The capability of faithfully transmit quantum states and entanglement through quantum channels is one of the key requirements for the development of quantum devices. Different solutions have been proposed to accomplish such a challenging task, which, however, require either an ad hoc engineering of the internal interactions of the physical system acting as the channel or specific initialization procedures. Here we show that optimal dynamics for efficient quantum-state and entanglement transfer can be attained in generic quantum systems with homogeneous interactions by tuning the coupling between the system and the two attached qubits. We devise a general procedure to determine the optimal coupling, and we explicitly implement it in the case of a channel consisting of a spin-1/2 XY chain. The quality of quantum-state and entanglement transfer is found to be very good and, remarkably, almost independent of the channel length.

Optimal dynamics for quantum-state and entanglement transfer through homogeneous quantum systems / L. Banchi; T. J. G. Apollaro; A. Cuccoli; R. Vaia; P. Verrucchi. - In: PHYSICAL REVIEW A. - ISSN 1050-2947. - STAMPA. - 82:(2010), pp. 052321:1-052321:5. [10.1103/PhysRevA.82.052321]

Optimal dynamics for quantum-state and entanglement transfer through homogeneous quantum systems

BANCHI, LEONARDO;APOLLARO, TONY JOHN GEORGE;CUCCOLI, ALESSANDRO;VERRUCCHI, PAOLA
2010

Abstract

The capability of faithfully transmit quantum states and entanglement through quantum channels is one of the key requirements for the development of quantum devices. Different solutions have been proposed to accomplish such a challenging task, which, however, require either an ad hoc engineering of the internal interactions of the physical system acting as the channel or specific initialization procedures. Here we show that optimal dynamics for efficient quantum-state and entanglement transfer can be attained in generic quantum systems with homogeneous interactions by tuning the coupling between the system and the two attached qubits. We devise a general procedure to determine the optimal coupling, and we explicitly implement it in the case of a channel consisting of a spin-1/2 XY chain. The quality of quantum-state and entanglement transfer is found to be very good and, remarkably, almost independent of the channel length.
2010
82
052321:1
052321:5
L. Banchi; T. J. G. Apollaro; A. Cuccoli; R. Vaia; P. Verrucchi
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/400248
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