Field demonstration of distributed quantum sensing without post-selection
| Autor: | Zhao, Si-Ran, Zhang, Yu-Zhe, Liu, Wen-Zhao, Guan, Jian-Yu, Zhang, Weijun, Li, Cheng-Long, Bai, Bing, Li, Ming-Han, Liu, Yang, You, Lixing, Zhang, Jun, Fan, Jingyun, Xu, Feihu, Zhang, Qiang, Pan, Jian-Wei |
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| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | Phys. Rev. X 11, 031009 (2021) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevX.11.031009 |
| Popis: | 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. Comment: 8 pages, 5 figures |
| Databáze: | arXiv |
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