Stimulated Raman adiabatic passage via bright state in Λ medium of unequal oscillator strengths

Abstract

We consider the population transfer process in a Λ-type atomic medium of unequal oscillator strengths by stimulated Raman adiabatic passage via bright-state (b-STIRAP) taking into account propagation effects. Using both analytic and numerical methods we show that the population transfer efficiency is sensitive to the ratio qp/qs of the transition oscillator strengths. We find that the case qp > qs is more detrimental for population transfer process as compared to the case where qp qs. For this case it is possible to increase medium dimensions while permitting efficient population transfer. A criterion determining the interaction adiabaticity in the course of propagation process is found. We also show that the mixing parameter characterizing the population transfer propagates superluminally.

Experimental observation of double coherent stimulated Raman adiabatic passages in three-levelΛsystems in a cold atomic ensemble

“…All of these experiments show that STIRAP is insensitive to the frequency jitter and amplitude fluctuations. In three-level systems with small or zero single-photon detuning, the excited state will be populated in the intuitive-pulse duration [16,[19][20][21]. Thus the spontaneous radiation from the excited state is inevitable, leading to a reduction of transfer efficiency.…”

Robust switching of superposition-states via a coherent double stimulated Raman adiabatic passage

“…The existence of a proper steady state can not guarantee a perfect practical evolution towards the target state unless the adiabatic condition is also fulfilled. Accounting for the basic concept of adiabaticity [34] that requires the change of quantum state to be much slower than the energy difference between the target and its nearest eigenstates, a global form of adiabatic criterion is readily given by [35]…”

Selective excitation of vibrational states in three-state Na2 molecule by a chirped laser pulse

“…Population transfer and coherent control of quantum states have been the subject of many theoretical and experimental studies. Various schemes [1][2][3][4][5][6][7] for controlling population transfer have been proposed over the years. The stimulated Raman adiabatic passage (STIRAP) [4,5] and chirped adiabatic passage [6,7] have played an important role in the development of controlling population transfer.…”

“…Various schemes [1][2][3][4][5][6][7] for controlling population transfer have been proposed over the years. The stimulated Raman adiabatic passage (STIRAP) [4,5] and chirped adiabatic passage [6,7] have played an important role in the development of controlling population transfer. The STIRAP uses partially overlapping pump and Stokes laser pulses to transfer the molecular population adiabatically from a specified initial state to a final target state in a Λ system.…”