期刊
CHINESE PHYSICS B
卷 32, 期 10, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1674-1056/acc520
关键词
squeezed vacuum states; fiber Mach-Zehnder interferometer; optical precision measurement; 42.50.-p; 42.50.Dv
Stable low-frequency squeezed vacuum states were generated and used for phase and amplitude measurements, achieving quantum improvements beyond the shot-noise limit in certain frequency ranges. This study demonstrates the feasibility and potential applications of fiber-based quantum-enhanced sensors.
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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