Original scientific paper

Efficient Quantum Information Transfer Through a Uniform Channel

Leonardo Banchi ; Dipartimento di Fisica e Astronomia, Universita' di Firenze, Italy
Tony J. G. Apollaro ; Dipartimento di Fisica e Astronomia, Universita' di Firenze, Italy
Alessandro Cuccoli ; Dipartimento di Fisica e Astronomia, Universita' di Firenze, Italy
Ruggero Vaia ; Istituto dei Sistemi Complessi - CNR, Italy
Paola Verrucchi ; Istituto Nazionale di Fisica Nucleare, Sezione di Firenze, Italy

Abstract

Effective quantum‐state and entanglement transfer
can be obtained by inducing a coherent dynamics in
quantum wires with homogeneous intrawire interactions.
This goal is accomplished by optimally tuning the coupling
between the wire endpoints and the two qubits there
attached. A general procedure to determine such value is
devised, and scaling laws between the optimal coupling
and the length of the wire are found. The procedure is
implemented in the case of a wire consisting of a spin‐1/2
XY chain: results for the time dependence of the quantities
which characterize quantum‐state and entanglement transfer
are found of extremely good quality also for very long
wires. The present approach does not require engineered
intrawire interactions nor a specific initial pulse shaping,
and can be applied to a vast class of quantum channels.

Keywords

spin chains; dynamics; quantum channels; entanglement

Hrčak ID:

71561

URI

https://hrcak.srce.hr/71561

Publication date:

15.6.2011.

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