Asymmetric superradiant scattering and abnormal mode amplification induced by atomic density distortion

Wang, Zhongkai; Niu, Linxiao; Zhang, Peng; Wen, Mingxuan; Fang, Zhen; Chen, Xuzong; Zhou, Xianju

doi:10.1364/oe.21.014377

“…The macroscopic coherent properties of ultra-cold atoms [28][29][30][31][32][33][34][35][36][37][38] are conducive to precise measurement. To make full use of the advantages of ultra-cold atomic coherence properties, one method is to reduce the manipulation time and another is to suppress the attenuation of coherence.…”

Section: Enhanced Resolution By Increasing Coherent Timementioning

confidence: 99%

Improve the performance of interferometer with ultra-cold atoms*

Dong¹,

Jin²,

Shui³

et al. 2021

Self Cite

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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 0.6 ℏkL . 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.

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“…The macroscopic coherent properties of ultra-cold atoms (29)(30)(31)(32)(33)(34)(35)(36)(37)(38)(39) are conducive to precise measurement. To make full use of the advantages of ultra-cold atomic coherence properties, one method is to reduce the manipulation time and another is to suppress the attenuation of coherence.…”

Section: Enhanced Resolution By Increasing Coherent Timementioning

confidence: 99%

Study to improve the performance of interferometer with ultra-cold atoms

Dong,

Jin,

Shui

et al. 2021

Preprint

Self Cite

0

View full text Add to dashboard Cite

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 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, im-1

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“…9,15 Recently, superradiant amplification of radiation is discussed in other media with different conditions, for example, quantum amplification by superradiant emission of radiation (QASER) is one of the last interesting works. [16][17][18][19] For the first time, SRA has been simulated in 1998 by Shvets et al 9 using the one-dimensional time averaged version of the PIC code VLPL (virtual laser plasma laboratory). They observed the amplification of the signal pulse during its evolution.…”

mentioning

confidence: 99%