Coherence Induced by Incoherent Pumping Field and Decay Process in Three-level $\Lambda$ Type Atomic System

TL;DR

This paper investigates how incoherent pumping and decay processes induce coherence in a three-level atomic system, revealing stable and unstable steady states with potential applications in quantum optics.

Contribution

It demonstrates the existence of distinct steady states, including stable and unstable configurations, induced by incoherent pumping and decay in a three-level atomic system.

Findings

Identification of coherent population trapping state.

Discovery of stable and unstable steady states ('singlet' and 'triplet').

Potential applications in quantum optics and interference.

Abstract

Following the method of Victor V. Kozlov et al.[PhysRevA. 74. 063829],we inspect the coherence induced by incoherent pump and spontaneous decay process in $\Lambda$ type three-level atomic system with degenerated lower duplicate levels. The system shows a coherent population trapping state and multi-steady states characteristic in different conditions. Interestingly, two kinds of steady states generated by the system in different sets of pumping and decaying parameters, the "singlet" state and the "triplet" state, exhibit stable or unstable characteristics under the action of pumping field and vacuum reservoir, which promise fruitful applications to atomic coherence and interference in quantum optics.