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Rapid extraction of the phase shift of the cold-atom interferometer via phase demodulation

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Chinese Physics B 2015年第11期24卷 250-254页

作者：程冰王兆英许翱鹏王启宇林强 Institute of Optics Department of Physics Zhejiang University Center for Optics and Optoelectronics Research College of Science Zhejiang University of Technology

Generally, the phase of the cold-atom interferometer is extracted from the atomic interference fringe, which can be obtained by scanning the chirp rate of the Raman lasers at a given interrogation time T. If mapping the phase shift for each T with a series of measurements, the extraction time is limited by the protocol of each T measurement, and therefore increases dramatically when doing fine mapping with a small step of T. Here we present a new method for rapid extraction of the phase shift via phase demodulation. By using this method, the systematic shifts can be mapped though the whole interference area. This method enables quick diagnostics of the potential cause of the phase shift in specific time. We demonstrate experimentally that this method is effective for the evaluation of the systematic errors of the cold atomic gravimeter. The systematic phase error induced by the quadratic Zeeman effect in the free-falling region is extracted by this method. The measured results correspond well with the theoretic prediction and also agree with the results obtained by the fringe fitting method for each T.

关键词： atom interferometer phase extraction phase demodulation

Wave–particle duality in a Raman atom interferometer

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Chinese Physics B 2015年第8期24卷 166-169页

作者：贾爱爱杨俊颜树华胡青青罗玉昆朱诗尧 College of Mechatronic Engineering and Automation National University of Defense Technology Beijing Computational Science Research Center

We theoretically investigate the wave–particle duality based on a Raman atom interferometer, via the interaction between the atom and Raman laser, which is similar to the optical Mach–Zehnder interferometer. The wave and which-way information are stored in the atomic internal states. For the φ- π- π /2 type of atom interferometer, we find that the visibility(V) and predictability(P) still satisfy the duality relation, P2+ V2≤ 1.

关键词： complementarity wave–particle duality atom interferometer Raman pulse

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

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Chinese Physics B 2020年第7期29卷 77-84页

作者： Wei-Tao Duan Chuan He Si-Tong Yan Yu-Hang Ji Lin Zhou Xi Chen Jin Wang Ming-Sheng Zhan 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 *** this paper,the problem of Coriolis error in WEP test is studied theoretically and *** theoretical simulation,the Coriolis effect is analyzed by establishing an error *** 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 *** 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^-*** 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

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

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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

Systematic error suppression scheme of the weak equivalence principle test by dual atom interferometers in space based on spectral correlation

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Chinese Physics B 2020年第11期29卷 197-202页

作者： Jian-Gong Hu Xi Chen Li-Yong Wang Qing-Hong Liao Qing-Nian Wang School of Information Engineering Nanchang UniversityNanchang 330031China State Key Laboratory of Magnetic Resonance and atomic and Molecular Physics Wuhan Institute of Physics and MathematicsWuhan 430071China Center for Cold atom Physics Chinese Academy of SciencesWuhan 430071China Center for Optics Research and Engineering Shandong UniversityQingdao 266237China School of Information Science and Engineering Shandong UniversityQingdao 266237China

Systematic error suppression and test data processing are very important in improving the accuracy and sensitivity of the atom interferometer(AI)-based weak-equivalence-principle(WEP) test in space. Here we present a spectrum correlation method to investigate the test data of the AI-based WEP test in space by analyzing the characteristics of systematic errors and noises. The power spectrum of the Eotvos coefficient η, systematic errors, and noises in AI-based WEP test in space are analyzed and calculated in detail. By using the method, the WEP violation signal is modulated from direct current(DC) frequency band to alternating current(AC) frequency band. We find that the signal can be effectively extracted and the influence of systematic errors can be greatly suppressed by analyzing the power spectrum of the test data when the spacecraft is in an inertial pointing mode. Furthermore, the relation between the Eotvos coefficient η and the number of measurements is obtained under certain simulated parameters. This method will be useful for both isotopic and nonisotopic AI-based WEP tests in space.

关键词： atom interferometer weak equivalence principle spectral correlation systematic error

Improve the performance of interferometer with ultra-cold atoms

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Chinese Physics B 2021年第1期30卷 42-55页

作者： Xiangyu Dong Shengjie Jin Hongmian Shui Peng Peng Xiaoji Zhou State Key Laboratory of Advanced Optical Communication Systems and Networks Department of ElectronicsPeking UniversityBeijing 100871China

Ultra-cold atoms provide ideal platforms for *** macroscopic matter-wave property of ultra-cold atoms leads to large coherent length and long coherent time,which enable high accuracy and sensitivity to ***,we review our efforts to improve the performance of the *** demonstrate a shortcut method for manipulating ultra-cold atoms in an optical *** with traditional ones,this shortcut method can reduce the manipulation time by up to three orders of *** 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 *** have also been made to enhance the resolution by multimode *** 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 *** 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 ***,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

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

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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 *** gravitational potential generated from the high-intensity laser is solved from the Einstein field equation under the Newtonian *** compute the strength of the gravitational force and study the feasibility of measuring the force by the atom *** intense laser field from the laser pulse can induce a phase change in the interferometer with Bose-Einstein *** 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

Movable precision gravimeters based on cold atom interferometry

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Chinese Physics B 2020年第9期29卷 70-78页

作者： Jiong-Yang Zhang Le-Le Chen Yuan Cheng Qin Luo Yu-Biao Shu Xiao-Chun Duan Min-Kang Zhou Zhong-Kun Hu 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 *** on applying this innovative technology to field applications are also being made *** 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 *** 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

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

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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