检索结果-南通市图书馆

Suppression of Coriolis error in weak equivalence principle test using ^85Rb-^87Rb dual-species atom interferometer

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2020年第7期29卷 77-84页

作者：段维涛何川闫思彤冀宇航周林陈曦王谨詹明生 State Key Laboratory of Magnetic Resonance and atomic and Molecular Physics Innovation Academy for Precision Measurement Science and TechnologyChinese Academy of Sciences-Wuhan National Laboratory for OptoelectronicsWuhan 430071China School of Physics University of Chinese Academy of SciencesBeijing 100049China Center for Cold atoms Physics Chinese Academy of SciencesWuhan 430071China

Coriolis effect is an important error source in the weak equivalence principle(WEP)test using atom interferometer.In this paper,the problem of Coriolis error in WEP test is studied theoretically and experimentally.In theoretical simulation,the Coriolis effect is analyzed by establishing an error model.The measurement errors of Eotvos coefficient(η)in WEP test related to experimental parameters,such as horizontal-velocity difference and horizontal-position difference of atomic clouds,horizontal-position difference of detectors,and rotation compensation of Raman laser’s mirror are calculated.In experimental investigation,the position difference between^85Rb and^87Rb atomic clouds is reduced to 0.1 mm by optimizing the experimental parameters,an alternating detection method is used to suppress the error caused by detection position difference,thus the Coriolis error related to the atomic clouds and detectors is reduced to 1.1 × 10^-9.This Coriolis error is further corrected by com pensating the rotation of Raman laser's mirror,and the total uncertainty o f rj measurement related to the Coriolis effect is reduced as δη=4.4 × 10^-11.

关键词： atom interferometer weak equivalence principle test Coriolis effect

Interference properties of a trapped atom interferometer in two asymmetric optical dipole traps

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2020年第12期29卷 227-232页

作者：王立勇李潇王坤鹏赵吟雪邸克杜佳佳胡建功 Center for Optics Research and Engineering(CORE) Shandong UniversityQingdao 266237China School of Information Science and Engineering Shandong UniversityQingdao 266237China State Key Laboratory of Magnetic Resonance and atomic and Molecular Physics Wuhan Institute of Physics and MathematicsAPMChinese Academy of SciencesWuhan 430071China Center for Cold atom Physics Chinese Academy of SciencesWuhan 430071China Wuhan Social Work Polytechnic Wuhan 430079China Chongqing University of Post and Telecommunications Chongqing 400065China School of Information Engineering Nanchang UniversityNanchang 330031China

We investigate interference properties of a trapped atom interferometer where two symmetric optical dipole traps(ODTs)act as the atomic wave-packets splitter and combiner with internal state labelling.After the preparation of initial superposition states,the atomic wave-packet is adiabatically split and moves into two spatially separate asymmetric ODTs.The atomic wave-packets in two ODTs are then adiabatically recombined after a duration of free evolving in traps,completing the interference cycle of this atom interferometer.We show that the interferogram exhibits a series of periodic revivals in interference visibility.Furthermore,the revival period decreases as the asymmetry of two dipole potentials increases.By introducing an echo sequence to the interferometer,we show that while the echo effect is not influenced by the asymmetry of the two ODTs,the onset of periodic revivals changes by the echo sequence.Our study provides an effective method to cancel or compensate the phase shift caused by position and time correlated force.

关键词： atom interferometer optical dipole traps revival echo sequence

Measuring gravitational effect of superintense laser by spin-squeezed Bose-Einstein condensates interferometer

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2022年第5期31卷 265-273页

作者： Eng Boon Ng C.H.Raymond Ooi Department of Physics University of MalayaKuala Lumpur 50603Malaysia

We consider an extremely intense laser,enclosed by an atom interferometer.The gravitational potential generated from the high-intensity laser is solved from the Einstein field equation under the Newtonian limit.We compute the strength of the gravitational force and study the feasibility of measuring the force by the atom interferometer.The intense laser field from the laser pulse can induce a phase change in the interferometer with Bose-Einstein condensates.We push up the sensitivity limit of the interferometer with Bose-Einstein condensates by spin-squeezing effect and determine the sensitivity gap for measuring the gravitational effect from intense laser by atom interferometer.

关键词： intense laser field atom interferometer Bose-Einstein condensates spin-squeezing

Magnetic-field-sensitive multi-wave interference

在线全文

学校读者我要写书评

暂无评论

Frontiers of physics 2023年第5期18卷 201-207页

作者： Wenhua Yan Xudong Ren Wenjie Xu Zhongkun Hu Minkang Zhou MOE Key Laboratory of Fundamental Physical Quantities Measurements Hubei Key Laboratory of Gravitation and Quantum PhysicsPGMF and School of PhysicsHuazhong University of Science and TechnologyWuhan 430074China Wuhan Institute of Quantum Technology Wuhan 430206China

We report an experimental study of magnetic-field-sensitive multi-wave interference,realized in a three-wave RF-atom system.In the F=1 hyperfine level of the ^(87)Rb 5^(2)S_(1/2) ground state,Ramsey fringes were observed via the spin-selective Raman detection.A decrease in the fringe contrast was observed with increasing free evolution time.The maximum evolution time for observable fringe contrasts was investigated at different atom temperatures,under free-falling and trapped conditions.As the main interest of the Ramsey method,the improvement in magnetic field resolution is observed with an increase of evolution time T up to 3 ms and with the measurement resolution reaching 0.85 nT.This study paves the way for precision magnetic field measurements based on cold atoms.

关键词： atom interferometer magnetometer cold atom device multi-wave interference

Movable precision gravimeters based on cold atom interferometry

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics B 2020年第9期29卷 70-78页

作者：张炯阳陈乐乐程源罗覃舒玉彪段小春周敏康胡忠坤 MOE Key Laboratory of Fundamental Physical Quantities Measurement&Hubei Key Laboratory of Gravitation and Quantum Physics PGMF and School of PhysicsHuazhong University of Science and TechnologyWuhan 430074China

High precision atom interferometers have shown attractive prospects in laboratory for testing fundamental physics and inertial sensing.Efforts on applying this innovative technology to field applications are also being made intensively.As the manipulation of cold atoms and related matching technologies mature,inertial sensors based on atom interferometry can be adapted to various indoor or mobile platforms.A series of experiments have been conducted and high performance has been achieved.In this paper,we will introduce the principles,the key technologies,and the applications of atom interferometers,and mainly review the recent progress of movable atom gravimeters.

关键词： atom interferometer absolute gravimeter precision measurement

Comparison of the sensitivities for atom interferometers in two different operation methods

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2018年第1期27卷 351-356页

作者：段小春毛德凯邓小兵周敏康邵成刚祝竺胡忠坤 MOE Key Laboratory of Fundamental Physical Quantities Measurements Hubei Key Laboratory of Gravitation and Quantum PhysicsSchool of Physics Huazhong University of Science and Technology Shanghai Institute of Satellite Engineering

We investigated the sensitivities of atom interferometers in the usual fringe-scanning method （FSM） versus the fringe- locking method （FLM）. The theoretical analysis shows that for typical noises in atom interferometers, the FSM will degrade the sensitivity while the FLM does not. The sensitivity-improvement factor of the FLM over the FSM depends on the type of noises, which is validated by numerical simulations. The detailed quantitative analysis on this fundamental issue is presented, and our analysis is readily extendable to other kinds of noises as well as other fringe shapes in addition to a cosine one.

关键词： atom interferometer fringe locking fringe scanning sensitivity

Improve the performance of interferometer with ultra-cold atoms

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2021年第1期30卷 42-55页

作者：董翔宇金圣杰税鸿冕彭鹏周小计 State Key Laboratory of Advanced Optical Communication Systems and Networks Department of ElectronicsPeking UniversityBeijing 100871China

Ultra-cold atoms provide ideal platforms for interferometry.The macroscopic matter-wave property of ultra-cold atoms leads to large coherent length and long coherent time,which enable high accuracy and sensitivity to measurement.Here,we review our efforts to improve the performance of the interferometer.We demonstrate a shortcut method for manipulating ultra-cold atoms in an optical lattice.Compared with traditional ones,this shortcut method can reduce the manipulation time by up to three orders of magnitude.We construct a matter-wave Ramsey interferometer for trapped motional quantum states and significantly increase its coherence time by one order of magnitude with an echo technique based on this method.Efforts have also been made to enhance the resolution by multimode scheme.Application of a noise-resilient multi-component interferometer shows that increasing the number of paths could sharpen the peaks in the time-domain interference fringes,which leads to a resolution nearly twice compared with that of a conventional double-path two-mode interferometer.With the shortcut method mentioned above,improvement of the momentum resolution could also be fulfilled,which leads to atomic momentum patterns less than 0.6hkL. To identify and remove systematic noises,we introduce the methods based on the principal component analysis (PCA) that reduce the noise in detection close to the 1/√2 of the photon-shot noise and separate and identify or even eliminate noises.Furthermore,we give a proposal to measure precisely the local gravity acceleration within a few centimeters based on our study of ultracold atoms in precision measurements.

关键词： precision measurement ultra-cold atoms atom interferometer gravity measurements

Micro-Gal level gravity measurements with cold atom interferometry

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2015年第5期24卷 32-43页

作者：周敏康段小春陈乐乐罗覃徐耀耀胡忠坤 MOE Key Laboratory of Fundamental Physical Quantities Measurements School of PhysicsHuazhong University of Science and Technology

Developments of the micro-Gal level gravimeter based on atom interferometry are reviewed, and the recent progress and results of our group are also presented. atom interferometric gravimeters have shown high resolution and accuracy for gravity measurements. This kind of quantum sensor has excited world-wide interest for both practical applications and fundamental research.

关键词： gravity measurements atom interferometer laser cooling and trapping precision measurements

Elementary analysis of interferometers for wave particle duality test and the prospect of going beyond the complementarity principle

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2014年第11期23卷 202-214页

作者：李志远 Laboratory of Optical Physics Institute of Physics Chinese Academy of Sciences

A distinct method to show a quantum object behaving both as wave and as particle is proposed and described in some detail. We make a systematic analysis using the elementary methodology of quantum mechanics upon Young＇s two-slit interferometer and the Mach-Zehnder two-arm interferometer with the focus placed on how to measure the interference pattern （wave nature） and the which-way information （particle nature） of quantum objects. We design several schemes to simultaneously acquire the which-way information for an individual quantum object and the high-contrast interference pattern for an ensemble of these quantum objects by placing two sets of measurement instruments that are well separated in space and whose perturbation of each other is negligibly small within the interferometer at the same time. Yet, improper arrangement and cooperation of these two sets of measurement instruments in the interferometer would lead to failure of simultaneous observation of wave and particle behaviors. The internal freedoms of quantum objects could be harnessed to probe both the which-way information and the interference pattern for the center-of-mass motion. That quantum objects can behave beyond the wave-particle duality and the complementarity principle would stimulate new conceptual examination and exploration of quantum theory at a deeper level.

关键词： wave-particle duality complementarity principle atom interferometer