Stark-shift-chirped rapid-adiabatic-passage technique in tripod systems

• N. Shirkhanghah ^[1] ; M. Saadati-Niari ^[2] ; B. Nedaee-Shakarab ^[3]
  1. [1] Islamic Azad University, Khalkhal, Iran
  2. [2] University of Mohaghegh Ardabili, Ardabil, Iran
  3. [3] Islamic Azad University, Ardabil, Iran

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• Localización: Revista Mexicana de Física, ISSN-e 0035-001X, Vol. 67, Nº. 2, 2021, págs. 180-187
• Idioma: inglés
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• Resumen

  • We show that the technique of Stark-chirped rapid adiabatic passage (SCRAP) can be implemented in tripod quantum systems. We propose a robust scheme to create a coherent superposition of two ground states, in a tripod system, via the Stark-shift-chirped rapid adiabatic passage technique. The technique of tripod-SCRAP uses four laser pulses: an intense far-off-resonance Stark laser pulse modifies the transition frequency between the states by Stark shifting their energies and three nearly resonant pump, Stokes and control laser pulses that fractionally transfer the population between the ground states via the adiabatic passage. In our scheme, the pulse duration of the pump pulse must be larger than the pulse duration of the Stokes and control pulses, although with a smaller amplitude, and the atom encounters with the pump and Stokes laser pulses with counterintuitive pulse sequence (the Stokes pulse arrives before the rest of the pulses). This technique applies to one-photon as well as multiphoton transitions, and the two fields do not need to vanish simultaneously. Tripod-SCRAP can be a powerful alternative tool for f-STIRAP and tripod-STIRAP techniques, at least when inhomogeneous broadenings are included. This scheme is robust against variations of intensities of the laser pulses, of detunings from resonances, and the time delay between the pulses.