Coherence control for qubits

We study the influence of an external driving field on the coherence properties of a qubit subject to bit-flip noise. In the presence of driving, two paradigmatic cases are considered: (i) a field that results for a suitable choice of the parameters in so-called coherent destruction of tunneling and...

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Bibliographic Details
Published inChemical physics Vol. 296; no. 2; pp. 307 - 314
Main Authors Fonseca-Romero, Karen M., Kohler, Sigmund, Hänggi, Peter
Format Journal Article
LanguageEnglish
Published Elsevier B.V 26.01.2004
Subjects
Decoherence
Driven systems
Quantum computation
Decoherence
Quantum computation
Driven systems
03.65.Yz
03.67.Pp
Online AccessGet full text
ISSN0301-0104
DOI10.1016/j.chemphys.2003.09.015

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Summary:We study the influence of an external driving field on the coherence properties of a qubit subject to bit-flip noise. In the presence of driving, two paradigmatic cases are considered: (i) a field that results for a suitable choice of the parameters in so-called coherent destruction of tunneling and (ii) one that commutes with the static qubit Hamiltonian. In each case, we give for high-frequency driving a lower bound for the coherence time. This reveals the conditions under which the external fields can be used for coherence stabilization.
ISSN:0301-0104
DOI:10.1016/j.chemphys.2003.09.015