Dissipation-induced geometric phase for an atom in cavity QED

TL;DR

This paper proposes a method to observe a geometric phase in an atom within cavity QED, induced by engineered decay processes, and demonstrates how it can be measured via atomic Ramsey interference.

Contribution

It introduces a feasible scheme to generate and detect geometric phases in cavity QED systems through engineered dissipation and adiabatic parameter changes.

Findings

Geometric phase can be induced by cavity photon loss.

The phase is observable via Ramsey interference.

The system remains in a decoherence-free subspace.

Abstract

We present a feasible scheme to investigate the geometric phase for an atom trapped in an optical cavity induced by the effective decay process due to cavity photon loss. The cavity mode, together with the external driving fields, acts as the engineered environment of the atom. When the parameters of the reservoir is adiabatically and cyclically changed, the system initially in the nontrivial dark state of the effective Lindblad operator undergoes a cyclic evolution and acquires a geometric phase. The geometric phase can be observed with the atomic Ramsey interference oscillation in the decoherence-free subspace.