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Single layer atom chip for magnetically trapping one-dimensional array of ultracold atoms 被引量:1
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作者 程峰 颜波 +1 位作者 柯敏 王育竹 《Chinese Physics B》 SCIE EI CAS CSCD 2010年第8期338-343,共6页
We propose a wire configuration to create a one-dimensional (1D) array of magnetic microtraps for trapping ultracold atoms. The configuration is formed by replacing the central part of the Z-wire pattern with a zigz... We propose a wire configuration to create a one-dimensional (1D) array of magnetic microtraps for trapping ultracold atoms. The configuration is formed by replacing the central part of the Z-wire pattern with a zigzag wire. We simulate the performance of this pattern by the finite element method which can take both the width and depth of the wire into consideration. The result of simulation shows that this configuration can create magnetic microtraps which can be separated and combined by changing bias magnetic field. We manage to split Z-wire trap and prove that similar result can occur for the new wire configuration. The fabrication processes of the atom chip are also introduced. Finally we discuss the loading method. 展开更多
关键词 atom chip magnetic micro-trap array magnetic lattices
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Archimedean-Spiral-Based Microchip Ring Waveguide for Cold Atoms 被引量:1
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作者 蒋小军 李晓林 +2 位作者 许忻平 张海潮 王育竹 《Chinese Physics Letters》 SCIE CAS CSCD 2015年第2期1-4,共4页
We present a scheme for generating a ring magnetic waveguide on a single-layer atom chip. The wire layout consists of two interleaved Archimedean spirals of the same size. The waveguide avoids the trapping perturbatio... We present a scheme for generating a ring magnetic waveguide on a single-layer atom chip. The wire layout consists of two interleaved Archimedean spirals of the same size. The waveguide avoids the trapping perturbation caused by the input and output ports, resulting in an enclosed guiding loop for neutral atoms in weak-field seeking states. Such a configuration can create a tight and deep trap potential with a small current. Taking the [F = 2, mF =2} state of 87Rb as an example, the trap frequency and depth are estimated to be 18kHz and 335 μK, respectively, with adc current of 2 A. 展开更多
关键词 Archimedean-Spiral-Based Microchip Ring Waveguide for Cold Atoms
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Continuous Dynamic Rotation Measurements Using a Compact Cold Atom Gyroscope 被引量:12
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作者 姚战伟 鲁思滨 +4 位作者 李润兵 王锴 曹雷 王谨 詹明生 《Chinese Physics Letters》 SCIE CAS CSCD 2016年第8期41-44,共4页
We present an experimental demonstration of the rotation measurement using a compact cold atom gyroscope. Atom interference fringes are observed in the stationary frame and the rotating frame, respectively. The phase ... We present an experimental demonstration of the rotation measurement using a compact cold atom gyroscope. Atom interference fringes are observed in the stationary frame and the rotating frame, respectively. The phase shift and contrast of the interference fringe are experimentally investigated. The results show that the contrast of the interference fringe is well held when the platform is rotated, and the phase shift of the interference fringe is linearly proportional to the rotation rate of the platform. The long-term stability, which is evaluated by the overlapped Allan deviation, is 8.5 × 10^-6 rad/s over the integrating time of 1000s. 展开更多
关键词 of on as is in Continuous Dynamic Rotation Measurements Using a Compact Cold Atom Gyroscope
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A Single Folded Beam Magneto-Optical Trap System for Neutral Mercury Atoms 被引量:1
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作者 刘亢亢 赵儒臣 +6 位作者 苟维 付小虎 刘洪力 尹士奇 孙剑芳 徐震 王育竹 《Chinese Physics Letters》 SCIE CAS CSCD 2016年第7期38-41,共4页
Mercury is a promising candidate for the optical lattice clock, due to its low sensitivity to the blackbody radiation. We develop a single folded beam magneto-optical trap for the neutral mercury optical lattice clock... Mercury is a promising candidate for the optical lattice clock, due to its low sensitivity to the blackbody radiation. We develop a single folded beam magneto-optical trap for the neutral mercury optical lattice clock, with a 253. 7nm frequency quadrupled laser. Up to 1.7 × 10^6 (202Hg) or 1.5 × 10^6 (199Hg) atoms can be captured, and the atom temperature is lowered to 170μK (202Hg) or 50μK (199Hg). The cold atom signals of all six rich abundant isotopes are observed in this system. 展开更多
关键词 for of Hg A Single Folded Beam Magneto-Optical Trap System for Neutral Mercury Atoms in is MOT
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Optimal transport of cold atoms by modulating the velocity of traps 被引量:1
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作者 韩景珊 许忻平 +1 位作者 张海潮 王育竹 《Chinese Physics B》 SCIE EI CAS CSCD 2013年第2期232-238,共7页
This work experimentally demonstrates a new method of optimizing the transport of cold atoms via modulating the velocity profile imposed on a magnetic quadrupole trap.The trap velocity and corresponding modulation are... This work experimentally demonstrates a new method of optimizing the transport of cold atoms via modulating the velocity profile imposed on a magnetic quadrupole trap.The trap velocity and corresponding modulation are controlled by varying the currents of two pairs of anti-Helmholtz coils.Cold 87Rb atoms are transported in a non-adiabatic regime over 22 mm in 200 ms.For the transported atoms their final-vibration amplitude dependences of modulation period number,depth,and initial phase are investigated.With modulation period n = 5,modulation depth K = 0.55,and initial phase φ = 0,cold atom clouds with more atom numbers,smaller final-vibration amplitude,and lower temperature are efficiently transported.Theoretical analysis and numerical simulation are also provided,which are in good agreement with experimental results. 展开更多
关键词 transport of cold atoms MODULATION velocity profile
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Demonstration of a cold atom beam splitter on atom chip 被引量:1
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作者 蒋小军 李晓林 +1 位作者 张海潮 王育竹 《Chinese Physics B》 SCIE EI CAS CSCD 2016年第8期77-80,共4页
We report an experimental demonstration of a new scheme to split cold atoms on an atom chip. The atom chip consists of a U-wire and a Z-wire. The cold atom cloud is initially loaded and prepared in the Z-trap, which i... We report an experimental demonstration of a new scheme to split cold atoms on an atom chip. The atom chip consists of a U-wire and a Z-wire. The cold atom cloud is initially loaded and prepared in the Z-trap, which is split into two separate parts by switching on the current of the U-wire. The two separate atom clouds have a distance more than one millimeter apart from each other and show almost symmetrical profiles, corresponding to about a 50/50 splitting ratio. 展开更多
关键词 beam splitter cold atoms atom chip
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Coherent Population Trapping-Ramsey Interference in Cold Atoms 被引量:1
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作者 陈曦 杨国卿 +1 位作者 王谨 詹明生 《Chinese Physics Letters》 SCIE CAS CSCD 2010年第11期51-54,共4页
We demonstrate an experimental observation of coherent population trapping-Ramsey interference in cold 87Rb atoms by employing the time-domain separated oscillatory fields' method. The interference fringe with line w... We demonstrate an experimental observation of coherent population trapping-Ramsey interference in cold 87Rb atoms by employing the time-domain separated oscillatory fields' method. The interference fringe with line width of 80 Hz is obtained. We propose a novel method to measure the cold atom number. The measurement is insensitive to the pump beam intensity, the single photon detuning and even the initial state population. We use this method to normalize the interference signal and to improve the signal-to-noise ratio significantly. 展开更多
关键词 Atomic and molecular physics Optics quantum optics and lasers
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Measurement of Local Gravity via a Cold Atom Interferometer 被引量:26
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作者 ZHOU Lin 《Chinese Physics Letters》 SCIE CAS CSCD 2011年第1期78-81,共4页
We demonstrate a precision measurement of local gravity acceleration 9 in Wuhan by a compact cold atom interferometer. The atom interferometer is in vertical Mach-Zehnder configuration realized using a 7r /2 - π - π... We demonstrate a precision measurement of local gravity acceleration 9 in Wuhan by a compact cold atom interferometer. The atom interferometer is in vertical Mach-Zehnder configuration realized using a 7r /2 - π - π /2 Raman pulse sequence. Cold atoms were prepared in a magneto-optical trap, launched upward to form an atom fountain, and then coherently manipulated to interfere by stimulated Raman transition. Population signal vs Raman laser phase was recorded as interference fringes, and the local gravity was deduced from the interference signal. We have obtained a resolution of 7 × 10-9g after an integration time of 236s under the best vibrational environment conditions. The absolute g value was derived from the chirp rate with a difference of 1.5 × 10--07 g compared to the gravity reference value. The tidal phenomenon was observed by continuously monitoring the local gravity over 123 h. 展开更多
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Demonstration of a Sagnac-Type Cold Atom Interferometer with Stimulated Raman Transitions 被引量:13
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作者 王平 李润兵 +2 位作者 颜辉 王谨 詹明生 《Chinese Physics Letters》 SCIE CAS CSCD 2007年第1期27-30,共4页
Cbld-matter-wave Sagnac interferometers possess many advantages over their thermal atomic beam counterparts when they are used as precise inertial sensors. We report a realization of a Sagnac-type interferometer with ... Cbld-matter-wave Sagnac interferometers possess many advantages over their thermal atomic beam counterparts when they are used as precise inertial sensors. We report a realization of a Sagnac-type interferometer with cold atoms. Cold rubidium atoms are prepared in a magneto-optical trap and are pushed by resonant laser pulse to form slow atomic beam. In the interference region, atomic wave packets are coherently manipulated using π/2 -π - π/2 Raman pulse sequences. Interference fringes with maximum contrast of 37% are observed experimentally. 展开更多
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State Preparation in a Cold Atom Clock by Optical Pumping 被引量:1
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作者 段玉雄 汪斌 +4 位作者 项静峰 刘乾 屈求智 吕德胜 刘亮 《Chinese Physics Letters》 SCIE CAS CSCD 2017年第7期66-70,共5页
We implement optical pumping to prepare cold atoms in our prototype of the ST Rb space cold atom clock, which operates in the one-way mode. Several modifications are made on our previous physical and optical system. T... We implement optical pumping to prepare cold atoms in our prototype of the ST Rb space cold atom clock, which operates in the one-way mode. Several modifications are made on our previous physical and optical system. The effective atomic signal in the top detection zone is increased to 2.5 times with 87% pumping efficiency. The temperature of the cold atom cloud is increased by 1.4 μK. We study the dependences of the effective signal gain and pumping efficiency on the pumping laser intensity and detuning. The effects of σ transition are discussed. This technique may be used in the future space cold atom clocks. 展开更多
关键词 State Preparation in a Cold Atom Clock by Optical Pumping
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Enhanced Quantum Reflection of Ultracold Atoms with Strong Interatomic Interaction
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作者 刘敏 詹明生 《Chinese Physics Letters》 SCIE CAS CSCD 2008年第9期3154-3157,共4页
We calculate the reflection probability for ultracold alkali atoms incident on a solid surface. By considering the interatomic interaction and using the WKB method, it is shown that the repulsive interaction between a... We calculate the reflection probability for ultracold alkali atoms incident on a solid surface. By considering the interatomic interaction and using the WKB method, it is shown that the repulsive interaction between atoms has the effect of increasing the reflection probability. The increasing amplitude is related with the interatomic interaction and the depth of atom-surface potential. In addition, we also perform a numerical calculation to testify the effect of the interatomic interaction, and the analytic result is proven by the numerical result. 展开更多
关键词 the power-law exponents PRECIPITATION durative abrupt precipitation change
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Superexchange-mediated magnetization dynamics with ultracold alkaline-earth atoms in an optical lattice
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作者 朱少兵 钱军 王育竹 《Chinese Physics B》 SCIE EI CAS CSCD 2017年第4期344-350,共7页
Superexchange and inter-orbital spin-exchange interactions are key ingredients for understanding(orbital) quantum magnetism in strongly correlated systems and have been realized in ultracold atomic gases.Here we stu... Superexchange and inter-orbital spin-exchange interactions are key ingredients for understanding(orbital) quantum magnetism in strongly correlated systems and have been realized in ultracold atomic gases.Here we study the spin dynamics of ultracold alkaline-earth atoms in an optical lattice when the two exchange interactions coexist.In the superexchange interaction dominating regime,we find that the time-resolved spin imbalance shows a remarkable modulated oscillation,which can be attributed to the interplay between local and nonlocal quantum mechanical exchange mechanisms.Moreover,the filling of the long-lived excited atoms affects the collapse and revival of the magnetization dynamics.These observations can be realized in state-dependent optical lattices combined with the state-of-the-art advances in optical lattice clock spectroscopy. 展开更多
关键词 alkaline-earth atoms spin dynamics SPIN-EXCHANGE SUPEREXCHANGE
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Enhancement of Transfer Efficiency of Cold Atoms Using an Optical Guiding Laser Beam
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作者 李可 王晓锐 +2 位作者 贺凌翔 詹明生 吕宝龙 《Chinese Physics Letters》 SCIE CAS CSCD 2007年第9期2562-2565,共4页
We transfer cold ^87 Rb atoms from a vapour cell chamber to a spatially separated UHV magneto-optical trap (MOT) with the assistance of a red-detuned optical guiding beam and a normal push beam. Efficient optical gu... We transfer cold ^87 Rb atoms from a vapour cell chamber to a spatially separated UHV magneto-optical trap (MOT) with the assistance of a red-detuned optical guiding beam and a normal push beam. Efficient optical guiding of the cold atoms is observed within a small detuning window. A pulsed optical guiding beam enhances the transfer efficiency and hence allows us to collect more atoms in UHV MOT in a shorter time, which is favourable for our experiment of achieving Bose-Einstein condensates (BEC). Besides the easy operation, another advantage of this optical guiding technique is also demonstrated such that slower atomic beams may be efficiently transferred along horizontal direction. This study is a direct application of the optical guiding technique as a powerful tool. 展开更多
关键词 coated conductor buffer layer self-epitaxy CEO2
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A Radio-frequency Atomchip for Neutral Atoms
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作者 Xiaolin Li Min Ke +2 位作者 Bo Yan Haichao Zhang Yuzhu Wang 《量子光学学报》 CSCD 北大核心 2006年第B08期73-73,共1页
关键词 射电频率 中性原子 磁阱 场梯度 复杂结构
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Electromagnetically induced transparency in a Zeeman-sublevels Λ-system of cold ^87Rb atoms in free space
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作者 蒋小军 张海潮 王育竹 《Chinese Physics B》 SCIE EI CAS CSCD 2016年第3期200-204,共5页
We report the experimental investigation of electromagnetically induced transparency (EIT) in a Zeeman-sublevels A-type system of cold 87Rb atoms in free space. We use the Zeeman substates of the hyperfine energy st... We report the experimental investigation of electromagnetically induced transparency (EIT) in a Zeeman-sublevels A-type system of cold 87Rb atoms in free space. We use the Zeeman substates of the hyperfine energy states 52 S 1/2, F =- 2 and 52P3/2, F1 = 2 of 87Rb D2 line to form a A-type EIT scheme. The EIT signal is obtained by scanning the probe light over 1 MHz in 4 ms with an 80 MHz arbitrary waveform generator. More than 97% transparency and 100 kHz EIT window are observed. This EIT scheme is suited for an application of pulsed coherent storage atom clock (Yan B, et al. 2009 Phys. Rev. A 79 063820). 展开更多
关键词 electromagnetically induced transparency Zeeman-sublevels cold atoms
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A Single-Layer Magnetic Atom Chip for Trapping an Array of Bose-Einstein Condensate
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作者 李晓林 柯敏 +1 位作者 颜波 王育竹 《Chinese Physics Letters》 SCIE CAS CSCD 2007年第6期1545-1548,共4页
We propose a simple single-layer magnetic microtrap configuration which can trap an array of magneticallytrapped Bose-Einstein condensate. The configuration consists of two series of parallel wires perpendicular to ea... We propose a simple single-layer magnetic microtrap configuration which can trap an array of magneticallytrapped Bose-Einstein condensate. The configuration consists of two series of parallel wires perpendicular to each other and all of the crossing points are cut off for maintaining the uniformity of the current. We analyse the trapping potential, the position of trapping centres and the uniformity of the array of the traps. The trapping depth and trapping frequency with different parameters are also calculated. Lastly, the effect of the cut-off crossing points, dissipate power, chip production are introduced concisely. 展开更多
关键词 TRAPS LATTICES
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Microwave coherent manipulation of cold atoms in optically induced fictitious magnetic traps on an atom chip
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作者 周锋 李潇 +2 位作者 柯敏 王谨 詹明生 《Chinese Physics B》 SCIE EI CAS CSCD 2017年第9期98-105,共8页
We propose a novel on-chip platform for controlling and manipulating cold atoms precisely and coherently. The scheme is achieved by producing optically induced fictitious magnetic traps(OFMTs) with 790 nm(for -(87... We propose a novel on-chip platform for controlling and manipulating cold atoms precisely and coherently. The scheme is achieved by producing optically induced fictitious magnetic traps(OFMTs) with 790 nm(for -(87)Rb) circularly polarized laser beams and state-dependent potentials simultaneously for two internal atomic states with microwave coplanar waveguides. We carry out numerical calculations and simulations for controlled collisional interactions between OFMTs and addressable single atoms' manipulation on our designed hybrid atom chips. The results show that our proposed platform is feasible and flexible, which has wide applications including collisional dynamics investigation, entanglement generation,and scalable quantum gates implementation. 展开更多
关键词 atom chips microwave fictitious magnetic field coherent manipulation
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Observation of Atomic Dynamic Behaviors in the Evaporative Cooling by In-Situ Imaging the Plugged Hole of Ultracold Atoms
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作者 Tian-You Gao Dong-Fang Zhang +2 位作者 Ling-Ran Kong Rui-Zong Li Kai-Jun Jiang 《Chinese Physics Letters》 SCIE CAS CSCD 2018年第8期58-61,共4页
We experimentally observe the dynamic evolution of atoms in the evaporative cooling, by in-situ imaging the plugged hole of ultracold atoms. Ultracold rubidium atoms confined in a magnetic trap are plugged using a blu... We experimentally observe the dynamic evolution of atoms in the evaporative cooling, by in-situ imaging the plugged hole of ultracold atoms. Ultracold rubidium atoms confined in a magnetic trap are plugged using a blue-detuned laser beam with a waist of 20 m at a wavelength of 767 nm. We probe the variation of the atomic temperature and width versus the radio frequency in the evaporative cooling. Both the behaviors are in good agreement with the calculation of the trapping potential dressed by the rf signal above the threshold temperature,while deviating from the calculation near the phase transition. To accurately obtain the atomic width, we use the plugged hole as the reference to optimize the optical imaging system by precisely minimizing the artificial structures due to the defocus effect. 展开更多
关键词 Observation of Atomic Dynamic Behaviors in the Evaporative Cooling by In-Situ Imaging the Plugged Hole of Ultracold Atoms
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Time-energy distribution of photoelectron from atomic states with different magnetic quantum numbers in elliptically polarized laser fields
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作者 Jingyang Xu Li Guo +4 位作者 Xin Qi Ronghua Lu Min Zhang Jingtao Zhang Jing Chen 《Chinese Physics B》 SCIE EI CAS CSCD 2024年第9期374-382,共9页
A Wigner-distribution-like(WDL)function based on the strong-field approximation(SFA)theory is used to investigate the ionization time of the photoelectron emitted from the initial states with different magnetic quantu... A Wigner-distribution-like(WDL)function based on the strong-field approximation(SFA)theory is used to investigate the ionization time of the photoelectron emitted from the initial states with different magnetic quantum number m in elliptically polarized electric fields.The saddle-point method is adopted for comparisons.For different m states,a discrepancy exists in the WDL distributions of the photoelectrons emitted in a direction close to the major axis of the laser field ellipse.Based on the saddle-point analysis,this discrepancy can be ascribed to the interference between electrons ionized from two tunneling instants.Our results show that the relationships between the tunneling instants and kinetic energy of photoelectrons are the same for different m initial states when the Coulomb potential is not considered.Our work sheds some light on the ionization-time information of electrons from different magnetic quantum states. 展开更多
关键词 strong-field ionization Wigner-distribution-like ionization instant
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Precision measurement with atom interferometry 被引量:4
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作者 王谨 《Chinese Physics B》 SCIE EI CAS CSCD 2015年第5期93-102,共10页
Development of atom interferometry and its application in precision measurement are reviewed in this paper. The principle, features and the implementation of atom interferometers are introduced, the recent progress of... Development of atom interferometry and its application in precision measurement are reviewed in this paper. The principle, features and the implementation of atom interferometers are introduced, the recent progress of precision measurement with atom interferometry, including determination of gravitational constant and fine structure constant, measurement of gravity, gravity gradient and rotation, test of weak equivalence principle, proposal of gravitational wave detection, and measurement of quadratic Zeeman shift are reviewed in detail. Determination of gravitational redshift, new definition of kilogram, and measurement of weak force with atom interferometry are also briefly introduced. 展开更多
关键词 cold atom atom interferometry precision measurement
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