Two-color ghost interference with photon pairs generated in hot atoms

TL;DR

This paper reports the experimental observation of two-photon ghost interference using photon pairs generated in hot atoms via non-degenerate four-wave mixing, highlighting potential applications in secure long-distance quantum communication.

Contribution

First demonstration of ghost interference with narrowband, non-degenerate photon pairs from hot atomic ensembles, advancing quantum communication technology.

Findings

Successful observation of ghost interference with hot atom generated photons

Photon pairs exhibit large frequency difference and narrow bandwidth

Potential for improved secure quantum communication

Abstract

We report on an experimental observation of a two-photon ghost interference experiment. A distinguishing feature of our experiment is that the photons are generated via a non-degenerated spontaneous four-wave mixing process in a hot atomic ensemble; therefore the photon has narrow bandwidth. Besides, there is a large difference in frequency between two photons in a pair. Our works may be important to achieve more secure, large transmission capacity long-distance quantum communication.