Raman adiabatic passage excitation

Coherent excitation of quantum systems by external fields is a versatile and powerful tool for application in quantum control. In particular, adiabatic evolution has been widely used to produce population transfer between discrete quantum states. Eor two states the control is by means of a varying detuning (a chirp), while for three states the change is induced, for example, by a pair of pulses, offset in time, that implement stimulated Raman adiabatic passage (STIRAP) [1-3]. STIRAP produces complete population transfer between the two end states 11) and 3) of a chain linked by two fields. In the adiabatic limit, the process places no temporary population in the middle state 2), even though the two driving fields - pump and Stokes-may be on exact resonance with their respective transitions, 1) 2)and... 

S. Q. Jin, S. Q. Gong, R. X. Li, and Z. Z. Xu. Coherent population transfer and superposition of atomic states via stimulated Raman adiabatic passage using an excited-doublet four-level atom. 

With a coherent stimulated Raman process (STIRAP) (see Sect. 7.3), nearly the whole initial population Ni may be transferred into the final level If) [1048]. Here no exact resonance with the intermediate excited level ) is wanted in order to avoid transfer losses by spontaneous emission from level ). The population transfer can be explained by an adiabatic passage between dressed states (that is, states of the molecule plus the radiation field) [1049, 1050]. 

F. Legare, S. CheUtowski, A.D. Bandrauk, Preparation and alignment of highly vibra-tionally excited molecules by CARP chirped adiabatic Raman passage, Chem. Phys. Lett. 329 (2000) 469. 

Dong W, Xiao C, Wang T et al (2010) Transition-State Spectroscopy of Partial Wave Resonances in the F + HD Reaction. Science 327 1501-1502 Wang T, Yang T, Xiao C et al (2013) Highly Efficient Pumping of Vibrationally Excited HD Molecules via Stark-Induced Adiabatic Raman Passage. The Journal of Physical Chemistry Letters 4 368-371... 

Wang T, Yang TG, Xiao CL, Dai DX, Yang XM (2013) Highly efficient pumping of vibrationally excited HD molecules via stark-induced adiabatic Raman passage. J Phys Chem Lett 4 368... 

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