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International Conference on Emerging Trends in Electrical, Control, and Telecommunication Engineering (ETECTE)

Controlling Tunneling of Atoms Through aHigh-Quality Cavity Via an External Driving Field

Fazal Badshah, Qing He, Zeyun Shi, Haiyang Zhang, Jin Xie, Rahmatullah Rahmatullah, Muhammad Zain Yousaf, Muqaddar Abbas

Published Dec 2, 2022• 0 citations
Publisher

Abstract

In high quality micromaser cavities, we investigate the tunnelling and traversal of ultra-cold A-type three-level atoms. We specifically discuss how a coherent driving field affects the tunnelling atoms' traversal behaviour. Phase time, which is shown to be a suitable measure of atoms' transit time through a cavity, is affected by driving induced atomic coherence. For example, atomic coherence leads to negative phase times for atomic transmission on both the excited and ground levels. The phase tunnelling time also exhibits alternate subclassical and superclassical traversal tendencies depending on the driving field value as atomic momentum increases.

DOI
10.1109/etecte55893.2022.10007349

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The passage of ultracold three-level atoms through the potential induced by the vacuum cavity mode is discussed using cascade atomic configuration. We study the tunneling or traversal time of the ultracold atoms via a bimodal high-QQQ cavity. It is found that the phase time, which may be considered as a measure for the time required to traverse the cavity, exhibits superclassical and subclassical behaviors. Further, the dark states and interference effects in cascade atomic configuration may influence the passage time of the atom through the cavity.
In this paper, we study the tunneling and traversal of ultracold two-level atoms through the potential induced by the vacuum cavity mode. In particular, we discuss the effects of off-resonant interaction between the cavity mode and atomic transition on tunneling time of the ultracold atoms through a high-QQQ mazer cavity. The phase time which may be considered as an appropriate measure of the time required for the atom to cross the cavity, exhibits some interesting features in the presence of off-resonant interaction. For example, switching between the sub and superclassical behaviors in phase time occurs for proper choice of detuning. Similarly, negative phase time appears for the transmission of atoms in both excited and ground states in the presence of off-resonant interaction.