Non-classical field state stabilization in a cavity by reservoir engineering

TL;DR

This paper introduces a reservoir engineering method using a sequence of atom-cavity interactions to stabilize non-classical states, such as squeezed states and superpositions, in a cavity with finite damping, enhancing quantum state protection.

Contribution

It presents a novel reservoir engineering approach that stabilizes non-classical cavity states through tailored atom-cavity interactions involving dispersive and resonant phases.

Findings

Successfully stabilizes squeezed states and superpositions in a cavity.

Robust method compatible with current experimental setups.

Provides insights into protecting mesoscopic quantum states from decoherence.

Abstract

We propose an engineered reservoir inducing the relaxation of a cavity field towards non-classical states. It is made up of two-level atoms crossing the cavity one at a time. Each atom-cavity interaction is first dispersive, then resonant, then dispersive again. The reservoir pointer states are those produced by an effective Kerr Hamiltonian acting on a coherent field. We thereby stabilize squeezed states and quantum superpositions of multiple coherent components in a cavity having a finite damping time. This robust method could be implemented in state-of-the-art experiments and lead to interesting insights into mesoscopic quantum state superpositions and into their protection against decoherence.