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Characterization of laser cooling in microgravity via long-term operations in TianGong-2 space lab

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National Science Review 2023年第4期10卷 69-75页

作者： De-Sheng Lü Wei Ren Yuan Sun Tang Li Qiu-Zhi Qu Bin Wang Lin Li Jian-Bo Zhao Xin Zhao Jing-Wei Ji Mei-Feng Ye Jing-Feng Xiang Wei-Biao Chen Yu-Zhu Wang Liang Liu CAS Key Laboratory of Quantum optics and Center of Cold Atom Physics Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Aerospace Laser Engineering Department Shanghai Institute of Optics and Fine MechanicsChinese Academy of Sciences

The invention of laser cooling has fundamentally influenced the research frontier of atomic physics and quantum physics, and recently an intense focus has been on the studies of cold atom physics in microgravity environments. Herein, we report the results of our laser cooling experiment in Tian Gong-2 space lab, which operated for 34 consecutive months in orbit. Over such an extended operation time, the quality of laser cooling did not experience any significant decline, while the properties of laser cooling in orbital microgravity were systematically studied. In particular, we demonstrate magneto-optical trapping and polarization-gradient cooling in orbit and carefully examine their performances. A comparison of the in-orbit and on-ground results indicates that a higher cooling efficiency exists in microgravity, including a smaller loss rate during the trapping and cooling process and lower ultimate temperature of laser-cooled atoms. Our progress has laid the technical foundations for future applications of cold atoms in space missions with operation times of the order of years.

关键词： laser cooling polarization-gradient cooling orbital microgravity space lab

Local measurement of terahertz field-induced second harmonic generation in plasma filaments

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Frontiers of Optoelectronics 2023年第4期16卷 135-178页

作者： Kareem J.Garriga Francis Xi‑Cheng Zhang The Institute of Optics University of RochesterRochesterNY 14627USA

The concept of Terahertz Field-Induced Second Harmonic(TFISH)Generation is revisited to introduce a single-shot detection scheme based on third order nonlinearities.Focused specifcally on the further development of THz plasma-based sources,we begin our research by reimagining the TFISH system to serve as a direct plasma diagnostic.In this work,an optical probe beam is used to mix directly with the strong ponderomotive current associated with laser-induced ionization.A four-wave mixing(FWM)process then generates a strong second-harmonic optical wave because of the mixing of the probe beam with the nonlinear current components oscillating at THz frequencies.The observed conversion efciency is high enough that for the frst time,the TFISH signal appears visible to the human eye.We perform spectral,spatial,and temporal analysis on the detected second-harmonic frequency and show its direct relationship to the nonlinear current.Further,a method to detect incoherent and coherent THz inside plasma flaments is devised using spatio-temporal couplings.The single-shot detection confgurations are theoretically described using a combination of expanded FWM models with Kostenbauder and Gaussian Q-matrices.We show that the retrieved temporal traces for THz radiation from single-and twocolor laser-induced air-plasma sources match theoretical descriptions very well.High temporal resolution is shown with a detection bandwidth limited only by the spatial extent of the probe laser beam.Large detection bandwidth and temporal characterization is shown for THz radiation confned to under-dense plasma flaments induced by<100 fs lasers below the relativistic intensity limit.

关键词： Terahertz detection-Plasma characterization-Spectral characterization Single-shot detection

The role of surface charges in the blinking mechanisms and quantum-confined Stark effect of single colloidal quantum dots

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Nano Research 2022年第8期15卷 7655-7661页

作者： Jialu Li Dengfeng Wang Guofeng Zhang Changgang Yang Wenli Guo Xue Han Xiuqing Bai Ruiyun Chen Chengbing Qin Jianyong Hu Liantuan Xiao Suotang Jia State Key Laboratory of Quantum optics and Quantum optics Devices Institute of Laser SpectroscopyCollaborative Innovation Center of Extreme OpticsShanxi UniversityTaiyuan 030006China

The two frequently observed phenomena,photoluminescence(PL)blinking and quantum-confined Stark effect(QCSE)-induced spectral diffusion,are not conducive to the applications of colloidal quantum dots(QDs).It remains elusive how these two phenomena are linked to each other.Unraveling the potential link between blinking and QCSE could facilitate the adoption of appropriate strategies that can simultaneously suppress both PL blinking and spectral diffusion.In this work,we investigated the blinking mechanism and QCSE of single CdSe/CdS/ZnS QDs in the presence of positive and negative surface charges using single-dot PL spectroscopy.We found that the negative surface charges can simultaneously suppress PL blinking and spectral diffusion of single QDs.On the other hand,the positive surface charges could change the blinking mechanisms of QDs from Auger-blinking to band-edge carrier(BC)-blinking.Two types of QCSE were observed,and a significant QCSE-induced spectral broadening of 5.25 nm was measured,which could be attributed to the hopping of surface charges between different surface-trap sites.Based on these findings,several theoretical models are proposed to explain various phenomena observed.

关键词： single quantum dots blinking mechanisms quantum-confined Stark effect surface charges surface traps

Hybrid quantum key distribution network

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Science China(Information Sciences) 2022年第10期65卷 24-30页

作者： Siyu REN Yu WANG Xiaolong SU State Key Laboratory of Quantum optics and Quantum optics Devices Institute of Opto-Electronics Collaborative Innovation Center of Extreme optics Shanxi University State Key Laboratory of Cryptology

Quantum key distribution(QKD) is now moving toward a scalable and secure QKD network,which establishes secret keys among network users. The continuous-variable(CV) and discrete-variable(DV)QKD systems are currently being developed in parallel and are all used in QKD networks. We propose here a hybrid QKD network, in which the CV QKD system is used to build metropolitan QKD networks, and the DV QKD system is used to connect metropolitan QKD networks. The hybrid QKD network takes advantage of high secret key rates for CV QKD systems and long distance for DV QKD systems. We also present a feasible hybrid measurement-device-independent(MDI) QKD network, which combines both CV and DV MDI QKD systems. The presented hybrid QKD networks meet the low cost and compact requirement of a realistic QKD network and provide a feasible solution for future real QKD networks by combining the advantages of both CV and DV QKD systems.

关键词： quantum network quantum key distribution hybrid quantum information continuous variable discrete variable

Single-photon source with sub-MHz linewidth for cesium-based quantum information processing

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Frontiers of physics 2023年第6期18卷 275-281页

作者： Hai He Peng-Fei Yang Peng-Fei Zhang Gang Li Tian-Cai Zhang State Key Laboratory of Quantum optics and Quantum optics Devices Collaborative Innovation Center of Extreme OpticsInstitute of Opto-ElectronicsShanxi UniversityTaiyuan 030006China

A single-photon source with narrow bandwidth,high purity,and large brightness can efficiently interact with material qubits strongly coupled to an optical microcavity for quantum information processing.Here,we experimentally demonstrate a degenerate doubly resonant single-photon source at 852 nm by the cavity-enhanced spontaneous parametric downconversion process with a 100%duty cycle of generation.The single photon source possesses both high purity with a second-order correlation g^((2))_(h)(0)=0.021 and narrow linewidth with△_(V_(sp))=(800±13)kHz.The single-photon s Single-photon source with sub-MHz linewidth for cesium-based quantum information processingource is compatible with the cesium atom D2 line and can be used for cesium-based quantum information processing Single-photon source with sub-MHz linewidth for cesium-based quantum information processing0.021.

关键词： single-photon source sub-MHz linewidth few longitudinal modes quantum information processing

Light People:Professor Laura Na Liu

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Light(Science & Applications) 2024年第2期13卷 184-189页

作者： Hui Wang Cun Yu Changchun Institute of Optics Fine Mechanics and PhysicsChinese Academy of Sciences130033ChangchunChina

Editorial The DNA nanotechnology outlines a new chapter in biological sciences,opening a new era of scientific and technological advancements.A pioneer of DNA nanotechnology,Professor Liu from the University of Stuttgart in Germany,our latest Light People,has been working at the interface,where nanophotonics meets biology and chemistry.On the path of scientific explorations.

关键词： chemistry. advancement pioneer

Optimal preparation of Bose and Fermi atomic gas mixtures of ^(87)Rb and ^(40)K in a crossed optical dipole trap

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Chinese Physics B 2024年第6期33卷 356-361页

作者：丁培波单标赵宇航杨雅婧陈良超孟增明王鹏军黄良辉 State Key Laboratory of Quantum optics and Quantum optics Devices Institute of Opto-electronicsCollaborative Innovation Center of Extreme OpticsShanxi UniversityTaiyuan 030006China Hefei National Laboratory Hefei 230000China

We report on the optimal production of the Bose and Fermi mixtures with ^(87) Rb and ^(40)K in a crossed optical dipole trap(ODT).We measure the atomic number and lifetime of the mixtures in combination of the spin state |F=9/2,m_F=9/2) of^(40)K and |1,1>of ^(87) Rb in the ODT,which is larger and longer compared with the combination of the spin state 19/2,9/2) of^(40)K and 12,2) of ^(87)Rb in the ODT.We observe the atomic numbers of ^(87)Rb and ^(40)K shown in each stage of the sympathetic cooling process while gradually reducing the depth of the optical trap.By optimizing the relative loading time of atomic mixtures in the MOT,we obtain the large atomic number of ^(40)K(~6 ×10^(6)) or the mixtures of atoms with an equal number(~1.6 × 10^(6)) at the end of evaporative cooling in the ODT.We experimentally investigate the evaporative cooling in an enlarged volume of the ODT via adding a third laser beam to the crossed ODT and found that more atoms(8 × 10^(6)) and higher degeneracy(T/T_(F)=0.25) of Fermi gases are obtained.The ultracold atomic gas mixtures pave the way to explore phenomena such as few-body collisions and the Bose-Fermi Hubbard model,as well as for creating ground-state molecules of ^(87)Rb^(40)K.

关键词： optical dipole trap Bose and Fermi gas mixtures atomic lifetime

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Efficient production of ultracold polar molecules^(23)Na^(40)K in their absolute ground state via intermediate state of the coupled complex B^(1)Π|ν=4〉^(c)^(3)Σ^(+)|ν=25〉

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中国科学:物理学、力学、天文学英文版 2023年第9期66卷 42-49页

作者： Zi-Liang Li Zheng-Yu Gu Peng-Jun Wang Jing Zhang State Key Laboratory of Quantum optics and Quantum optics Devices Institute of Opto-electronicsShanxi UniversityTaiyuan 030006China Collaborative Innovation Center of Extreme optics Shanxi UniversityTaiyuan 030006China

We report on the efficient creation of a sample of 2.2×10^(4)fermionic polar molecules^(23)Na^(40)K in their rovibrational ground state X^(1)∑^(+)|v=0,J=0>at 247 nK via an intermediate state of the spin-orbit coupled complex B^(1)Π|v=4〉~C^(3)∑^(+)|v=25〉.Compared with the intermediate state of the coupled complex B^(1)Π|v=12〉^(c)^(3)∑^(+)|v=35〉,this intermediate state has the larger Franck-Condon factors for up-and down-leg coupling of stimulated Raman adiabatic passage(STIRAP).We demonstrate this two-photon pathway to the^(23)Na^(40)K ground state molecules and find that the one-way STIRAP transfer efficiency reaches75%.The molecules^(23)Na^(40)K in their rovibrational ground state are an ideal candidate for the quantum simulation and quantum information of ultracold molecules with long-range interaction.

关键词： ultracold atoms ultracold molecule STIRAP

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Wireless laser power transmission system for dynamic target based on rotation of single component

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激光与光电子学进展 2022年

作者： Shuaiyu Zhang Guohang Hu Lin Wang Yongjiang Liu Ling Wei Yifan Zheng Yuchuan Shao Shanghai University Institute of Optics and Electronics Chinese Academy of Sciences Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences

We design a novel wireless laser power transmission(WLPT) system in which the process of wireless power transmission to a dynamic target was completed based on the rotation of just one component. The design of this system not only reduces the load-bearing of the gimbal but also avoids the degradation of beam quality caused by lens vibration when tracking dynamic targets. As a result, this WLPT system has been verified by tracking an unmanned aerial vehicle at 122 m away with an offset distance of ±26.7 mm. We believe this system offers great potential in high-power, long-distance dynamic laser power transmission.

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