State Preparation in a Cold Atom Clock by Optical Pumping

Duan, Yu-Xiong; Wang, Bin; Xiang, Jinhua; Liu, Qian; Qu, Qiuzhi; Lü, Desheng; Liu, Liang

doi:10.1088/0256-307x/34/7/073201

Cited by 6 publications

(5 citation statements)

References 17 publications

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“…Furthermore, the width of the resonance peaks in the Raman spectrum can be used to calculate the temperature of the atomic group before the Raman pulse, where the calculation results are 3.0 μK in the M-R method and 4.9 μK in the O-M-R method. Given the average scattered photon number was about n phot ≈ 15, the optical pumping effect would lead to additional heating of the atomic group which can be calculated as ΔT T recoil n phot /3 1.8 μK (T recoil is the recoil temperature of 87 Rb) [31,32], which are consistent with the experimental results. Consequently, the use of optical pumping will bring a large increase in the number of atoms but also a significant increase in the temperature of atoms.…”

Section: Resultssupporting

confidence: 82%

“…By combining microwave and Raman light during state preparation, the advantages of both can be realized [3,26,27]. In addition, the optical pumping light can be used to pump atoms through spontaneous emissions by employing appropriate polarization [28][29][30][31][32]. This pumping regime not only significantly increases the atomic number but also introduces additional heating effects.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Experiment and analysis of state preparation for atom interferometry

Zhang,

Li,

Zhang

et al. 2024

Front. Phys.

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The state preparation is a crucial procedure in atom interferometry; however, there is a shortage of detailed experimental studies on determining the optimal method for achieving this. This paper investigates and compares two methods for state preparation: the combined use of microwave and Raman light (M-R) and the combined use of optical pumping, microwave, and Raman light (O-M-W). The experimental results demonstrate that the M-R method improves the efficiency of Raman transitions for atom interference, which is helpful in enhancing the contrast of the interference fringes. The O-M-R method increases the quantity of prepared atoms, thereby enhancing the signal-to-noise ratio of the detected signals. This work helps provide a useful experimental basis and reference for researchers to design a suitable state preparation scheme.

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Section: Resultssupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Experiment and analysis of state preparation for atom interferometry

Zhang,

Li,

Zhang

et al. 2024

Front. Phys.

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“…The repump frequency is also simultaneously changed to 6.83 GHz to resonantly drive the F =1 F’ =2 transition. Due to selection rules this pumps of the atoms into the 5 , clock state 34 as seen by the almost complete elimination of the transitions, when scanning the microwave detuning, increasing the contrast of the resulting clock signal. A diagram of all atomic transitions utilised in the experiment is shown in Fig.…”

Section: Methodsmentioning

confidence: 99%

A cold-atom Ramsey clock with a low volume physics package

Bregazzi,

Batori,

Lewis

et al. 2024

Sci Rep

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We demonstrate a Ramsey-type microwave clock interrogating the 6.835 GHz ground-state transition in cold $$^{87}$$ 87 Rb atoms loaded from a grating magneto-optical trap (GMOT) enclosed in an additively manufactured loop-gap resonator microwave cavity. A short-term stability of $$1.5 \times 10^{-11} \tau ^{-1/2}$$ 1.5 × 10 - 11 τ - 1 / 2 is demonstrated, in reasonable agreement with predictions from the signal-to-noise ratio of the measured Ramsey fringes. The cavity-grating package has a volume of $$\approx $$ ≈ 67 cm$$^{3}$$ 3 , ensuring an inherently compact system while the use of a GMOT drastically simplifies the optical requirements for laser cooled atoms. This work is another step towards the realisation of highly compact portable cold-atom frequency standards.

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“…We use a two-frequency optical pumping setup 47,48 The coefficient  is the ratio of the average intensities of the magnetic field near the ensemble and the probe coils, which is calculated to be 0.024 in our experiment. The change in the inhomogeneous magnetic field during 20 μs of storage is estimated to be on the order of O(~1*10 -4…”

Section: State Preparation (Sp)mentioning

confidence: 99%

Synchronized resistance of inhomogeneous magnetically induced dephasing of an image stored in a cold atomic ensemble

Zeng

et al. 2021

Phys. Rev. A

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Long-lived storage of arbitrary transverse multimodes is important for establishing a highchannel-capacity quantum network. Most of the pioneering works focused on atomic diffusion as the dominant impact on the retrieved pattern in an atom-based memory. In this work, we demonstrate that the unsynchronized Larmor precession of atoms in the inhomogeneous magnetic field dominates the distortion of the pattern stored in a cold-atom-based memory. We find that this distortion effect can be eliminated by applying a strong uniform polarization magnetic field. By preparing atoms in magnetically insensitive states, the destructive interference between different spin-wave components is diminished, and the stored localized patterns are synchronized further in a single spin-wave component; then, an obvious enhancement in preserving patterns for a long time is obtained. The reported results are very promising for studying transverse multimode decoherence in storage and high-dimensional quantum networks in the future.

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State Preparation in a Cold Atom Clock by Optical Pumping

Cited by 6 publications

References 17 publications

Experiment and analysis of state preparation for atom interferometry

Experiment and analysis of state preparation for atom interferometry

A cold-atom Ramsey clock with a low volume physics package

Synchronized resistance of inhomogeneous magnetically induced dephasing of an image stored in a cold atomic ensemble

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