Influence of two-level fluctuators on adiabatic passage techniques

Details Influence of two-level fluctuators on adiabatic passage techniques Influence of two-level fluctuators on adiabatic passage techniques

2012-02-02

arxiv.org/abs/1202.0393v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

7 pages, 6 figures

Scientific paper

We study the effect of two-level fluctuators (TLFs), as they are frequently present in solid-state devices, on the process of Stimulated Raman Adiabatic Passage (STIRAP) performed with a quan- tum three-level system. When the amplitudes of the driving-pulses used in the STIRAP are in resonance with the level spacing of the fluctuators the quality of the protocol, i.e., the transferred population decreases sharply. In general the effect can not be reduced by speeding up the STIRAP process. We also discuss the effect of a structured noise environment on the process of Coherent Tunneling by Adiabatic Passage (CTAP). The effect of a weakly structured environment or TLFs with short coherence times on STIRAP and CTAP can be described by the Bloch-Redfield theory. For a strongly structured environment a higher-dimensional approach has to be used where the TLFs are treated as part of the system.

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