Modulation of dephasing due to a spin-boson environment

Details Modulation of dephasing due to a spin-boson environment Modulation of dephasing due to a spin-boson environment

2004-12-22

arxiv.org/abs/cond-mat/0412615v1

Chem. Phys. 296, 325 - 332 (2004)

Physics

Condensed Matter

Statistical Mechanics

16 pages, 2 figures, Chemical Physics special issue on the Spin-Boson problem, edited by H. Grabert and A. Nitzan

Scientific paper

10.1016/j.chemphys.2003.08.027

We study the reduced dynamics of a spin (qubit) coupled to a spin-boson environment in the case of pure dephasing. We derive formal exact expressions which can be cast in terms of exact integro-differential master equations. We present results for a SB environment with ohmic dissipation at finite temperatures. For the special value of the ohmic damping strength K=1/2 the reduced dynamics is found in analytic form. For K<<1 we discuss the possibility of modulating the effect of the SB environment on the qubit. In particular we study the effect of the crossover to a slow environment dynamics, which may be triggered by changing both the temperature and the system-environment coupling.

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