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EnglishWe 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 much less than 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.
| Titolo: | Modulation of dephasing due to a spin-boson environemnt |
| Autori interni: | |
| Data di pubblicazione: | 2004 |
| Rivista: | |
| Handle: | http://hdl.handle.net/20.500.11769/4233 |
| Appare nelle tipologie: | 1.1 Articolo in rivista |
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http://hdl.handle.net/20.500.11769/4233
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