Control of atomic decay rates via manipulation of reservoir mode frequencies

TL;DR

This paper demonstrates that by rapidly chirping the frequencies of reservoir modes, one can significantly control atomic decay rates, enabling both inhibition and enhancement of atomic decay even with a fixed reservoir structure.

Contribution

The study introduces a method to manipulate atomic decay by fast reservoir mode chirping, revealing new possibilities for controlling atom-reservoir interactions.

Findings

Fast reservoir mode chirping can inhibit atomic decay.

Rapid chirping can enhance atomic decay beyond the natural rate.

Partial atomic population trapping is achievable with moderate chirps.

Abstract

We analyse the problem of a two-level atom interacting with a time-dependent dissipative environment modelled by a bath of reservoir modes. In the model of this paper the principal features of the reservoir structure remain constant in time, but the microscopic structure does not. In the context of an atom in a leaky cavity this corresponds to a fixed cavity and a time-dependent external bath. In this situation we show that by chirping the reservoir modes sufficiently fast it is possible to inhibit, or dramatically enhance the decay of the atomic system, even though the gross reservoir structure is fixed. Thus it is possible to extract energy from a cavity-atom system faster than the empty cavity rate. Similar, but less dramatic effects are possible for moderate chirps where partial trapping of atomic population is also possible.