Single photon transfer controlled by excitation phase in a two-atom cavity system

TL;DR

This paper explores how the excitation phase in a two-atom cavity system influences single photon transfer, revealing phase-sensitive quantum interference effects that could enable photon storage and manipulation.

Contribution

It introduces a novel scheme demonstrating phase-controlled quantum interference effects in a two-atom cavity system for photon transfer and storage.

Findings

Photon transfer is highly sensitive to external excitation phases.

Atomic positions influence coupling constants and interference effects.

The scheme enables generation of long-lived dark states for photon storage.

Abstract

We investigate the quantum interference effects of single photon transfer in two-atom cavity system caused by external excitation phase. In the proposed system, two identical atoms (with different positions in the optical cavity) are firstly prepared into a timed state by an external single photon field. During the excitation, the atoms grasp different phases which depend on the spatial positions of the atoms in the cavity. Due to strong resonant interaction between two atoms and optical cavity mode the absorbed input photon can be efficiently transferred from the atoms to the resonant cavity mode. We show that the quantum transfer is highly sensitive to the external excitation phases of atoms and it leads to quantum interference effects on the cavity mode excitation. Besides, the quantum transfer is also influenced by the dipole-dipole interaction dependent to the atomic distance. In this system the atomic positions also determine the coupling constants between atoms and cavity mode which causes additional interference effects to the photon exchange between atoms and cavity. Based on the characteristics of excitation phase we find that it is a feasible scheme to generate long-lived dark state and it could be useful for storage and manipulation of single photon fields by controlling the excitation phase.