Berlin 2005 – scientific programme

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TT: Tiefe Temperaturen

TT 14: Symposium Superconducting Quantum Systems

TT 14.5: Fachvortrag

Saturday, March 5, 2005, 15:45–16:15, TU H104

Quantum communication with Josephson arrays — •Rosario Fazio¹, Alessandro Romito¹, and Christoph Bruder² — ¹NEST-INFM & Scuola Normale Superiore, 56126 Pisa, Italy — ²Department of Physics and Astronomy,University of Basel, Klingelbergstrasse 82, 4056 Basel, Switzerland

Josephson junction arrays can behave as a quantum channels and used to transfer quantum information between distant sites. We discuss simple protocols to realize, withouth external control, state transfer [1] and cloning [2] with high fidelity in Josephson chains. The great advantage of these schemes is that they not require complicate gating but they simply use the natural dynamics of a properly designed array. We propose an experiment, realizable with present day technology, that may allow to implement these protocols. Communication is only mildy affected by the presence of unavoidable defects in the Josephson array.

[1] A. Romito, R. Fazio and C. Bruder, cond-mat/0408057.

[2] G. De Chiara et al. quant-ph/0402071.