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Squeezed Vibrational States in a Quantized Trap

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Chinese Physics Letters 1995年第4期12卷 203-206页

作者： zeng heping LIN Fucheng Shanghai Institute of Optics and Fine Mechanics Academia SinicaShanghai 201800

The quantized center of mass(c.m.)motion of a single two-level atom or ion confined in a one-dimensional harmonic potential and interacting with a single-mode classical traveling laser field,is *** show that both quadrature and amplitude squared squeezed vibrational states can be generated in this simple trap model when *** is initially in a certain coherent trap state.

关键词： initially traveling coherent

Nonclassical Bose-Einstein Condensate

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Chinese Physics Letters 1995年第10期12卷 593-596页

作者： zeng heping LIN Fucheng Shanghai Institute of Optics and Fine Mechanics Academia SinicaShanghai 201800

A scheme for the generation of a nonclassical Bose-Einstein condensate is proposed in a J_(g)=1→J_(e)=0 system where ultracold atoms are populated in one ground-state sublevel|g_〉and form a Bose-Einstein *** coupling the condensate to copropagating classical(σ^(-))and quantum(σ^(+))non-resonant travelling-wave laser fields,effective two-photon excitations between two ground-state sublevels|g_〉and|g+〉create a new condensate in|g+〉.For an appropriate selection of the interaction time and atom-field coupling strengths,the quantum features of the quantized laser field,which may be prepared in a certain nonclassical state,can be exchanged with those of the quantum density field of the generated condensate.

关键词： Einstein quantum coupling

Nonclassical Features Interchange Between the Cavity Field and Quantized Trap

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Chinese Physics Letters 1995年第3期12卷 156-159页

作者： zeng heping LIN Fucheng Shanghai Institute of Optics and Fine Mechanics Academia SinicaShanghai 201800

A novel recipe is proposed to generate nonclassical vibrational states of the center-of mass motions of ions in a quantized trap,based on the quantum conversion between the quantum cavity fields and the quantized *** is shown that,when an ion trap system interacts with the eigen mode of a single-mode Fabry-Pérot cavity where the trap was set in,and a particularly selected external laser pulse through Raman transitions,the interchange of the quantum features between the quantum light states and the quantized trap states *** kind of quantum conversion can be used to prepare some nonclassical trap states in an ion trap as well as to measure the properties of initial nonclassical vibrational states.

关键词： states. quantum vibrational

Mid-infrared single-photon 3D imaging

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Light(Science & Applications) 2023年第7期12卷 1327-1336页

作者： Jianan Fang Kun Huang E Wu Ming Yan heping zeng State Key Laboratory of Precision Spectroscopy East China Normal UniversityShanghaiChina Chongqing Key Laboratory of Precision Optics Chongqing Institute of East China Normal UniversityChongqingChina Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuanShanxiChina Chongqing Institute for Brain and Intelligence Guangyang Bay LaboratoryChongqingChina Shanghai Research Center for Quantum Sciences ShanghaiChina Jinan Institute of Quantum Technology JinanShandongChina

Active mid-infrared(MIR)imagers capable of retrieving three-dimensional(3D)structure and reflectivity information are highly attractive in a wide range of biomedical and industrial ***,infrared 3D imaging at lowlight levels is still challenging due to the deficiency of sensitive and fast MiR *** we propose and implement a MiR time-of-flight imaging system that operates at single-photon sensitivity and femtosecond timing ***,back-scattered infrared photons from a scene are optically gated by delay-controlled ultrashort pump pulses through nonlinear frequency *** upconverted images with time stamps are then recorded by a silicon camera to facilitate the 3D reconstruction with high lateral and depth ***,an effective numerical denoiser based on spatiotemporal correlation allows us to reveal the object profle and reflectivity under photon-starving conditions with a detected flux below 0.05 photons/pixel/*** presented MIR 3D imager features high detection sensitivity,precise timing resolution,and wide-field operation,which may open new possibilities in life and material sciences.

关键词： reflectivity attractive precise

Low-noise InGaAs/InP single-photon detector with widely tunable repetition rates

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Photonics Research 2019年第3期7卷 I0001-I0006页

作者： YAN LIANG QILAI FEI ZHIHE LIU KUN HUANG heping zeng Shanghai Key Laboratory of Modern Optical Systems Engineering Research Center of Optical Instruments and Systems Ministry of EducationSchool of Optical-Electrical and Computer Engineering University of Shanghai for Science and Technology State Key Laboratory of Precision Spectroscopy East China Normal University

InGaAs/InP avalanche photodiodes typically work in the gated Geiger mode to achieve near-infrared singlephoton detection. By using ultrashort gates and combining with the robust spike-canceling technique that consists of the capacitance-balancing and low-pass filtering technique, we demonstrate an InGaAs/InP single-photon detector(SPD) with widely tunable repetition rates in this paper. The operation frequency could be tuned conveniently from 100 MHz to 1.25 GHz with the SPD's performance measured to maintain good performance, making it quite suitable for quantum key distribution, laser ranging, and optical time domain reflectometry. Furthermore,the SPD exhibited extremely low-noise characteristics. The detection efficiency of this SPD could reach 20% with the dark count rate of 2.5 × 10^(-6)∕gate and after-pulse probability of 4.1% at 1 GHz.

关键词： InGaAs/InP single-photon detector achieve near-infrared singlephoton detection robust spike-canceling technique

Quantum key distribution in 50-km optic fibers

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Science China(Physics,Mechanics & Astronomy) 2004年第2期47卷 182-188页

作者： ZHOU Chunyuan WU Guang CHEN Xiuliang LI Hexiang zeng heping Key Laboratory of Optical and Magnetic Resonance Spectroscopy and Department of Physics East China Normal University Shanghai 200062 China Key Laboratory of Optical and Magnetic Resonance Spectroscopy and Department of Physics East China Normal University Shanghai 200062 China Key Laboratory of Optical and Magnetic Resonance Spectroscopy and Department of Physics East China Normal University Shanghai 200062 China Key Laboratory of Optical and Magnetic Resonance Spectroscopy and Department of Physics East China Normal University Shanghai 200062 China Key Laboratory of Optical and Magnetic Resonance Spectroscopy and Department of Physics East China Normal University Shanghai 200062 China

In this paper, we report our recent experiment of long-distance fiber-optic plug and play quantum cryptography system wherein a Faraday-Mirror was used to compensate for the polarization mode dispersion and phase drifts. The pulse-biased coincident gate single-photon detection technique was used to effectively reduce the noises from the detrimental Rayleigh backscattering. We have achieved a quantum key distribution system with the working distance of 50 km, which was tested to be stable in more than 6 hours continuous work. And we also demonstrated the practical quantum communication in a local area network using the TCP protocol.

关键词： quantum cryptography, single-photon interference, polarization mode dispersion, phase- modula.

Morphology-controlled Electrodeposition of Copper Nanospheres onto FTO for Enhanced Photocatalytic Hydrogen Production

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Chinese Journal of Chemistry 2018年第1期36卷 31-36页

作者： Jieyun He Heshan Feng Ting Wang Tingting Wang heping zeng Key Laboratory of Functional Molecular Engineering of Guangdong Province School of Chemistry and Chemical Engineering South China University of Technology Guangzhou Guangdong 510641 China

Using CuSO4 as the copper source, nanostructured copper with four different morphologies was obtained by electrodeposition method on FTO substrates. The as-synthesized Cu/FTO samples were characterized by X-ray diffraction （XRD）, diffuse reflectance spectroscopy （DRS）, Raman, X-ray photoelectron spectroscopy （XPS）, scanning electron microscopy （SEM）, energy-dispersive X-ray spectroscopy （EDS）, and transmission electron micros- copy （TEM）. The effects of electrodeposition potential and electrodeposition time on the Cu/FTO samples and the photocatalytic performance were investigated systematically. The results showed that the Cu/FTO samples were well-crystallized and the morphologies could be changed from nanoslices to nanodendrites structure with the negative shift of the depositing potential. The electrodeposition potential and time have a significant effect on the amount of Hz evolution. The obtained Cu nanospheres which were prepared at the potential of-0.65 V for 600 s showed the best photocatalytic behavior. The mechanisms for the photocatalytic activities were also discussed.

关键词： nano-structured Cu surface plasmon resonance hydrogen production

Single whispering-gallery mode lasing in polymer bottle microresonators via spatial pump engineering

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Light(Science & Applications) 2017年第1期6卷 490-496页

作者： Fuxing Gu Fuming Xie Xing Lin Shuangyi Linghu Wei Fang heping zeng Limin Tong Songlin Zhuang Shanghai Key Laboratory of Modern Optical Systems Engineering Research Center of Optical Instrument and System(Ministry of Education)University of Shanghai for Science and TechnologyShanghai 200093China State Key Laboratory of Modern Optical Instrumentation College of Optical Science and EngineeringZhejiang UniversityHangzhou 310027China State Key Laboratory of Precision Spectroscopy East China Normal UniversityShanghai 200062China

Single-mode lasing in whispering-gallery mode(WGM)microresonators is challenging to *** bottle microresonators,the highly non-degenerated WGMs are spatially well-separated along the long-axis direction and provide mode-selection *** this work,by engineering the pump intensity to modify the spatial gain profiles of bottle microresonators,we demonstrate a simple and general approach to realizing single-mode WGM lasing in polymer bottle *** pump intensity is engineered into an interference distribution on the bottle microresonator *** tuning the spacing between axial positions of the interference pump patterns,the mode intensity profiles of single-bottle WGMs can be spatially overlapped with the interference stripes,intrinsically enabling single-mode lasing and *** advantages of the system,including high sidemode suppression factors 420 dB,large spectral tunability 48 nm,low-lasing threshold and reversible control,are *** demonstrated approach may have a variety of promising applications,ranging from tunable single-mode lasing and sensing to nonlinear optics.

关键词： bottle microresonators polymer single-mode lasing spatial pump engineering whispering-gallery modes

Widely tunable mid-infrared fiber-feedback optical parametric oscillator

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Photonics Research 2024年第10期12卷 2123-2129页

作者： TINGTING YU JIANAN FANG KUN HUANG heping zeng State Key Laboratory of Precision Spectroscopy East China Normal UniversityShanghai 200062China Chongqing Key Laboratory of Precision Optics Chongqing Institute of East China Normal UniversityChongqing 401121China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China Chongqing Institute for Brain and Intelligence Guangyang Bay LaboratoryChongqing 400064China Shanghai Research Center for Quantum Sciences Shanghai 201315China

Synchronously pumped optical parametric oscillators(OPOs)provide uniquely versatile platforms to generate ultrafast mid-infrared pulses within a spectral range beyond the access of conventional mode-locked ***,conventional OPO sources based on bulk crystals have been plagued by complex optical alignment and large physical ***,we devise and implement two OPO variants based on a polarizationmaintaining fiber-feedback cavity,which allow to robustly deliver sub-picosecond MIR pulses without the need of active *** first one integrates an erbium-doped fiber into the OPO cavity as the additional gain medium,which significantly reduces the pump threshold and allows stable optical pulse formation within a spectral range of 1553–1586 *** second one adopts a chirped poling nonlinear crystal in a passive-fiber cavity to further extend the operation spectral coverage,which facilitates broad tuning ranges of 1350–1768 nm and 2450–4450 nm for the signal and idler bands,***,the presented mid-infrared OPO source is featured with high compactness,robust operation,and wide tunability,which would be attractive for subsequent applications such as infrared photonics,biomedical examination,and molecular spectroscopy.

关键词： fiber tunable polarization