ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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Quantum-enhanced optical precision measurement assisted by low-frequency squeezed vacuum states |
Guohui Kang(康国辉)1, Jinxia Feng(冯晋霞)1,2,†, Lin Cheng(程琳)1, Yuanji Li(李渊骥)1,2, and Kuanshou Zhang(张宽收)1,2 |
1 State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Opto-Electronics, Shanxi University, Taiyuan 030006, China; 2 Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China |
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Abstract Stable low-frequency squeezed vacuum states at a wavelength of 1550 nm were generated. By controlling the squeezing angle of the squeezed vacuum states, two types of low-frequency quadrature-phase squeezed vacuum states and quadrature-amplitude squeezed vacuum states were obtained using one setup respectively. A quantum-enhanced fiber Mach-Zehnder interferometer (FMZI) was demonstrated for low-frequency phase measurement using the generated quadrature-phase squeezed vacuum states that were injected. When phase modulation was measured with the quantum-enhanced FMZI, there were above 3 dB quantum improvements beyond the shot-noise limit (SNL) from 40 kHz to 200 kHz, and 2.3 dB quantum improvement beyond the SNL at 20 kHz was obtained. The generated quadrature-amplitude squeezed vacuum state was applied to perform low-frequency amplitude modulation measurement for sensitivity beyond the SNL based on optical fiber construction. There were about 2 dB quantum improvements beyond the SNL from 60 kHz to 200 kHz. The current scheme proves that quantum-enhanced fiber-based sensors are feasible and have potential applications in high-precision measurements based on fiber, particularly in the low-frequency range.
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Received: 14 November 2022
Revised: 13 February 2023
Accepted manuscript online: 17 March 2023
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PACS:
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42.50.-p
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(Quantum optics)
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42.50.Dv
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(Quantum state engineering and measurements)
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Fund: Project supported by the National Natural Science Foundation of China (Grant No. 62175135) and the Fundamental Research Program of Shanxi Province (Grant No. 202103021224025). |
Corresponding Authors:
Jinxia Feng
E-mail: fengjx@sxu.eud.cn
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Cite this article:
Guohui Kang(康国辉), Jinxia Feng(冯晋霞), Lin Cheng(程琳), Yuanji Li(李渊骥), and Kuanshou Zhang(张宽收) Quantum-enhanced optical precision measurement assisted by low-frequency squeezed vacuum states 2023 Chin. Phys. B 32 104204
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