Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Acta Physica Sinica

Research on experimental scheme based on non-critical squeezed light field detection

中国科学院国家授时中心,, 西安交通大学理学院,, 山西大学光电研究所,

Published Jan 1, 2021• 0 citations
Publisher

Abstract

压缩态光场作为一种重要的量子光源，在量子计算、量子通信、精密测量等领域有广泛的应用前景。在非临界压缩光场产生的理论预测中，阈值以上泵浦的简并光学参量振荡器（DOPO）产生横向空间分布为一阶厄米高斯模式的非临界压缩光场，具有对泵浦光功率波动鲁棒性的量子特性，因此在实验中具有重要的应用价值。然而该非临界压缩光场的横向幅角随机旋转，导致无法利用本底探针光对其压缩特性进行稳定的平衡零拍实验探测。本文提出利用DOPO同时产生的与压缩光场空间正交的明亮光场作为本底探针光的实验探测方案。理论分析表明，该方案虽然引入了真空噪声，但可以很好抵消压缩光场的空间模式随机旋转引入的探测输出动态波动，得到3dB的稳定探测结果，且对本底探针光的相位波动具有鲁棒性。因此该探测方案对于非临界压缩光场的实验研究具有重要的实用价值。

DOI
10.7498/aps.70.20211212

Related papers

Experimental scheme of non-critical squeezed light field detection

Peng Liu, Juan Li, Xiao Xiang +4 more

The squeezed state, as an important quantum resource, has great potential applications in quantum computing, quantum communication and precision measurement. In the noncritically squeezed light theory, the predicted noncritically squeezed light can be generated by breaking the spontaneous rotational symmetry occurring in a degenerate optical parametric oscillator (DOPO) pumped above threshold. The reliability of this kind of squeezing is crucially important, as its quantum performance is robust to the pump power in experiment. However, the detected squeezing degrades rapidly in detection, because the squeezed mode orientation diffuses slowly, resulting in a small mode mismatch during the homodyne detection. In this paper, we propose an experimentally feasible scheme to detect noncritically squeezing reliable by employing the spatial mode swapping technic. Theoretically, the dynamic fluctuation aroused by random mode rotation in the squeezing detection can be compensated for perfectly, and 3 dB squeezing can be achieved robustly even with additional vacuum noise. Our scheme makes an important step forward for the experimental generation of noncritically squeezed light.

Acta Physica Sinica•Dec 26, 2021•0 citations

Spectroscopy and imaging with quantum light

Pengcheng Fu, Yanzhi Zhang, Xingqi Xu +3 more

光谱测量与成像技术的进步，已成为生命科学与材料科学研究中的关键表征手段。然而，在针对光学响应微弱的样品（如低维材料、活体细胞等）进行实际观测时，高功率激发光往往引入显著经典噪声，并造成不可忽视的光致损伤，从而限制了光学测量的信噪比与应用范围。在此背景下，具备特殊量子统计特性的非经典光源（如纠缠光与压缩光）为实现超越经典极限的信噪比提升提供了极具潜力的解决方案。本文聚焦于量子增强光谱与成像领域，系统梳理了基于纠缠光与压缩光两类重要量子光源的最新研究进展。纠缠光凭借光子间的量子关联特性，在关联成像、非探测光子成像及超快干涉测量等应用中展现出卓越的抗噪声能力；而压缩光则通过压缩光场噪声，在位移传感、等离激元探测及非线性显微成像等方面显著提升了探测灵敏度与信噪比。本文进一步系统阐述了量子光源在提高信噪比、降低光致损伤、提升时间分辨率以及增强非线性转换效率等方面的独特优势，并分析了当前制约量子成像技术实用化的关键挑战，包括光源亮度低，系统损耗大等问题。最后，对该领域未来的发展方向进行了展望。

Acta Physica Sinica•Jan 1, 2026•0 citations

Measurement of low-frequency signal based on quantum-enhanced fiber Mach-Zehnder interferometer

Cheng Jian, Feng Jin-Xia, Yuanji Li +1 more

Generation of squeezed state at telecommunication wavelength has been recently a very interesting issue due to the lowest optical power attenuation of light at a wavelength of 1550 nm in a standard telecommunication fiber. The low-frequency vacuum squeezed state at 1550 nm in combination with fiber based interferometer offers the possibility to implement quantum precision measurement beyond standard quantum limit (SQL). In this paper, we experimentally realize a quantum-enhanced fiber Mach-Zehnder interferometer (FMZI) for measuring the low-frequency phase modulation signal by using low-frequency vacuum squeezing at 1550 nm. Firstly, the low-frequency vacuum squeezed state at the telecommunication wavelength of 1550 nm is generated by using a degenerate optical parametric oscillator (DOPO). The DOPO is a semi-monolithic construction based on a type I periodically poled KTiOPO4 (PPKTP) crystal and a concave mirror. The pump threshold of DOPO is 270 mW. When the pump power is 120 mW that is below the pump threshold of DOPO and the temperature of PPKTP is controlled at 34.8℃, a vacuum squeezing of 3 dB is generated at an analysis frequency range from 10 kHz to 500 kHz. The quadrature phase vacuum squeezing is obtained by locking the squeezed quadrature angle through using a coherent control scheme, in which two acousto-optic modulators are used to shift the frequency and produce the auxiliary beam acting as a coherent control field. Based on the constructed FMZI, a quantum-enhanced FMZI is realized by injecting the generated low-frequency vacuum squeezed state at 1550 nm into the vacuum channel of FMZI. The relative phase between two injected light fields is locked at π by using the Pound-Drever-Hall (PDH) locking technology, and the relative phase between light fields of its arms in FMZI is also locked at π/2 by using the PDH locking technology. When a phase modulation signal at the frequency of 500 kHz is loaded in the signal arm of FMZI, the noise power spectrum of the output from FMZI is measured by a balance homodyne detect system. A 2 dB quantum improvement beyond shot-noise-level at the frequency of 500 kHz is obtained experimentally by using the quantum-enhanced FMZI. The experimental results demonstrate a potential application in quantum precision measurement beyond the SQL based on fiber sensor technique.

Acta Physica Sinica•Jan 1, 2018•3 citations

Phase noise suppression technology enhanced by squeezed states

Zhang Wen-Hui, Huang Yu-Ye, Zhang Ruo-Tao

抑制激光的相位噪声对相位敏感精密测量意义重大，现有的反馈控制回路结合光学腔的经典抑噪手段受到了量子噪声和热布朗噪声的限制。针对经典反馈控制系统存在的抑噪瓶颈，本研究提出了一种利用量子资源优势的解决方案，即通过将量子压缩态光场引入相位噪声经典反馈环路，构建一种压缩增强型的相位噪声反馈控制系统。该方案的物理基础是压缩态光场能在不违反海森堡不确定性原理的前提下，实现低于量子标准极限的噪声水平，从而为突破经典噪声限制提供了可能。通过研究分析相位噪声经典反馈控制系统的降噪机理以及压缩增强的相位噪声反馈控制系统的降噪机理，揭示了压缩态光场的低噪声特性与提升相位噪声抑制水平之间的内在联系，实现了相位噪声抑制水平的巨大提升。本研究为相位噪声的分析与操控等应用研究提供基础，推动相位敏感精密测量领域的发展。

Acta Physica Sinica•Jan 1, 2026•0 citations

Quantum features in a semiconductor microcavity with optical parametric oscillator and input squeezed field

Kidus Yosef, Desalegn Ayehu

Abstract In this paper we present a theoretical analysis of a scheme to enhance quantum statistical features of fluorescent light generated by a quantum well coupled to a degenerate optical parametric oscillator (DOPO) in a microcavity with an input squeezed field. We derive the quantum Langevin equations and solve them using Laplace transform method in the strong coupling regime. It is found that the intensity of the light is significantly enhanced while the normalized intensity spectrum remains largely unaffected by the external squeezed field. Additionally, the emitted light exhibits photon bunching, and the squeezing is notably improved, with the quadrature variance asymptotically approaching zero as the squeezing parameter increases. We also study the quadrature squeezing of the cavity mode and we show that a semiconductor microcavity can serve as a typical source of cavity mode squeezing, with the amount of squeezing significantly enhanced by the DOPO and the external squeezed field.

Physica Scripta•Jul 17, 2025•1 citation

Strong-field-induced quantum coherent emission and its applications

ZHAO Jing, LIU Yi, WU Cheng-Yin +2 more

近年来，强场物理与量子光学两个领域交叉产生的物理效应正逐步成为研究热点。融合超快宽谱激发与共振调控，可在亚周期内制备电子-电子、电子-离子多体纠缠与相干，进而产生强场相干性诱导的空气激光、超连续辐射与自由感应衰变等新型相干辐射。本文围绕强场量子光学这一新兴交叉领域，聚焦强场下量子相干辐射及应用，综述其理论基础、物理机制及潜在应用等方面的现状和挑战。期望以此推动开放系统多体强场量子光学的理论与实验研究，以及对多自由度强场量子相干性建立、演化与弛豫规律的探索，拓展强场量子相干辐射与放大机制，为构建时-频-空稳定可控的新型辐射源、发展远程探测新技术、实现空气激光在痕量分子检测与燃烧诊断等方面的应用提供参考。

Acta Physica Sinica•Sep 4, 2026•0 citations
压缩态光场作为一种重要的量子光源，在量子计算、量子通信、精密测量等领域有广泛的应用前景。在非临界压缩光场产生的理论预测中，阈值以上泵浦的简并光学参量振荡器（DOPO）产生横向空间分布为一阶厄米高斯模式的非临界压缩光场，具有对泵浦光功率波动鲁棒性的量子特性，因此在实验中具有重要的应用价值。然而该非临界压缩光场的横向幅角随机旋转，导致无法利用本底探针光对其压缩特性进行稳定的平衡零拍实验探测。本文提出利用DOPO同时产生的与压缩光场空间正交的明亮光场作为本底探针光的实验探测方案。理论分析表明，该方案虽然引入了真空噪声，但可以很好抵消压缩光场的空间模式随机旋转引入的探测输出动态波动，得到3dB的稳定探测结果，且对本底探针光的相位波动具有鲁棒性。因此该探测方案对于非临界压缩光场的实验研究具有重要的实用价值。
The squeezed state, as an important quantum resource, has great potential applications in quantum computing, quantum communication and precision measurement. In the noncritically squeezed light theory, the predicted noncritically squeezed light can be generated by breaking the spontaneous rotational symmetry occurring in a degenerate optical parametric oscillator (DOPO) pumped above threshold. The reliability of this kind of squeezing is crucially important, as its quantum performance is robust to the pump power in experiment. However, the detected squeezing degrades rapidly in detection, because the squeezed mode orientation diffuses slowly, resulting in a small mode mismatch during the homodyne detection. In this paper, we propose an experimentally feasible scheme to detect noncritically squeezing reliable by employing the spatial mode swapping technic. Theoretically, the dynamic fluctuation aroused by random mode rotation in the squeezing detection can be compensated for perfectly, and 3 dB squeezing can be achieved robustly even with additional vacuum noise. Our scheme makes an important step forward for the experimental generation of noncritically squeezed light.
光谱测量与成像技术的进步，已成为生命科学与材料科学研究中的关键表征手段。然而，在针对光学响应微弱的样品（如低维材料、活体细胞等）进行实际观测时，高功率激发光往往引入显著经典噪声，并造成不可忽视的光致损伤，从而限制了光学测量的信噪比与应用范围。在此背景下，具备特殊量子统计特性的非经典光源（如纠缠光与压缩光）为实现超越经典极限的信噪比提升提供了极具潜力的解决方案。本文聚焦于量子增强光谱与成像领域，系统梳理了基于纠缠光与压缩光两类重要量子光源的最新研究进展。纠缠光凭借光子间的量子关联特性，在关联成像、非探测光子成像及超快干涉测量等应用中展现出卓越的抗噪声能力；而压缩光则通过压缩光场噪声，在位移传感、等离激元探测及非线性显微成像等方面显著提升了探测灵敏度与信噪比。本文进一步系统阐述了量子光源在提高信噪比、降低光致损伤、提升时间分辨率以及增强非线性转换效率等方面的独特优势，并分析了当前制约量子成像技术实用化的关键挑战，包括光源亮度低，系统损耗大等问题。最后，对该领域未来的发展方向进行了展望。
Generation of squeezed state at telecommunication wavelength has been recently a very interesting issue due to the lowest optical power attenuation of light at a wavelength of 1550 nm in a standard telecommunication fiber. The low-frequency vacuum squeezed state at 1550 nm in combination with fiber based interferometer offers the possibility to implement quantum precision measurement beyond standard quantum limit (SQL). In this paper, we experimentally realize a quantum-enhanced fiber Mach-Zehnder interferometer (FMZI) for measuring the low-frequency phase modulation signal by using low-frequency vacuum squeezing at 1550 nm. Firstly, the low-frequency vacuum squeezed state at the telecommunication wavelength of 1550 nm is generated by using a degenerate optical parametric oscillator (DOPO). The DOPO is a semi-monolithic construction based on a type I periodically poled KTiOPO4 (PPKTP) crystal and a concave mirror. The pump threshold of DOPO is 270 mW. When the pump power is 120 mW that is below the pump threshold of DOPO and the temperature of PPKTP is controlled at 34.8℃, a vacuum squeezing of 3 dB is generated at an analysis frequency range from 10 kHz to 500 kHz. The quadrature phase vacuum squeezing is obtained by locking the squeezed quadrature angle through using a coherent control scheme, in which two acousto-optic modulators are used to shift the frequency and produce the auxiliary beam acting as a coherent control field. Based on the constructed FMZI, a quantum-enhanced FMZI is realized by injecting the generated low-frequency vacuum squeezed state at 1550 nm into the vacuum channel of FMZI. The relative phase between two injected light fields is locked at π by using the Pound-Drever-Hall (PDH) locking technology, and the relative phase between light fields of its arms in FMZI is also locked at π/2 by using the PDH locking technology. When a phase modulation signal at the frequency of 500 kHz is loaded in the signal arm of FMZI, the noise power spectrum of the output from FMZI is measured by a balance homodyne detect system. A 2 dB quantum improvement beyond shot-noise-level at the frequency of 500 kHz is obtained experimentally by using the quantum-enhanced FMZI. The experimental results demonstrate a potential application in quantum precision measurement beyond the SQL based on fiber sensor technique.
抑制激光的相位噪声对相位敏感精密测量意义重大，现有的反馈控制回路结合光学腔的经典抑噪手段受到了量子噪声和热布朗噪声的限制。针对经典反馈控制系统存在的抑噪瓶颈，本研究提出了一种利用量子资源优势的解决方案，即通过将量子压缩态光场引入相位噪声经典反馈环路，构建一种压缩增强型的相位噪声反馈控制系统。该方案的物理基础是压缩态光场能在不违反海森堡不确定性原理的前提下，实现低于量子标准极限的噪声水平，从而为突破经典噪声限制提供了可能。通过研究分析相位噪声经典反馈控制系统的降噪机理以及压缩增强的相位噪声反馈控制系统的降噪机理，揭示了压缩态光场的低噪声特性与提升相位噪声抑制水平之间的内在联系，实现了相位噪声抑制水平的巨大提升。本研究为相位噪声的分析与操控等应用研究提供基础，推动相位敏感精密测量领域的发展。
Abstract In this paper we present a theoretical analysis of a scheme to enhance quantum statistical features of fluorescent light generated by a quantum well coupled to a degenerate optical parametric oscillator (DOPO) in a microcavity with an input squeezed field. We derive the quantum Langevin equations and solve them using Laplace transform method in the strong coupling regime. It is found that the intensity of the light is significantly enhanced while the normalized intensity spectrum remains largely unaffected by the external squeezed field. Additionally, the emitted light exhibits photon bunching, and the squeezing is notably improved, with the quadrature variance asymptotically approaching zero as the squeezing parameter increases. We also study the quadrature squeezing of the cavity mode and we show that a semiconductor microcavity can serve as a typical source of cavity mode squeezing, with the amount of squeezing significantly enhanced by the DOPO and the external squeezed field.
近年来，强场物理与量子光学两个领域交叉产生的物理效应正逐步成为研究热点。融合超快宽谱激发与共振调控，可在亚周期内制备电子-电子、电子-离子多体纠缠与相干，进而产生强场相干性诱导的空气激光、超连续辐射与自由感应衰变等新型相干辐射。本文围绕强场量子光学这一新兴交叉领域，聚焦强场下量子相干辐射及应用，综述其理论基础、物理机制及潜在应用等方面的现状和挑战。期望以此推动开放系统多体强场量子光学的理论与实验研究，以及对多自由度强场量子相干性建立、演化与弛豫规律的探索，拓展强场量子相干辐射与放大机制，为构建时-频-空稳定可控的新型辐射源、发展远程探测新技术、实现空气激光在痕量分子检测与燃烧诊断等方面的应用提供参考。