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Evaluation and Suppression of Vibrational Noise for Cryogenic Surface Electrode Ion Traps

Chinese Physics Letters 2025年第3期42卷 52-62页

作者： Qingqing Qin Baoquan Ou Wei Wu Yi Xie Ting Chen Chunwang Wu Pingxing Chen Institute for Quantum Science and Technology College of ScienceNational University of Defense TechnologyChangsha 410073China Hunan Key Laboratory of Mechanism and Technology of Quantum Information Changsha 410073China Department of Physics College of ScienceNational University of Defense TechnologyChangsha 410073China

Cryogenic ion traps offer substantial advantages over their room-temperature counterparts,particularly in terms of stable ion confinement and ***,this technological advancement has introduced a significant challenge,namely the generation of additional vibrational *** noise is pronounced during the compression and expansion phases of the Gifford–McMahon cycle refrigerator and stems from the mechanical operation of the cold *** residual vibrational noise can modulate the Rabi oscillation frequency,thereby compromising the fidelity of the quantum logic *** this study,we quantitatively assess the impact of residual vibrational noise and introduce an innovative strategy for its *** strategy was designed to reduce superimposed potential fluctuations within a cryogenic surface electrode ion *** measured residual vibrational noise was used for real-time feedback *** the inverse determination of the compensating potential for a stable superimposed trapping potential is an inherently ill-posed problem considering known measurement noise *** applying quadratic programming,we numerically calculated the optimal time series for the compensation *** ensemble of these compensation voltages was applied in real time to the static compensation *** this method is in the theoretical stage,we believe that it can effectively suppress the translation induced by vibrational noise and foster the creation of a stable superimposed harmonic *** deployment of this technique is expected to substantially improve the accuracy of quantum operations,thereby fueling the evolution of quantum technologies.

关键词： vibrational thereby quantum

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Passive on-chip isolators based on the thin-film lithium niobate platform

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Chinese Physics B 2025年第3期34卷 408-413页

作者： Jiacheng Liu Gongyu Xia Qilin Hong Pingyu Zhu Kai-Kai Zhang keyu Xia Ping Xu Shiqiao Qin Zhihong Zhu College of Advanced Interdisciplinary Studies&Hunan Provincial Key Laboratory of Novel Nano Optoelectronic Information Materials and Devices National University of Defense TechnologyChangsha 410073China Institute for Quantum Information and State Key Laboratory of High-Performance Computing College of Computer Science and TechnologyNational University of Defense TechnologyChangsha 410073China College of Engineering and Applied Sciences National Laboratory of Solid State Microstructuresand Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210023China

Optical isolators,the photonic analogs of electronic diodes,are essential for ensuring the unidirectional flow of light in optical systems,thereby mitigating the destabilizing effects of back ***-film lithium niobate(TFLN),hailed as“the silicon of photonics,”has emerged as a pivotal material in the realm of chip-scale nonlinear optics,propelling the demand for compact optical *** report a breakthrough in the development of a fully passive,integrated optical isolator on the TFLN platform,leveraging the Kerr effect to achieve an impressive 10.3 dB of isolation with a minimal insertion loss of 1.87 *** theoretical simulations have demonstrated that our design,when applied to a microring resonator with a Q factor of 5×10^(6),can achieve 20 dB of isolation with an input power of merely 8 *** advancement underscores the immense potential of lithium niobate-based Kerr-effect isolators in propelling the integration and application of high-performance on-chip lasers,heralding a new era in integrated photonics.

关键词： thin-film lithium niobate Kerr effect optical isolator

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Time Evolution of Orbital Angular Momentum Modes for Deep-Routing Multiplexing Channels

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Engineering 2025年第2期45卷 97-104页

作者： Zebin Huang Peipei Wang Jiafu Chen Wenjie Xiong Huapeng Ye Xinxing Zhou Ze Dong Dianyuan Fan Shuqing Chen Institute of Microscale Optoelectronics Shenzhen UniversityShenzhen 518060China School of Physics and Electronic Information Huaibei Normal UniversityHuaibei 235000China Guangdong Provincial Key Laboratory of Optical Information Materials and Technology&Institute of Electronic Paper Displays South China Academy of Advanced OptoelectronicsSouth China Normal UniversityGuangzhou 510006China Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of the Ministry of Education Synergetic Innovation Center for Quantum Effects and ApplicationsSchool of Physics and ElectronicsHunan Normal UniversityChangsha 410081China School of Information and Electronics Beijing Institute of TechnologyBeijing 100081China

Optical orbital angular momentum(OAM)mode multiplexing has emerged as a promising technique for boosting communication ***,most existing studies have concentrated on channel(de)-multiplexing,overlooking the critical aspect of channel *** challenge involves the reallocation of multiplexed OAM modes across both spatial and temporal domains—a vital step for developing versatile communication *** address this gap,we introduce a novel approach based on the time evolution of OAM modes,utilizing the orthogonal conversion and diffractive modulation capabilities of unitary *** approach facilitates high-dimensional orthogonal transformations of OAM mode vectors,altering both the propagation direction and the spatial *** Fresnel diffraction matrices as unitary operators,it manipulates the spatial locations of light beams during transmission,breaking the propagation invariance and enabling temporal *** a demonstration,we have experimentally implemented the deep routing of four OAM modes within two distinct time *** an average diffraction efficiency above 78.31%,we have successfully deep-routed 4.69 Tbit-s^(-1)quadrature phase-shift keying(QPSK)signals carried by four multiplexed OAM channels,with a bit error rate below 10^(-6).These results underscore the efficacy of our routing strategy and its promising prospects for practical applications.

关键词： Orbital angular momentum Time evolution modulation Deep-routing technology Unitary transformation Mode-division communication networks

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Precise quantum control of molecular rotation toward a desired orientation

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Physical Review Research 2025年第1期7卷 L012049-L012049页

作者： Qian-Qian Hong Daoyi Dong Niels E. Henriksen Franco Nori Jun He Chuan-Cun Shu Hunan Key Laboratory of Nanophotonics and Devices Hunan Key Laboratory of Super-Microstructure and Ultrafast Process School of Physics Central South University Changsha 410083 China Australian Artificial Intelligence Institute Faculty of Engineering and Information Technology University of Technology Sydney NSW 2007 Australia Department of Chemistry Technical University of Denmark Building 207 DK-2800 Kongens Lyngby Denmark Quantum Computing Center and Theoretical Quantum Physics Laboratory RIKEN Saitama 351-0198 Japan Physics Department University of Michigan Ann Arbor Michigan 48109 USA

The lack of a direct map between control fields and desired control objectives poses a significant challenge in applying quantum control theory to quantum technologies. Here, we propose an analytical framework to precisely control a limited set of quantum states and construct desired coherent superpositions using a well-designed laser pulse sequence with optimal amplitudes, phases, and delays. This theoretical framework that corresponds to a multilevel pulse-area theorem establishes a straightforward mapping between the control parameters of the pulse sequence and the amplitudes and phases of rotational states within a specific subspace. As an example, we utilize this approach to generate 15 distinct and desired rotational superpositions of ultracold polar molecules, leading to 15 desired field-free molecular orientations. By optimizing the superposition of the lowest 16 rotational states, we demonstrate that this approach can achieve a maximum orientation value of |〈cosθ〉|max above 0.99, which is very close to the global optimal value of 1 that could be achieved in an infinite-dimensional state space. This work marks a significant advancement in achieving precise control over multilevel subsystems within molecules. It holds potential applications in molecular alignment and orientation, as well as in various interdisciplinary fields related to the precise quantum control of ultracold polar molecules, opening up considerable opportunities in molecular-based quantum techniques.

关键词： Molecular orientation

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Observation of quantum temporal correlations well beyond Lüders bound

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Physical Review Research 2025年第1期7卷 013058-013058页

作者： Chun-Wang Wu Man-Chao Zhang Yan-Li Zhou Ting Chen Ran Huang Yi Xie Wen-bo Su Bao-Quan Ou Wei Wu Institute for Quantum Science and Technology College of Science NUDT Changsha 410073 Hunan China Hunan Key Laboratory of Quantum Information Mechanism and Technology NUDT Changsha 410073 Hunan China Quantum Computing Center and Cluster for Pioneering Research RIKEN Wako-shi Saitama 351-0198 Japan Hefei National Laboratory Hefei 230088 Anhui China

The ability of achieving strong quantum spatial correlations has helped the emergence of quantum information science. In contrast, how to achieve strong quantum temporal correlations (QTCs) has remained as a long-standing challenge, thus hindering their applications in time-domain quantum control. Here we experimentally demonstrate that by using a parity-time (PT)–symmetric single ion, the conventional QTC limit known as the Lüders bound can be well surpassed within a standard measurement scenario, approaching the predicted maximum QTC value. Our work, as a step toward quantum engineering of PT devices in the time domain, can stimulate more efforts on operating various quantum devices with the aid of strong QTC resources.

关键词： quantum optics

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Anisotropic optical path model for characterizing statistics of scattered field

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Optics Express 2025年第10期33卷 21306-21317页

作者： Bao, Ke Li, Yuegang Nie, Zhenwu Sun, Shuai Liu, Weitao Institute for Quantum Science and Technology College of Science National University of Defense Technology Changsha 410073 China Interdisciplinary Center for Quantum Information National University of Defense Technology Changsha 410073 China Hunan Key Laboratory of Mechanism and Technology of Quantum Information Changsha 410073 China State Key Laboratory of Photonics and Communications Institute for Quantum Sensing and Information Processing Shanghai Jiao Tong University Shanghai 200240 China Hunan Research Center of the Basic Discipline for Physical States National University of Defense Technology Changsha 410073 China

A model that captures the statistical properties of the scattered light field can offer a physical explanation and computational support for designing and evaluating imaging schemes. Here, we propose an Anisotropic Optical Path (AOP) model that incorporates statistics of different optical paths affected by scattering, with photons involved in different processes. The model enables simulation of a limited field of view (FOV) constrained by the memory effect. It also reflects spectral differences under broadband illumination, thereby enhancing its applicability for light field simulation in higher degrees of freedom. Due to the decorrelation trend of speckle patterns at different wavelengths, the model verifies the feasibility of using scattering media as spectral filters. © 2025 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.

关键词： Light transmission Optical imaging Optical systems Phase plates Scattering media Speckle patterns

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Deterministic generation of non-classical mechanical states in cavity optomechanics via reinforcement learning

arXiv

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arXiv 2025年

作者： Liu, Yu-Hong Tan, Qing-Shou Kuang, Le-Man Liao, Jie-Qiao Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education Key Laboratory for Matter Microstructure and Function of Hunan Province Department of Physics Synergetic Innovation Center for Quantum Effects and Applications Hunan Normal University Changsha410081 China Key Laboratory of Hunan Province on Information Photonics and Freespace Optical Communication College of Physics and Electronics Hunan Institute of Science and Technology Yueyang414000 China Institute of Interdisciplinary Studies Hunan Normal University Changsha410081 China

Non-classical mechanical states, as vital quantum resources for exploring macroscopic quantum behavior, have wide applications in the study of the fundamental quantum mechanics and modern quantum technology. In this work, we propose a scheme for deterministically generating non-classical mechanical states in cavity optomechanical systems. By working in the eigen-representation of the nonlinear optomechanical systems, we identify the carrier-wave resonance conditions and seek for the optimal driving pulses for state preparations. Concretely, we employ the reinforcement learning method to optimize the pulsed driving fields, effectively suppressing the undesired transitions induced by both the pulsed driving fields and dissipations. This approach enables the high-fidelity preparation of phononic Fock states and superposed Fock states in the single-resonator optomechanical systems, as well as two-mode entangled states in the two-resonator optomechanical systems. The statistical properties of the generated states are also examined. Our results open a way for quantum state engineering in quantum optics and quantum information science via reinforcement learning. Copyright © 2025, The Authors. All rights reserved.

关键词： quantum optics

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Molecular optomechanically induced transparency

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Physical Review A 2025年第4期111卷 043507-043507页

作者： Bin Yin Jie Wang Mei-Yu Peng Qian Zhang Deng Wang Tian-Xiang Lu Ke Wei Hui Jing Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education Department of Physics and Synergetic Innovation Center for Quantum Effects and Applications Hunan Normal University Changsha 410081 China College of Physics and Electronic Information Gannan Normal University Ganzhou 341000 Jiangxi China Zhejiang Key Laboratory of Micro-Nano Quantum Chips and Quantum Control School of Physics Zhejiang University Hangzhou 310027 China Institute for Quantum Science and Technology College of Science National University of Defense Technology Changsha 410073 China

Molecular cavity optomechanics (COM), characterized by remarkably efficient optomechanical coupling enabled by a highly localized light field and ultrasmall effective mode volume, holds significant promise for advancing applications in quantum science and technology. Here, we study optomechanically induced transparency and the associated group delay in a hybrid molecular COM system. We find that even with an extremely low optical quality factor an obvious transparency window can appear, which is otherwise unattainable in a conventional COM system. Furthermore, by varying the ports of the probe light, the optomechanically induced transparency or absorption can be achieved, along with corresponding slowing or advancing of optical signals. These results indicate that our scheme provides an alternative method for adjusting the storage and retrieval of optical signals in such a molecular COM device.

关键词： Group delay

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Reinforcement learning assisted non-reciprocal optomechanical gyroscope

arXiv

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arXiv 2025年

作者： Tan, Qing-Shou Jiao, Ya-Feng Zuo, Yunlan Xu, Lan Liao, Jie-Qiao Kuang, Le-Man Key Laboratory of Hunan Province on Information Photonics and Freespace Optical Communication College of Physics and Electronics Hunan Institute of Science and Technology Yueyang414000 China School of Electronics and Information Zhengzhou University of Light Industry Zhengzhou450001 China Academy for Quantum Science and Technology Zhengzhou University of Light Industry Zhengzhou450002 China School of Physics and Chemistry Hunan First Normal University Changsha410205 China Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education Department of Physics Synergetic Innovation Center for Quantum Effects and Applications Hunan Normal University Changsha410081 China

We propose a novel optomechanical gyroscope architecture based on a spinning cavity optomechanical resonator (COM) evanescently coupled to a tapered optical fiber without relying on costly quantum light sources. Our study reveals a striking dependence of the gyroscope’s sensitivity on the propagation direction of the driving optical field, manifesting robust quantum non-reciprocal behavior. This non-reciprocity significantly enhances the precision of angular velocity estimation, offering a unique advantage over conventional gyroscopic systems. Furthermore, we demonstrate that the operational range of this non-reciprocal gyroscope is fundamentally governed by the frequency of the pumping optical field, enabling localized sensitivity to angular velocity. Leveraging the adaptive capabilities of reinforcement learning (RL), we optimize the gyroscope’s sensitivity within a targeted angular velocity range, achieving unprecedented levels of precision. These results highlight the transformative potential of RL in advancing high-resolution, miniaturized optomechanical gyroscopes, opening new avenues for next-generation inertial sensing technologies. © 2025, CC BY.

关键词： Gyroscopes

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Probing spatial effects on quantum reservoir sensing in quasi-one-dimensional Bose-Einstein condensates

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Physical Review Research 2025年第2期7卷 023100-023100页

作者： Lan Xu Ya Yang Yunlan Zuo Abdelâali Boudjemâa Qing-Shou Tan School of Physics and Chemistry Hunan First Normal University Changsha 410205 China Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of the Ministry of Education Hunan Normal University Changsha 410081 China Department of Physics Faculty of Exact Sciences and Informatics and Laboratory of Mechanics and Energy Hassiba Benbouali University of Chlef P.O. Box 78 02000 Chlef Algeria Key Laboratory of Hunan Province on Information Photonics and Freespace Optical Communication College of Physics and Electronics Hunan Institute of Science and Technology Yueyang 414000 China

We explore the impact of spatial separation between two sensor qubits on quantum sensing performance within a quasi-one-dimensional Bose-Einstein condensate reservoir. By analyzing the quantum Fisher information and quantum signal-to-noise ratio for sensor qubits initialized in both entangled and product states, we reveal distinct behaviors in estimating key reservoir parameters, including spectral density coupling strength and temperature. For coupling strength estimation, smaller spatial distances between the sensor qubits enhance sensing precision. In contrast, for temperature sensing, the spatial separation emerges as a valuable resource, enabling significant improvements in estimation accuracy. Additionally, we discover that product states may outperform entangled states for parameter estimation in quantum reservoir sensing. These findings provide insights into leveraging spatial configurations and state initialization for optimizing quantum sensing protocols in quantum reservoirs.

关键词： quantum entanglement

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