We adapt nonlinear stimulated Raman exact passage (NL-STIREP) technique first proposed by Dorier etal. [Phys. Rev. Lett. 119, 243902 (2017)] to fractional population transfer in configurations and extend itto nonlinear N-pod systems. We use NLF-STIRAP technique in a system and indicate that, NLF-STIREPtechnique can guide the dynamics of the system as efficiently as a NLF-STIRAP but with considerably smallerRabi frequency amplitudes. We implement NLF-STIREP technique in fractional creation of ground molecularBose-Einstein condensates (BECs) from atomic BECs and show that, this technique is robust with respect tochanges in the time delay between the pulses and pulse intensity.
We propose the use of Stark chirped rapid-adiabatic-passage (SCRAP) method to induce a complete population transfer in a nonlinear three-level Λ-type system (nl-SCRAP). We also use the nl-SCRAP method for creating stable diatomic ground molecular Bose-Einstein condensates (BECs) from atomic BECs. In this three-laser technique the pump and Stokes pulses are slightly detuned from transition frequencies, and a third strong hyperbolic-tangent laser pulse induces dynamic Stark shifts of the relevant transitions and compensates third order nonlinearities. If the timing of the three pulses is appropriately chosen, the nonlinear quantum system is prepared to almost complete population inversion between the two lower states in the Λ-like scheme. The paper shows that the efficiency of the nl-SCRAP is higher than the nonlinear stimulated Raman adiabatic passage (nl-STIRAP) technique, and this method can be used in one-photon as well as multi-photon transitions. The transfer process is robust concerning fluctuations of experimental parameters, such as peak Rabi frequencies, the time delay between pulses, and static detunings.
Polarization of K * in the rare B → K * + − decay governed by the quark level transitions b → s, are investigated in the fourth quark generation model popularly known as SM4. We find that in this model due to the additional contributions coming from the heavy t quark in the loop, the observables related to the polarization of K * deviate significantly from their SM values. Some of the physical observables are within the reach of LHCb experiment and search for such channels are strongly argued.
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