On-chip quantum NOON state sensing for temperature and humidity

doi:10.1088/1674-1056/ad72e2

Abstract A maximal photon number entangled state, namely NOON state, can be adopted for sensing with a quantum enhanced precision. In this work, we designed silicon quantum photonic chips containing two types of Mach-Zehnder interferometers wherein the two-photon NOON state, sensing element for temperature or humidity, is generated. Compared with classical light or single photon case, two-photon NOON state sensing shows a solid enhancement in the sensing resolution and precision. As the first demonstration of on-chip quantum photonic sensing, it reveals the advantages of photonic chips for high integration density, small-size, stability for multiple-parameter sensing serviceability. A higher sensing precision is expected to beat the standard quantum limit with a higher photon number NOON state.

Keywords: quantum sensing NOON state photonic chip

Received: 17 July 2024
Revised: 23 August 2024
Accepted manuscript online: 23 August 2024

PACS:	03.67.-a	(Quantum information)
	42.50.Dv	(Quantum state engineering and measurements)
	42.82.-m	(Integrated optics)
	42.65.-k	(Nonlinear optics)

Fund: Project supported by the National Key R&D Program of China (Grant No. 2022YFF0712800) and Innovation Program for Quantum Science and Technology (Grant No. 2021ZD0301500).

Corresponding Authors: Ping Xu
E-mail: pingxu520@nju.edu.cn

Cite this article:

Weihong Luo(罗伟宏), Chao Wu(吴超), Yuxing Du(杜昱星), Chang Zhao(赵畅), Miaomiao Yu(余苗苗), Pingyu Zhu(朱枰谕), Kaikai Zhang(张凯凯), and Ping Xu(徐平) On-chip quantum NOON state sensing for temperature and humidity 2024 Chin. Phys. B 33 100305

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