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Phys. Rev. Lett. 96, 030501 (2006) [4 pages]

Improved Transfer of Quantum Information Using a Local Memory

Vittorio Giovannetti1 and Daniel Burgarth2
1NEST-INFM and Scuola Normale Superiore, Piazza dei Cavalieri 7, I-56126 Pisa, Italy
2Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, United Kingdom

Received 8 August 2005; published 25 January 2006

We demonstrate that the quantum communication between two parties can be significantly improved if the receiver is allowed to store the received signals in a quantum memory before decoding them. In the limit of an infinite memory, the transfer is perfect. We prove that this scheme allows the transfer of arbitrary multipartite states along Heisenberg chains of spin-1/2 particles with random coupling strengths.

©2006 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevLett.96.030501
DOI: 10.1103/PhysRevLett.96.030501
PACS: 03.67.Hk; 05.50.+q; 05.60.Gg; 75.10.Pq
  • 03.67.Hk
    Quantum communication
  • 05.50.+q
    Lattice theory and statistics including Ising, Potts models, etc
  • 05.60.Gg
    Quantum transport
  • 75.10.Pq
    Spin chain models of magnetic ordering
  • YEAR: 2006
KEYWORDS: Heisenberg model, quantum communication, spin systems

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