Dephasing effects on stimulated Raman adiabatic passage in tripod configurations

Details Dephasing effects on stimulated Raman adiabatic passage in tripod configurations Dephasing effects on stimulated Raman adiabatic passage in tripod configurations

2010-09-14

arxiv.org/abs/1009.2623v1

Physical Review A 82, 033437 (2010)

Physics

Quantum Physics

13 pages; 9 figures; Accepted for publication Physical Review A

Scientific paper

10.1103/PhysRevA.82.033437

We present an analytic description of the effects of dephasing processes on stimulated Raman adiabatic passage in a tripod quantum system. To this end, we develop an effective two-level model. Our analysis makes use of the adiabatic approximation in the weak dephasing regime. An effective master equation for a two-level system formed by two dark states is derived, where analytic solutions are obtained by utilizing the Demkov-Kunike model. From these, it is found that the fidelity for the final coherent superposition state decreases exponentially for increasing dephasing rates. Depending on the pulse ordering and for adiabatic evolution the pulse delay can have an inverse effect.

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