Yong‐Chun Liu

State Key Laboratory of Low-Dimensional Quantum Physics

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Yun‐Feng Xiao

Peking University

Qihuang Gong

Peking University

Cuicui Lu

Beijing Institute of Technology

Bei‐Bei Li

Tobacco Research Institute

Li You

Tsinghua University

Yan Li

Beijing Institute of Petrochemical Technology

Yuanjiang Tang

Tsinghua University

Long‐Gang Huang

Tsinghua University

Xiaoyong Hu

Peking University

Xuanchen Zhang

Tsinghua University

Cooperative Institutions

Chinese Academy of Sciences

Tsinghua University

Peking University

Collaborative Innovation Center of Quantum Matter

University of Chinese Academy of Sciences

Beijing Academy of Quantum Information Sciences

Xi'an Jiaotong University

Beijing Institute of Technology

Shanxi University

State Key Laboratory of Low-Dimensional Quantum Physics

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Coupling of a single diamond nanocrystal to a whispering-gallery microcavity: Photon transport benefitting from Rayleigh scattering

Physical Review A (2011)

Yong‐Chun Liu Yun‐Feng Xiao Bei‐Bei Li Xuefeng Jiang Yan Li

We study the Rayleigh scattering induced by a diamond nanocrystal in a whispering-gallery-microcavity--waveguide coupling system and find that it plays a significant role in the photon transportation. On the one hand, this study provides insight into future solid-state cavity quantum electrodynamics aimed at understanding strong-coupling physics. On the other hand, benefitting from this Rayleigh scattering, effects such as dipole-induced transparency and strong photon antibunching can occur simultaneously. As a potential application, this system can function as a high-efficiency photon turnstile. In contrast to B. Dayan et al. [Science 319, 1062 (2008)], the photon turnstiles proposed here are almost immune to the nanocrystal's azimuthal position.

Optical microcavity

Whispering gallery

10.1103/physreva.84.011805

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Citations (51)

Anti- PT symmetry in dissipatively coupled optical systems

Physical review. A/Physical review, A (2017)

Fan Yang Yong‐Chun Liu Li You

We show that anti-$\mathcal{PT}$ symmetry can be realized in dissipatively coupled optical systems. Its emergence gives rise to spontaneous phase transitions for the guided and localized photonic eigenmodes in the waveguide and cavity systems studied, respectively. As a ubiquitous feature we demonstrate that constant refraction [analogous to unit refraction in [Nat. Phys. 12, 1139 (2016)]] occurs in the $\mathcal{PT}$-symmetric phase, which leads to several interesting properties for the photonic system, such as flat broadband light transport and dispersion-induced dissipation.

10.1103/physreva.96.053845

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Citations (156)

Tunable optical second-order sideband effects in a parity-time symmetric optomechanical system

arXiv (Cornell University) (2019)

Xing Xiao Qinghong Liao Nanrun Zhou Wenjie Nie Yong‐Chun Liu

We theoretically investigate the optical second-order sideband generation (OSSG) in an optical parity-time (PT) symmetric system, which consists of a passive cavity trapping the atomic ensemble and an active cavity. It is found that near the exceptional point (EP), the efficiency of the OSSG increases sharply not only for the blue probe-pump detuning resonant case but also for the red one. Using experimentally achievable parameters, we study the effect of the atomic ensemble on the efficiency of the OSSG. The numerical results show that the efficiency of the OSSG is 30% higher than that of the first-order sideband, which is realized easily by simultaneously modulating the atom-cavity coupling strength and detuning. Moreover, the efficiency of the OSSG can also be tuned effectively by the pump power, and the efficiency is robust when the pump power is strong enough. This study may have some guidance for modulating the nonlinear optical properties and controlling light propagation, which may stimulate further applications in optical communications.

Parity (physics)

10.48550/arxiv.1912.09105

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Subpicotesla Optomechanical Magnetometry

Physical Review Letters (2024)

An-Ning Xu Yifan Li Xiangliang Li Bei Liu Yong‐Chun Liu

High-sensitivity magnetometry has found important applications in fields ranging from basic science studies such as searching for dark matter and exotic particles to more practical tasks in geology, archaeology, navigation, and biomedicine. Currently, the performance of typical high-sensitivity magnetometers is limited by the required stringent operation environment, such as cryogenic conditions for superconducting quantum interference device magnetometers and near-zero-field environments for spin-exchange-relaxation-free atomic magnetometers. This Letter reports a high-sensitivity solid-state magnetometer based on a magnetostrictive gap-swing Fabry-Pérot cavity optomechanical system that is capable of benchmark performance at ambient environment conditions. Thanks to the strong resonance enhancement of the gap-swing mechanical mode, it achieves a sensitivity of 620 fT Hz^{-1/2} at room temperature and under the Earth's magnetic field, and is expected to approach the thermal-noise-limited sensitivity of 5.9 fT Hz^{-1/2} by controlling the optomechanical coupling. Our Letter opens the avenue toward the application of portable and low-maintenance high-sensitivity magnetometry in broad fields.

10.1103/physrevlett.133.153601

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Citations (1)

Controlled Synchronization by Limited Capacity Communication Channel

Indonesian Journal of Electrical Engineering and Computer Science (2014)

Ziqi Dong Yong‐Chun Liu Da Lin

The work focuses on synchronization of time-delay chaos systems under information constraints. A theoretical analysis for time-delayed system by limited communication channel is provided. By using the Lyapunov-Krasovskii approach, a synchronization condition is first obtained. Encoder of binary coding is designed by this condition, and synchronization error of this systems tends to zero. Finally, analytical conditions are used for synchronization of time-delay chaos systems under information constraints, and simulations verify the validity of obtained result.

10.11591/ijeecs.v12.i7.pp5362-5367

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Observer-based hybrid adaptive fuzzy neural tracking control for a class of unknown chaotic systems

Da Lin Yong‐Chun Liu

In this paper, an observer-based hybrid adaptive fuzzy neural controller (HAFNC) for a class of unknown chaotic systems is developed. The observer-based output feedback control law and a hybrid adaptive law to tune online the weighting factors of the adaptive fuzzy neural controller are derived. The total states of the chaotic system are not assumed to be available for measurement. The hybrid adaptive law utilizes two types of errors in the adaptive system, the tracking error and the modeling error. Based on strictly- positive-real (SPR) Lyapunov theory, the stability of the closed-loop system can be verified. To demonstrate the effectiveness of the proposed method, simulation results are illustrated in this paper.

Tracking error

Lyapunov stability

Observer (physics)

Adaptive system

10.1109/icsai.2012.6223525

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Polarization-dependent detection of cylinder nanoparticles with mode splitting in a high-Q whispering-gallery microresonator

Applied Physics Letters (2010)

Xu Yi Yun‐Feng Xiao Yan Li Yong‐Chun Liu Bei‐Bei Li

Using the single-scatterer-induced coupling mechanism of a pair of counterpropagating high-Q whispering-gallery modes (WGMs), we investigate the highly sensitive detection of single nonspherical nanoparticles. The nonspherical particle may produce distinct frequency splitting and additional damping for TE and TM WGMs. This polarization-dependent effect allows for studying the orientation of single biomolecule, molecule-molecule interaction on the microcavity surface, and possibly distinguishing different inner configurations of similar biomolecules.

Biomolecule

Nanophotonics

Whispering gallery

10.1063/1.3520138

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Citations (27)

Applied Research on the Orderly Charging of Large-scale Electric Vehicles in Residential Areas

2022 China International Conference on Electricity Distribution (CICED) (2021)

Hua Gao Yong‐Chun Liu

As a new type and large capacity load, electric vehicle will bring new challenges to the safety and economic operation of power system when it is connected to power grid in large quantities. According to the development trend of electric vehicle construction in residential area, this paper expounds the concept of orderly charging and demonstrates the necessity of its large-scale promotion. And from the point of view of suitable for rapid promotion and application, a scheme suitable for the orderly charging of large-scale electric vehicles in residential areas is put forward, and its architecture, business process, control strategy, reward and punishment mechanism are described in detail. The research results of this paper will provide useful reference for the future large-scale promotion of intelligent orderly charging in residential areas.

Promotion (chess)

10.1109/ciced50259.2021.9556658

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Citations (3)

Position-insensitive photon turnstiles in a diamond nanocrystal — microcavity system

Yong‐Chun Liu Qihuang Gong Bei‐Bei Li Xuefeng Jiang Yan Li

We study the Rayleigh scattering induced by a diamond nanocrystal in a whispering-gallery-microcavity–waveguide coupling system, and find that it plays a significant role in the photon transportation. On one hand, this study provides a new insight into future solid-state cavity quantum electrodynamics toward strong coupling physics. On the other hand, benefitting from this Rayleigh scattering, novel photon transportation such as dipole induced transparency and strong photon antibunching can occur simultaneously. As potential applications, this system can function as high-efficiency photon turnstiles. In contrast to [B. Dayan et al., Science 319, 1062 (2008)], the photon turnstiles proposed here are highly immune to nanocrystal's azimuthal position..

Position (finance)

10.1364/iqec.2011.i285

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Citations (0)

Macroscopic mechanical systems are entering the quantum world

National Science Review (2014)

Yong‐Chun Liu Yun‐Feng Xiao

10.1093/nsr/nwu050

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Citations (5)