Faithful state transfer through a quantum channel

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Simone Paganelli,^1,2 Ferdinando de Pasquale,^1,3 and Gian Luca Giorgi^1,3
¹Dipartimento di Fisica, Università di Roma La Sapienza, Piazzale A. Moro 2, 00185 Roma, Italy
²Dipartimento di Fisica, Università di Bologna, Via Irnerio 46, I-40126, Bologna, Italy
³INFM Center for Statistical Mechanics and Complexity, Piazzale A. Moro 2, 00185 Roma, Italy

Received 28 February 2006; published 20 July 2006

Westudy the possibility of realizing perfect quantum state transfer inmesoscopic devices. We discuss the case of the Fano-Anderson modelextended to two impurities. For a channel with an infinitenumber of degrees of freedom, we obtain coherent behavior inthe case of strong coupling or in weak coupling offresonance. For a finite number of degrees of freedom, coherentbehavior is associated with weak coupling and resonance conditions. Finite-temperatureand disorder effects are discussed.

URL:	http://link.aps.org/doi/10.1103/PhysRevA.74.012316
DOI:	10.1103/PhysRevA.74.012316
PACS:	03.67.Hk; 03.65.Ta; 73.23.-b 03.67.Hk Quantum communication 03.65.Ta Foundations of quantum mechanics; measurement theory 73.23.-b Electronic transport in mesoscopic systems YEAR: 2006
KEYWORDS:	quantum theory, quantum communication, mesoscopic systems

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