# Phase-dependent quantum correlation in cavity-atom system

## TL;DR

This paper introduces a phase-controlled scheme to manipulate quantum correlations of output light in a cavity-atom system, enabling steady and maximized quantum correlations through phase adjustments.

## Contribution

It presents a novel method to control quantum correlations in cavity-atom systems using phase manipulation of driving fields and probe beams.

## Key findings

- Quantum correlation can be tuned via phase control.
- The scheme achieves steady and maximum quantum correlations.
- Potential for entanglement generation in cavity-atom systems.

## Abstract

We propose a scheme to manipulate quantum correlation of output lights from two sides of a cavity by phase control. A probe laser is set to split into two beams in an interferometer with a relative phase in two arms which drive the cavity mode in opposite directions along cavity axis, individually. This phase, here named as driving-field phase, is important to build up quantum correlation in HBT (Hanbury Brown-Twiss) setup. Three control lasers propagate vertically to the cavity axis and drive the corresponding atomic transitions with a closed-loop phase. This type of closed-loop phase has been utilized to realize quantum correlation and even quantum entanglement of the atomic system in previous work [Phys. Rev. A 81 033836 (2010)]. The scheme here is useful to manipulate steady and maximum quantum correlation.