Spontaneous emission in stimulated Raman adiabatic passage

Abstract

This work explores the effect of spontaneous emission on the population transfer efficiency in stimulated Raman adiabatic passage ͑STIRAP͒. The approach uses adiabatic elimination of weakly coupled density matrix elements in the Liouville equation, from which a very accurate analytic approximation is derived. The loss of population transfer efficiency is found to decrease exponentially with the factor ⍀ 0 2 / ⌫, where ⌫ is the spontaneous emission rate and ⍀ 0 is the peak Rabi frequency. The transfer efficiency increases with the pulse delay and reaches a steady value. For large pulse delay and large spontaneous emission rate STIRAP degenerates into optical pumping.

Optimization of STIRAP-based state transfer under dissipation

“…Past work on the optimization of STIRAP for atomic population transfer was performed in the absence of decoherence, with the objective of reducing the non-adiabatic leakage and minimizing the pulse area or duration [30]. Other studies considered the effect of dissipation by including decoherence of the intermediate level [31][32][33][34], thus the crucial trade-off between decoherence and adiabaticity was not taken into consideration.…”

“…Those treatments are often within a phenomenological approach [32,35]. In studies of STIRAP in solid-state systems, the dissipation is numerically simulated (see e.g.…”

Stimulated Raman adiabatic passage in aΛsystem in the presence of quantum noise

“…Then, after considering the resolution of the master equation, we compare the predictions coming from our model with the results coming from the phenomenological description of an analogous decay scheme [12]. We find that the efficiency of the STIRAP process is higher than predicted before.…”

“…The loss of efficiency caused by external decay is more detrimental for it leads to irreversible population loss from the system; it is also easier to describe and understand [11,13]. The effect of internal decay on STIRAP is a much more subtle effect because the loss of efficiency is compensated by the concomitant optical pumping [12]. Here we develop a rigorous microscopic theory of internal decay in STIRAP and b-STIRAP, which reveals some unexpected features compared to the phenomenological model [12].…”

Enhancing the sensitivity and robustness of label-free imaging systems via stimulated Raman adiabatic passage

“…The detunings of the pump and Stokes laser frequencies can be written as p = ω 21 − ω p and s = ω 23 − ω s . Following Ivanov et al [15], the effects of spontaneous decay from level |2 to levels |1 and |3 may be modeled via the Liouville equation…”