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Phys. Rev. B 71, 100501(R) (2005) [4 pages]

Solid-state quantum communication with Josephson arrays

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Alessandro Romito and Rosario Fazio
NEST-INFM & Scuola Normale Superiore, Piazza dei Cavalieri 7, 56126 Pisa, Italy

C. Bruder
Department of Physics and Astronomy, University of Basel, Klingelbergstrasse 82, 4056 Basel, Switzerland

Received 11 January 2005; published 4 March 2005

Josephson junction arrays can be used as quantum channels to transfer quantum information between distant sites. In this paper we discuss simple protocols to realize state transfer with high fidelity. The channels do not require complicated gating but use the natural dynamics of a properly designed array. We investigate the influence of static disorder both in the Josephson energies and in the coupling to the background gate charges, as well as the effect of dynamical noise. We also analyze the readout process, and its back action on the state transfer.

© 2005 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.71.100501
DOI:
10.1103/PhysRevB.71.100501
PACS:
74.81.Fa, 03.67.Hk
 
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