We study the possibility of realizing perfect quantum state transfer in mesoscopic devices. We discuss the case of the Fano-Anderson model extended to two impurities. For a channel with an infinite number of degrees of freedom, we obtain coherent behavior in the case of strong coupling or in weak coupling off resonance. For a finite number of degrees of freedom, coherent behavior is associated with weak coupling and resonance conditions. Finite-temperature and disorder effects are discussed. © 2006 The American Physical Society.
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