Coherence control for qubits

  • We study the influence of an external driving field on the coherence properties of a qubit under the influence of 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.

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Author:Karen M. Fonseca RomeroORCiD, Sigmund KohlerORCiDGND, Peter HänggiORCiDGND
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Publishing Institution:Universität Augsburg
Release Date:2006/09/08
Tag:Decoherence; Quantum computation; Driven systems
GND-Keyword:Qubit; Kohärenz; Quantencomputer
Source:erschienen in: Chemical Physics 296, 307–314 (2004; DOI: 10.1016/j.chemphys.2003.09.015; URL:
Institutes:Mathematisch-Naturwissenschaftlich-Technische Fakultät
Mathematisch-Naturwissenschaftlich-Technische Fakultät / Institut für Physik
Mathematisch-Naturwissenschaftlich-Technische Fakultät / Institut für Physik / Lehrstuhl für Theoretische Physik I
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik