Telecom-wavelength conversion in a high optical depth cold atomic system

Author:

Zhang Wei-Hang,Ye Ying-Hao1,Zeng Lei,Dong Ming-Xin1,Li En-ZeORCID,Peng Jing-Yuan,Li YanORCID,Ding Dong-Sheng,Shi Bao-Sen

Affiliation:

1. Hefei Normal University

Abstract

We experimentally investigate the frequency down-conversion through the four-wave mixing (FWM) process in a cold 85Rb atomic ensemble, with a diamond-level configuration. An atomic cloud with a high optical depth (OD) of 190 is prepared to achieve a high efficiency frequency conversion. Here, we convert a signal pulse field (795 nm) attenuated to a single-photon level, into a telecom light at 1529.3 nm within near C-band range and the frequency-conversion efficiency can reach up to 32%. We find that the OD is an essential factor affecting conversion efficiency and the efficiency may exceed 32% with an improvement in the OD. Moreover, we note the signal-to-noise ratio of the detected telecom field is higher than 10 while the mean signal count is larger than 0.2. Our work may be combined with quantum memories based on cold 85Rb ensemble at 795 nm and serve for long-distance quantum networks.

Funder

National Key Research and Development Program of China

National Natural Science Foundation of China

Youth Innovation Promotion Association of the Chinese Academy of Sciences

Major Science and Technology Projects in Anhui Province

Publisher

Optica Publishing Group

Subject

Atomic and Molecular Physics, and Optics

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