Field demonstration of distributed quantum sensing without post-selection
Abstract
Distributed quantum sensing can provide quantum-enhanced sensitivity beyond the shot-noise limit (SNL) for sensing spatially distributed parameters. To date, distributed quantum sensing experiments have been mostly accomplished in laboratory environments without a real space separation for the sensors. In addition, the post-selection is normally assumed to demonstrate the sensitivity advantage over the SNL. Here, we demonstrate distributed quantum sensing in field and show the unconditional violation (without post-selection) of SNL up to 0.916 dB for the field distance of 240 m. The achievement is based on a loophole free Bell test setup with entangled photon pairs at the averaged heralding efficiency of 73.88%. Moreover, to test quantum sensing in real life, we demonstrate the experiment for long distances (with 10-km fiber) together with the sensing of a completely random and unknown parameter. The results represent an important step towards a practical quantum sensing network for widespread applications.
Keywords
Cite
@article{arxiv.2011.02807,
title = {Field demonstration of distributed quantum sensing without post-selection},
author = {Si-Ran Zhao and Yu-Zhe Zhang and Wen-Zhao Liu and Jian-Yu Guan and Weijun Zhang and Cheng-Long Li and Bing Bai and Ming-Han Li and Yang Liu and Lixing You and Jun Zhang and Jingyun Fan and Feihu Xu and Qiang Zhang and Jian-Wei Pan},
journal= {arXiv preprint arXiv:2011.02807},
year = {2021}
}
Comments
8 pages, 5 figures