http://www.cnr.it/ontology/cnr/individuo/prodotto/ID57697

Long quantum channels for high-quality entanglement transfer (Articolo in rivista)

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Label

Long quantum channels for high-quality entanglement transfer (Articolo in rivista) (literal)

Anno

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Alternative label

L. Banchi (1,2); T. J. G. Apollaro (1); A. Cuccoli (1,2,3); R. Vaia (4,5); P. Verrucchi (1,2,4) (2011)
Long quantum channels for high-quality entanglement transfer
in New journal of physics; IOP Publishing Ltd., Bristol BS1 6BE (Regno Unito); Deutsche Physikalische Gesellschaft, Berlin (Germania)
(literal)

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L. Banchi (1,2); T. J. G. Apollaro (1); A. Cuccoli (1,2,3); R. Vaia (4,5); P. Verrucchi (1,2,4) (literal)

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Note

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1) Dipartimento di Fisica, Università di Firenze, Via G Sansone 1, I-50019 Sesto Fiorentino (FI), Italy 2) INFN, Sezione di Firenze, via G Sansone 1, I-50019 Sesto Fiorentino (FI), Italy 3) CNISM Consorzio Nazionale Interuniversitario per le Scienze Fisiche della Materia, Italy 4) Istituto dei Sistemi Complessi, Consiglio Nazionale delle Ricerche, via Madonna del Piano 10, I-50019 Sesto Fiorentino (FI), Italy (literal)

Titolo

Abstract

High-quality quantum-state and entanglement transfer can be achieved in an unmodulated spin bus operating in the ballistic regime, which occurs when the endpoint qubits A and B are nonperturbatively coupled to the chain by a suitable exchange interaction j0. Indeed, the transition amplitude characterizing the transfer quality exhibits a maximum for a finite optimal value jopt0(N), where N is the channel length. We show that jopt0(N) scales as N-1/6 for large N and that it ensures a high-quality entanglement transfer even in the limit of arbitrarily long channels, almost independently of the channel initialization. For instance, for any chain length the average quantum-state transmission fidelity exceeds 90% and decreases very little in a broad neighbourhood of jopt0(N). We emphasize that, taking the reverse point of view, should j0 be experimentally constrained, high-quality transfer can still be obtained by adjusting the channel length to its optimal value. (literal)

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