Influence of the asymmetric excited state decay on coherent population trapping

Author(s)

Borges, H. S. ; Oliveira, M. H. ; Villas-Boas, C. J.

• Document type: Journal article
• Source: SCIENTIFIC REPORTS; v. 7, AUG 2 2017.
• Web of Science Citations: 3

Abstract

Electromagnetically induced transparency (EIT) is an optical phenomenon which allows a drastic modification of the optical properties of an atomic system by applying a control field. It has been largely studied in the last decades and nowadays we can find a huge number of experimental and theoretical related studies. Recently a similar phenomenon was also shown in quantum dot molecules (QDM), where the control field is replaced by the tunneling rate between quantum dots. Our results show that in the EIT regime, the optical properties of QDM and the atomic system are identical. However, here we show that in the strong probe field regime, i.e., ``coherent population trapping{''} (CPT) regime, it appears a strong discrepancy on the optical properties of both systems. We show that the origin of such difference relies on the different decay rates of the excited state of the two systems, implying in a strong difference on their higher order nonlinear susceptibilities. Finally, we investigate the optical response of atom/QDM strongly coupled to a cavity mode. In particular, the QDM-cavity system has the advantage of allowing a better narrowing of the width of the dark state resonance in the CPT regime when compared with atom-cavity system. (AU)

• FAPESP's process: 13/04162-5 - Development of quantum sensors based on ultracold atoms
• Grantee: Philippe Wilhelm Courteille
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 14/12740-1 - Quantum memory and cavity electrodynamics in quantum dots coupled by tunneling
• Grantee: Halyne Silva Borges
• Support Opportunities: Scholarships in Brazil - Post-Doctoral