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Journal of Contemporary Physics (Armenian Academy of Sciences)

Effective Full Population Transfer in M-System Using Scanning Technique

Artur Aleksanyan

Published Jan 1, 2021• 4 citations
Publisher

Abstract

Abstract In this work, a theoretical model of the full population transfer in a five-level M type system is demonstrated. The method is based on the technique of linear scanning of the frequency of the laser field close to the resonance frequency of the corresponding transition. A comparison of the full population transfer obtained with the chirping technique with the results obtained by the method, which is based on the adiabatic population transfer of atomic levels, is made. The results are obtained using numerical computations.

DOI
10.3103/s1068337221010035

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We describe a technique for totally transferring the population of a molecular vibronic level to another optically accessible level by chirped pulse absorption. The method can be applied even for nonvanishing angular momentum states where the Rabi frequencies for the transitions depend on the magnetic quantum number M of the states. The population of a large J initial state can be totally transferred to a J′=J+1 state by R branch transitions with linearly or circularly polarized light pulses with negative or positive frequency chirp if the bandwidth of the chirped pulse is sufficiently small. For an initial state with small J, having P(Q) and R transitions that are closely spaced in energy and within the chirped pulse bandwidth, the situation is complicated by the presence of transitions involving additional nearby J states which can participate in transitions induced by the chirped pulse. For positive frequency chirp, population can be totally transferred to the excited electronic state, whereas for the negative frequency chirp case the population distribution depends on the details of the energy levels and laser pulse. The technique can be employed to align and orient states in which not all the M states of the initial level are transferred to the same branch, but each M state is totally transferred from the initial state. Criteria for this type of population transfer and alignment and orientation are described and the conditions under which adiabatic passage is maintained are discussed.
Abstract Considering a two-level quantum system, we have proposed and represented a new approach for robust population transfer. In this scheme, the laser frequency has been swept in a finite time interval which simplifies the experimental limitations of the population transfer process. It is shown that using the Jaynes–Cummings model and engineering the coupling strength, the frequency sweeping range and its time interval, it is possible to achieve a robust, stable and full population transfer.
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Abstract We have proposed and demonstrated a fast and robust method of population transfer between two quantum states using a quadratically chirped laser source. Numerically solving the time-dependent Schrödinger equation, transition probabilities have been obtained and the condition of the adiabatic passage is investigated. In this scheme, the wavelength of a laser source is quadratically swept in time to arbitrarily engineer the transition probabilities. The results show that complete and robust population transfer could be achieved by appropriate adjusting of the system parameters including the laser chirping parameter, the center frequency, and the coupling strength. Using this method, the time of the complete transition could be drastically decreased compared to the incorporation of the traditional linearly chirped laser.