A semiclassical model for a memory dephasing channel
A, D'Arrigo; G, Benenti; G, Falci; A, D'Arrigo; MATIS CNR-INFM, Catania & Dipartimento di Metodologie Fisiche e Chimiche per l'Ingegneria, Università di Catania, Viale Andrea Doria 6, 95125 Catania, Italy; G, Benenti; CNISM, CNR-INFM & Center for Nonlinear and Complex Systems, Università degli Studi dell'Insubria, Via Valleggio 11, 22100 Como, Italy; Istituto Nazionale di Fisica Nucleare, Sezione di Milano, Via Celoria 16, 20133 Milano, Italy; G, Falci; MATIS CNR-INFM, Catania & Dipartimento di Metodologie Fisiche e Chimiche per l'Ingegneria, Università di Catania, Viale Andrea Doria 6, 95125 Catania, Italy
Журнал:
Physica Scripta
Дата:
2009-07-01
Аннотация:
We study a dephasing channel with memory, described by a Hamiltonian model in which the system–environment interaction is described by a stochastic process. We propose a useful way to describe the correlations of channel uses. Moreover, we give a general expression for the coherences decay factors as a function of the number of channel uses and of the stochastic process power spectrum. We also study the impact of memory on the three-qubit code, showing that correlations among channel uses hardly affect the code performance.
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