Efficient Population Transfer in a Λ‐Type Quantum System Coupled to a Gold Nanoparticle Using STIRAP Shortcuts. Issue 2 (14th December 2022)

• Record Type: Journal Article
• Authors: Domenikou, Natalia; Thanopulos, Ioannis; Stefanatos, Dionisis; Yannopapas, Vassilios; Paspalakis, Emmanuel
• Is Part Of: Annalen der Physik. Volume 535:Issue 2(2023)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-12-14
• Subjects: Λ‐type quantum systems -- coherent population transfer -- gold plasmonic nanoparticles -- semiconductor quantum dot -- stimulated Raman adiabatic passage shortcut; Physics -- Periodicals; Chemistry -- Periodicals; 530.05
• DOI: 10.1002/andp.202200478
• Languages: English
• ISSNs: 0003-3804

Abstract

Abstract: A theoretical investigation on the population transfer in a Λ‐type quantum system near a spherical gold nanoparticle under application of two stimulated Raman adiabatic passage (STIRAP) shortcuts and efficiency comparison with conventional STIRAP. It combines the density matrix approach for system dynamics, with classical electromagnetic calculations used to obtain the modified electric field amplitudes of the applied pulses and the Purcell factor of the quantum system due to the presence of the nanoparticle. The efficiency of population transfer is investigated by varying the distance between the quantum system and the nanoparticle, the free‐space decay rate of quantum states, the mutual polarization, and the Rabi frequencies of each STIRAP shortcut pulses. In all cases, at least one of the applied shortcuts is more efficient than conventional STIRAP, while in most cases both perform better. When the pump and Stokes fields of the shortcuts have radial and tangential polarizations with respect to the nanoparticle surface, respectively, high transfer efficiency is obtained for small distances of the quantum system to the nanoparticle, moderate free space decay rates and large Rabi frequencies of the fields, while when the pulse polarizations are interchanged, the transfer becomes highly efficient only at large distances. Abstract : A Λ‐type quantum system is placed close to a gold nanoparticle and population transfer efficiency to the third energy level is plotted against the field amplitude, for different polarizations of the pump and Stokes fields. In both cases, an improvement is observed when using shortcuts to adiabaticity pulses (dashed lines) instead of conventional stimulated Raman adiabatic passage pulses (solid lines).