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Improve the performance of interferometer with ultra-cold atoms

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

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Production of ^(87)Rb Bose Einstein condensates in a hybrid trap

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Chinese Physics B 2013年第5期22卷 417-420页

作者：段亚凡姜伯楠孙剑芳刘亢亢徐震王育竹 Key Laboratory for Quantum Optics Shanghai Institute of Optics and Fine MechanicsChinese Academy of Sciences

We report a rapid evaporative cooling method using a hybrid trap which is composed of a quadrupole magnetic trap and a one-beam optical dipole trap. It contains two kinds of evaporative coolings to reach the quantum degeneracy： initial radio-frequency （RF） enforced evaporative cooling in the quadrupole magnetic trap and further runaway evaporative cooling in the optical dipole trap. The hybrid trap does not require a very high power laser such as that in the traditional pure optical trap, but still has a deep trap depth and a large trap volume, and has better optical access than the normal magnetic trap like the quadrupole-Ioffe-configuration （QUIC） cloverleaf trap. A high trap frequency can be easily realized in the hybrid trap to enhance the elastic collision rate and shorten the evaporative cooling time. In our experiment, pure Bose-Einstein condensates （BECs） with about 1 x 105 atoms can be realized in 6 s evaporative cooling in the optical dipole trap.

关键词： ultra-cold atoms Bose-Einstein condensates optical dipole trap hybrid trap

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Effects of Interactions and Temperature in Disordered ultra-cold Bose Gases

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Journal of Modern Physics 2014年第8期5卷 661-672页

作者： Clemens Adolphs Joseph Towers Marie Piraud Konstantine V.Krutitsky David A.W.Hutchinson The Jack Dodd Centre for Quantum Technology Department of PhysicsUniversity of OtagoDunedinNew Zealand Department of Physics and Astronomy University of British ColumbiaVancouverCanada Laboratoire Charles Fabry Institut d’OptiqueCentre National de la Recherche ScientifiqueUniversite Paris SudPalaiseauFrance Fachbereich Physik der Universitat Duisburg-Essen Campus DuisburgDuisburgGermany Centre for Quantum Technologies National University of SingaporeSingapore

We simulate ultra-cold interacting bosons in quasi-one-dimensional, incommensurate optical lattices. In the tight-binding limit, these lattices have pseudo-random on-site energies and thus can potentially lead to Anderson localization. We use the Hartree-Fock-Bogoliubov formalism in the Bose-Hubbard model to explore the parameter regimes that lead to exponential localization of the ground state in a 3-colour optical lattice and investigate the role of repulsive interactions, harmonic confinement and finite temperature.

关键词： ultra-cold atoms Anderson Localization Disorder Optical Lattice

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