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Title: Decoherence induced by a composite environment
Authors: Chaudhry, A.Z.
Gong, J. 
Issue Date: 31-Jan-2014
Citation: Chaudhry, A.Z., Gong, J. (2014-01-31). Decoherence induced by a composite environment. Physical Review A - Atomic, Molecular, and Optical Physics 89 (1) : -. ScholarBank@NUS Repository.
Abstract: It is not always justified to model the environment of a realistic quantum system as a collection of harmonic oscillators or two-level systems. To explore interesting physics associated with a composite environment, here we study the dynamics of a qubit coupled to a second two-level system, which is in turn coupled to a harmonic-oscillator bath. That is, the qubit of interest is in the presence of a composite environment consisting of the second two-level system and a conventional harmonic-oscillator bath. We investigate the issue of pointer states of decoherence for the qubit for different coupling strengths between the qubit and such a composite environment. It is shown that for weak-, intermediate-, or strong-coupling strengths, the qubit's reduced density matrix has a coupling-strength-dependent diagonal representation, thus yielding coupling-strength-dependent computational pointer states. Interestingly, the associated decoherence rate can decrease as the coupling strength increases. © 2014 American Physical Society.
Source Title: Physical Review A - Atomic, Molecular, and Optical Physics
ISSN: 10502947
DOI: 10.1103/PhysRevA.89.014104
Appears in Collections:Staff Publications

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