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

Dong-Sheng Ding,Guang-Can Guo,Zhi-Yuan Zhou,Bao-Sen Shi,Xu-Bo Zou

doi:10.1063/1.4754857

Dong-Sheng Ding, Guang-Can Guo + Show 3 more

Open Access

https://doi.org/10.1063/1.4754857

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Journal: AIP Advances	Publication Date: Sep 1, 2012
Citations: 8	License type: cc-by

Affiliation: University of Science and Technology of China

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.

Highlights

Parametric down-conversion (SPDC) in a nonlinear crystal[1,2] as an efficient and widely used way of generating an entangled two-photon state, has been used in many interesting experiments.[3,4,5] Some of the most intriguing effects of a two-photon entangled state are quantum ghost interference and imaging,[6,7] the spatial non-classical correlation, such as transverse position and momentum, is used in these phenomena
Another way for generating a photon pair, based on spontaneously Raman scattering (SRS)[11,12] or spontaneous four-wave mixing (SFWM)[13,14,15] in an atomic ensemble, attracts peoples attentions due to the fact that the photon generated by this way has very narrow bandwidth
The non-classical temporal correlation between the photons generated through SRS or SFWM has been studied in many experiments,[16,17,18] there is no any report about the spatial correlation between the photons

Summary

Introduction

Parametric down-conversion (SPDC) in a nonlinear crystal[1,2] as an efficient and widely used way of generating an entangled two-photon state, has been used in many interesting experiments.[3,4,5] Some of the most intriguing effects of a two-photon entangled state are quantum ghost interference and imaging,[6,7] the spatial non-classical correlation, such as transverse position and momentum, is used in these phenomena. Two-color ghost interference with photon pairs generated in hot atoms We experimentally investigate the spatial correlation by performing a ghost interference experiment.

Results

Conclusion