum communication via noisy channels, the error probability scales exponentially with the length of the channel. We present a scheme of a quantum repeater that overcomes this limitation. The central idea is to connect a string of (imperfect) entangled pairs of particles by using a novel nested purification protocol, thereby creating a single distant pair of high fidelity. Our scheme tolerates general errors on the percent level, it works with a polynomial overhead in time and a logarithmic overhead in the number of particles that need to be controlled locally.

  • Received 20 March 1998

DOI:https://doi.org/10.1103/PhysRevLett.81.5932

©1998 American Physical Society

Authors & Affiliations

H.-J. Briegel1,2,*, W. Dür1, J. I. Cirac1,2, and P. Zoller1

  • 1Institut für Theoretische Physik, Universität Innsbruck, Technikerstrasse 25, A-6020 Innsbruck, Austria
  • 2Departamento de Fisica, Universidad de Castilla-La Mancha, 13071 Ciudad Real, Spain

  • *On leave from Institut für Theoretische Physik, Universität München, Theresienstrasse 37, D-80333 München, Germany.

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Vol. 81, Iss. 26 — 28 December 1998

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