Implementation of a double-path multimode interferometer using a spinor Bose-Einstein condensate

Tang, Pengju; Dong, Xiangyu; Zhang, Wenjun; Li, Yunhong; Chen, Xuzong; Zhou, Xianju

doi:10.1103/physreva.101.013612

“…With the number of paths increased, it will suppress the noise and improve the resolution (25, 26, 69-72) compared with the conventional double-path single-mode structure. The results show that resolution of the phase measurements is increased nearly twice in time domain interferometric fringes (68).…”

Section: Implementation Of a Double-path Multimode Interferometer Usi...mentioning

confidence: 87%

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

Dong,

Jin,

Shui

et al. 2021

Preprint

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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 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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“…The 87 Rb BECs are prepared in a hybrid optical-magnetic trap, which contains a 1064 nm laser beam along the x-direction (the x-direction is shown in Fig. 1(a)), providing an optical dipole trap, and a gradient magnetic field [26,27,44]. With harmonic trapping frequencies of (𝜔 𝑥 , 𝜔 𝑦 , 𝜔 𝑧 ) = 2π × (28, 55, 60) Hz, we obtain a nearly pure BEC with 2 × 10 5 atoms populated on the |𝐹 = 2, 𝑚 𝐹 = +2 state.…”

Section: Experiments Descriptionmentioning

confidence: 99%

Atomic Ramsey interferometry with S- and D-band in a triangular optical lattice

Dong¹,

Wu²,

Yu³

et al. 2022

Opt. Express

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Ramsey interferometers have wide applications in science and engineering. Compared with the traditional interferometer based on internal states, the interferometer with external quantum states has advantages in some applications for quantum simulation and precision measurement. Here, we develop a Ramsey interferometry with Bloch states in S- and D-band of a triangular optical lattice for the first time. The key to realizing this interferometer in two-dimensionally coupled lattice is that we use the shortcut method to construct π/2 pulse. We observe clear Ramsey fringes and analyze the decoherence mechanism of fringes. Further, we design an echo π pulse between S- and D-band, which significantly improves the coherence time. This Ramsey interferometer in the dimensionally coupled lattice has potential applications in the quantum simulations of topological physics, frustrated effects, and motional qubits manipulation.

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“…The results show that the resolution of the phase measurements is increased nearly twice in time domain interferometric fringes. [68] The experimental procedure is similar to the previous one. The major difference lies in the splitting stage, the optical harmonic trap participating in the preparation of the condensates is not going to switch off until the TOF stage, thus the Stern-Gerlach process in the gradient magnetic field mentioned above cannot significantly split the wave packets.…”

Section: Parallel Multicomponent Interferometer With a Spinormentioning

confidence: 99%

“…The fringe in each color represents the interference between the two wave packets of a single mode. Reproduced with permission from Ref [68]…”

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confidence: 99%

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Improve the performance of interferometer with ultra-cold atoms*

Dong¹,

Jin²,

Shui³

et al. 2021

Self Cite

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 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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Implementation of a double-path multimode interferometer using a spinor Bose-Einstein condensate

Cited by 4 publications

References 40 publications

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

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

Atomic Ramsey interferometry with S- and D-band in a triangular optical lattice

Improve the performance of interferometer with ultra-cold atoms*

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