.png){kind=icon}
返回
Towards practical quantum metrology with photon counting
.png){kind=icon}
OA
AI
DOI：10.1038/npjqi.2016.23.png)
.png){kind=icon}
.png){kind=icon}
分享.png){kind=icon}
收藏
摘要
En 中文
Quantum metrology aims to realise new sensors operating at the ultimate limit of precision measurement. However, optical loss, the complexity of proposed metrology schemes and interferometric instability each prevent the realisation of practical quantum-enhanced sensors. To obtain a quantum advantage in interferometry using these capabilities, new schemes are required that tolerate realistic device loss and sample absorption. We show that loss-tolerant quantum metrology is achievable with photon-counting measurements of the generalised multi-photon singlet state, which is readily generated from spontaneous parametric downconversion without any further state engineering. The power of this scheme comes from coherent superpositions, which give rise to rapidly oscillating interference fringes that persist in realistic levels of loss. We have demonstrated the key enabling principles through the four-photon coincidence detection of outcomes that are dominated by the four-photon singlet term of the four-mode downconversion state. Combining state-of-the-art quantum photonics will enable a quantum advantage to be achieved without using post-selection and without any further changes to the approach studied here.
Keyword:
ENTANGLEMENT
INTERFERENCE
NUMBER
AI总结
对已上传原文的论文进行重点信息的提取，主要内容包括：简要概述、研究摘要、背景介绍、关键亮点、图文解析、展望与总结。
期刊
IF:
8.3
论文数:
1.4K
被引数:
8.1K
机构
引用论文
分享收藏Quantum optical metrology - the lowdown on high-N00N states量子光学计量学-high-N00N状态的下降.png)
CONTEMPORARY PHYSICS
CONTEMPORARY PHYSICSIF3.3
PREAI
分享收藏High-speed and high-efficiency travelling wave single-photon detectors embedded in nanophotonic circuitsNATURE COMMUNICATIONSOAAI
NATURE COMMUNICATIONSIF15.7
OAAI分享收藏
查看更多内容