Article
Optics
Yaohua Li, An-Ning Xu, Long-Gang Huang, Yong-Chun Liu
Summary: In this study, a detuning-switched method is proposed to generate strong and stationary mechanical squeezing quickly. The pulsed driving can transform optomechanical coupling into a linear optical force and maintain the effective mechanical frequency, resulting in strong mechanical squeezing within a short period of time. Moreover, the obtained strong mechanical squeezing can be frozen by increasing the pulse intervals, leading to stationary mechanical squeezing with a fixed squeezing angle. Therefore, our research provides fascinating insights and applications of modulated optomechanical systems.
Article
Optics
X. N. Feng, Jiahao Huang, L. F. Wei, Chaohong Lee
Summary: In this study, a scheme is proposed to suppress spin dephasing in a spin-oscillator system by squeezing the quantum fluctuation of the two-mode oscillator. It is shown that squeezing either on a single mode individually or on both modes simultaneously can effectively suppress spin dephasing.
Article
Physics, Multidisciplinary
Tian-Wei Mao, Qi Liu, Xin-Wei Li, Jia-Hao Cao, Feng Chen, Wen-Xin Xu, Meng Khoon Tey, Yi-Xiao Huang, Li You
Summary: A record enhancement in nonlinear interferometry has been achieved by using spin-nematic squeezed states of atomic Bose-Einstein condensates, which can have potential applications in atomic magnetometers, atomic clocks, and fundamental tests of Lorentz symmetry violations.
Article
Engineering, Environmental
Yong Suo, Quanwu Guo, Yutong Liao, Jianhong Luo
Summary: Inspired by mechanical reciprocating movement, an active microchannel device was designed for enhanced extraction and separation of Mn (II) using segmented flow and cavity squeezing technique. Experimental results showed that residence time was the main factor affecting extraction efficiency and the movement of the reciprocating plate produced a cyclic flow between oil and aqueous phases, enhancing mixing and contact area.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Optics
Ming-Song Ding, Li Zheng, Ying Shi, Yu-Jie Liu
Summary: We investigate the generation of entanglement in a cavity magnomechanical system, and find that introducing magnon squeezing enhances the entanglement between magnon-photon, magnon-phonon, and photon-phonon. There exists an optimal squeezing parameter that yields maximum entanglement. This study provides a new perspective on exploring quantum entanglement properties in cavity magnomechanical systems and has potential applications in quantum state engineering.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2022)
Article
Optics
Tian-Xiang Lu, Xing Xiao, Liu-Sha Chen, Qian Zhang, Hui Jing
Summary: In this study, the authors investigate the magnomechanically induced transparency effect in a cavity magnomechanical system, focusing on the role of magnon squeezing in enhancing and controlling the group delay of the transmitted light. They found that magnon squeezing strongly affects the magnon number and enables steerable transmission rate and controllable fast-to-slow light switching. Their results provide useful tools for engineering cavity magnomechanical devices with magnon squeezing for applications such as light propagation, storage, and precision measurements of weak signals.
Article
Multidisciplinary Sciences
Erik R. Eisenach, John F. Barry, Michael F. O'Keeffe, Jennifer M. Schloss, Matthew H. Steinecker, Dirk R. Englund, Danielle A. Braje
Summary: Overcoming poor readout in solid-state spin defect devices is becoming increasingly urgent, with rapid adoption in quantum sensing, quantum information, and fundamental physics tests. By coupling to a microwave cavity, high-fidelity room-temperature readout of nitrogen-vacancy centers was demonstrated, achieving magnetic sensitivity approaching the Johnson-Nyquist noise limit.
NATURE COMMUNICATIONS
(2021)
Article
Optics
Haitham A. R. El-Ella
Summary: This study theoretically explores the magnitude of quadrature squeezing in a cavity-coupled ensemble driven by a coherent off-axis field. Numerical calculations show that steady-state quadrature squeezing approaches a limit of -3 dB, while frequency-modulated quadrature squeezing approaches a limit of -14 dB, in different conditions. The impact of pure dephasing can be mitigated by increasing the detuning of the driving field, and frequency-modulated squeezing is only shielded under specific conditions.
Article
Quantum Science & Technology
Robin Corgier, Marco Malitesta, Augusto Smerzi, Luca Pezze
Summary: Differential configurations are crucial for phase and frequency estimation with atom interferometers due to their common-mode noise rejection. Our protocol treats differential interferometry as a distributed multiparameter estimation problem and takes advantage of both mode and particle entanglement. By optimizing mode swapping in a single spin-squeezed state among common interferometric modes, we achieve sub-SQL sensitivity for differential phase shift estimation.
Article
Engineering, Electrical & Electronic
Rajesh T. Keshwani, Siddhartha Mukhopadhyay, Ravindra D. Gudi, Gopal Joshi
Summary: This article focuses on estimating the detuning value ?? of an RF cavity using various approaches. Each approach has its advantages and limitations. The performance of the Kalman filter algorithm is evaluated using a 650 MHz RF cavity in the experiment. The adaptive Kalman filter (AKF) helps to assess the values of tuning parameters.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2023)
Article
Nanoscience & Nanotechnology
Valerio Di Giulio, F. Javier Garcia de Abajo
Summary: This study demonstrates that the ponderomotive contribution to the electron-cavity interaction can create a more general set of optical states, including coherent and squeezed states. These findings have important implications for quantum information and optics applications.
Article
Optics
Amjad Sohail, Rizwan Ahmed, Jia-Xin Peng, Aamir Shahzad, S. K. Singh
Summary: The study investigates a theoretically feasible scheme for enhancing entanglement between different partitions in a two-cavity magnomechanical system. It demonstrates that magnon squeezing significantly enhances entanglement between directly and indirectly coupled modes. The study also reveals the negative impact of the thermal bath on photon-phonon and magnon-phonon entanglement, and highlights the role of magnon squeezing in robustness against thermal effects. Furthermore, the tripartite entanglement among photon, magnon, and phonon is considerably enhanced. This system holds potential for quantum tasks requiring enhanced entanglement between indirectly coupled modes.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2023)
Article
Optics
Long-Gang Huang, Xuanchen Zhang, Yanzhen Wang, Zhenxing Hua, Yuanjiang Tang, Yong-Chun Liu
Summary: Spin squeezing is crucial for quantum metrology and quantum information science, but its generation faces challenges due to the lack of squeezing interactions in existing physical systems. In this study, we propose a universal scheme to generate spin squeezing in coupled spin models with collective spin-spin interactions. We can transform the coupled spin interactions into squeezing interactions and achieve extreme squeezing with Heisenberg-limited measurement precision scaling as 1/N for N particles. Only constant and continuous driving fields are required, making it accessible for current realistic experiments. This work greatly expands the systems capable of generating Heisenberg-limited spin squeezing, with broad applications in quantum precision measurement.
Article
Optics
Tommaso Roscilde, Fabio Mezzacapo, Tommaso Comparin
Summary: The research proves two simple theorems about squeezing induced by bilinear spin-spin interactions that conserve spin parity, which applies to the vast majority of quantum spin models implemented by state-of-the-art quantum simulators. It shows that squeezing captures the first form of quantum correlations whether they are produced at equilibrium or away from equilibrium by manipulating the spin-spin interactions.
Article
Chemistry, Multidisciplinary
Xiao-Dong Zeng, Yuan-Ze Yang, Nai-Jie Guo, Zhi-Peng Li, Zhao-An Wang, Lin-Ke Xie, Shang Yu, Yu Meng, Qiang Li, Jin-Shi Xu, Wei Liu, Yi-Tao Wang, Jian-Shun Tang, Chuan-Feng Li, Guang-Can Guo
Summary: In this study, a reflective dielectric cavity (RDC) structure was used to enhance the fluorescence intensity of negatively charged boron vacancy (VB-) spin defects in hexagonal boron nitride (hBN) significantly. This research contributes to the on-chip integration of spin defects in two-dimensional materials.
Article
Optics
Yue-Xun Huang, Ming Li, Zi-Jie Chen, Yan-Lei Zhang, Xu-Bo Zou, Guang-Can Guo, Chang-Ling Zou
Summary: Mean-field treatment (MFT) is commonly used for approximating the dynamics of quantum optics systems. However, neglecting quantum correlations between modes can lead to unexpected quantum effects. This study presents a theoretical framework based on perturbation theory and MFT to capture these effects and predicts the form and relationship of nonlinear dissipation, parasitic Hamiltonian, and nonlinear coupling rate. The framework is applied to quantum frequency conversion and shows excellent agreement with numerical simulations, revealing the neglected quantum effects by MFT and providing a more precise framework for nonlinear and quantum optics.
LASER & PHOTONICS REVIEWS
(2023)
Article
Optics
Qijing Lu, Lingqin Liao, Longxiang Chen, Junqiang Guo, Ya Hu, Yan-Lei Zhang, Chang-Ling Zou, Xiang Wu, Shusen Xie
Summary: This study investigates the interaction between a microcavity and liquid anisotropic molecules by filling an optofluidic microbubble resonator. Enhanced coupling between the optical mode and the rotation/vibration of molecules leads to the observation of stimulated scattering effects and the generation of quasi-supercontinuum.
LASER & PHOTONICS REVIEWS
(2023)
Article
Optics
Zhu-Bo Wang, Chenyue Gu, Xin-Xin Hu, Ya-Ting Zhang, Ji-Zhe Zhang, Gang Li, Xiao-Dong He, Xu-Bo Zou, Chun-Hua Dong, Guang-Can Guo, Chang-Ling Zou
Summary: In this study, the dynamics of single atoms in a modified optical dipole trap with a backward propagating dipole trap beam were experimentally investigated. The collision rate between two atoms was changed by six times. The theoretical model predicts high probabilities of few-atom loading rates under appropriate experimental conditions. This work provides an alternative approach for controlling the dynamics of a few atoms in a dipole trap and studying the collective quantum optical effects of few atoms.
Article
Multidisciplinary Sciences
Rui Niu, Ming Li, Shuai Wan, Yu Robert Sun, Shui-Ming Hu, Chang-Ling Zou, Guang-Can Guo, Chun-Hua Dong
Summary: The authors propose a universal mechanism to fully control microcombs and demonstrate a wavemeter with a precision of kHz. Microcombs offer a unique and compact solution for various photonics applications. The proposed mechanism stabilizes the microcomb frequency, enabling its use in wavelength measurement with high precision.
NATURE COMMUNICATIONS
(2023)
Article
Optics
Pengfei Yang, Ming Li, Xing Han, Hai He, Gang Li, Chang-Ling Zou, Pengfei Zhang, Yuhua Qian, Tiancai Zhang
Summary: Breaking the time-reversal symmetry of light is crucial for fundamental physics and has gained increasing attention in the study of non-reciprocal photonic devices. In this study, a chiral cavity quantum electrodynamics system with multiple atoms coupled to a Fabry-Perot cavity is experimentally demonstrated. By polarizing the internal quantum state of the atoms, the time-reversal symmetry of the atom-cavity interaction is broken. The strongly coupled atom-cavity system can be described by non-reciprocal quasiparticles called cavity polaritons.
LASER & PHOTONICS REVIEWS
(2023)
Article
Multidisciplinary Sciences
Zhongchu Ni, Sai Li, Xiaowei Deng, Yanyan Cai, Libo Zhang, Weiting Wang, Zhen-Biao Yang, Haifeng Yu, Fei Yan, Song Liu, Chang-Ling Zou, Luyan Sun, Shi-Biao Zheng, Yuan Xu, Dapeng Yu
Summary: Quantum error correction (QEC) protects logical qubits by using a large Hilbert space with redundancy to detect and correct errors in real time. In this study, a QEC procedure was demonstrated in a circuit quantum electrodynamics architecture, where a logical qubit was encoded in photon-number states of a microwave cavity and coupled to an auxiliary superconducting qubit. By applying a tailored frequency comb pulse, error syndrome was extracted and error correction was performed, exceeding the break-even point by about 16% lifetime enhancement. This work illustrates the potential of hardware-efficient discrete-variable encodings for fault-tolerant quantum computation.
Article
Optics
Hao Chen, Zhengyu Wang, Yan Wang, Changqiu Yu, Rui Niu, Chang-Ling Zou, Jin Lu, Chun-Hua Dong, Hongliang Ren
Summary: Whispering gallery mode (WGM) resonators are valuable for precise measurement due to their small size, high sensitivity, and fast response time. This study demonstrates that multimode sensing, utilizing multiple resonances, provides more Fisher information and can achieve better performance than single mode tracking. A temperature detection system based on a microbubble resonator is developed, and a machine learning algorithm is employed to predict unknown temperatures with high accuracy and a large dynamic range.
Article
Physics, Applied
Yuan-Hao Yang, Xin-Biao Xu, Jia-Qi Wang, Mai Zhang, Ming Li, Zheng-Xu Zhu, Zhu-Bo Wang, Chun-Hua Dong, Wei Fang, Huakang Yu, Guang-Can Guo, Chang-Ling Zou
Summary: This study investigates the nonlinear coupling between on-chip confined optical modes and free-space continuum modes. The experiment observed the radiation of second-harmonic wave caused by pump fields in integrated lithium niobate microcavities. The mechanism of nonlinear optical radiation (NOR) is further verified by demonstrating the difference frequency generation between a free-space input and an on-chip pump field. The revealed mechanism of NOR has universal applicability for dielectric photonic integrated devices, allowing for spatial engineering of optical fields and light sources.
PHYSICAL REVIEW APPLIED
(2023)
Article
Physics, Applied
Y. A. Yang, T. A. Zheng, S. -z. Wang, W. -k. Hu, Chang-Ling Zou, T. Xia, Z. -t. Lu
Summary: Quantum nondemolition (QND) measurement enhances detection efficiency and measurement fidelity in precision measurements and quantum information processing. A QND measurement scheme is proposed and demonstrated for the spin states of laser-trapped atoms. This approach utilizes a circularly polarized control laser to create a cycling, spin-selective, and spin-preserving transition on 171Yb atoms in an optical dipole trap.
PHYSICAL REVIEW APPLIED
(2023)
Editorial Material
Multidisciplinary Sciences
Zijie Chen, Luyan Sun, Chang-Ling Zou
Article
Quantum Science & Technology
Xiaoxuan Pan, Xi Cao, Weiting Wang, Ziyue Hua, Weizhou Cai, Xuegang Li, Haiyan Wang, Jiaqi Hu, Yipu Song, Dong-Ling Deng, Chang-Ling Zou, Re-Bing Wu, Luyan Sun
Summary: Quantum computer can boost machine learning through its inherent quantum parallelism. In the pursuit of quantum advantages for machine learning with noisy intermediate-scale quantum devices, an end-to-end learning model design approach was proposed, where the quantum ansatz is parameterized by directly manipulable control pulses without circuit design and compilation. Experimental realization of quantum end-to-end machine learning on a superconducting processor is reported. The trained model achieved 98% recognition accuracy for two handwritten digits (via two qubits) and 89% for four digits (via three qubits) in the MNIST database, demonstrating great potential for resolving complex real-world tasks when more qubits are available.
NPJ QUANTUM INFORMATION
(2023)
Article
Multidisciplinary Sciences
Xiaoxuan Pan, Zhide Lu, Weiting Wang, Ziyue Hua, Yifang Xu, Weikang Li, Weizhou Cai, Xuegang Li, Haiyan Wang, Yi-Pu Song, Chang-Ling Zou, Dong-Ling Deng, Luyan Sun
Summary: Deep learning and quantum computing have made significant progress in recent years. This work demonstrates the training of deep quantum neural networks using the backpropagation algorithm with a six-qubit programmable superconducting processor. The experimental results show the efficient training of three-layer and six-layer deep quantum neural networks for learning two-qubit and single-qubit quantum channels. This research provides valuable guidance for quantum machine learning applications with current and future quantum devices.
NATURE COMMUNICATIONS
(2023)
Article
Quantum Science & Technology
Ming Li, Yan-Lei Zhang, Xin-Biao Xu, Chun-Hua Dong, Guang-Can Guo, Chang-Ling Zou
Summary: This study explores the continuous-variable quantum entanglement of dissipative Kerr soliton combs in microresonators, uncovering two distinct features: entanglement of comb lines at the spectral edge and diminished entanglement at the center of the spectrum.
ADVANCED QUANTUM TECHNOLOGIES
(2023)
Article
Optics
Cong-Hua Yan, Ming Li, Xin-Biao Xu, Yan-Lei Zhang, Xin-Yue Ma, Chang-Ling Zou
Summary: Manipulating single photons coherently and achieving unidirectional propagation are important goals for integrated quantum information processing. In this study, an external scatterer is introduced to cancel the reflection of photons caused by nonideal chiral interactions in a photonic device. By controlling the interference between reflected photons, the reflection properties of single incident photons can be controlled, leading to unidirectional propagation even with nonideal photon-atom interactions.
Article
Physics, Applied
Mai Zhang, Xie-Hang Yu, Xin-Biao Xu, Guang-Can Guo, Chang-Ling Zou
Summary: By utilizing spatial-temporal modulation, single photon spectral manipulation and motion control of massive particles can be achieved, which is significant for photonics integrated chips and microscale particle manipulation.
PHYSICAL REVIEW APPLIED
(2023)
