Field demonstration of distributed quantum sensing without post-selection

• URL: http://arxiv.org/abs/2011.02807v1
• Date: Thu, 5 Nov 2020 13:29:55 GMT
• Title: Field demonstration of distributed quantum sensing without post-selection
• Authors: Si-Ran Zhao, Yu-Zhe Zhang, Wen-Zhao Liu, Jian-Yu Guan, Weijun Zhang, Cheng-Long Li, Bing Bai, Ming-Han Li, Yang Liu, Lixing You, Jun Zhang, Jingyun Fan, Feihu Xu, Qiang Zhang, Jian-Wei Pan
• Abstract summary: Distributed quantum sensing can provide quantum-enhanced sensitivity beyond the shot-noise limit (SNL) We demonstrate distributed quantum sensing in field and show the unconditional violation of SNL up to 0.916 dB for the field distance of 240 m. The results represent an important step towards a practical quantum sensing network for widespread applications.
• Score: 24.025999298453666
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• 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.

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