An overview of the optically detected magnetic-state-selected cesium beam clock

Article Multidisciplinary Sciences

Resolving the gravitational redshift across a millimetre-scale atomic sample

Tobias Bothwell et al.

Summary: Einstein's theory of general relativity predicts that clocks run at different rates in different gravitational potential, known as gravitational redshift. Atomic clocks serve as fundamental tools to test this prediction and will eventually enable the study of the combination of general relativity and quantum mechanics. By measuring the gravitational redshift within a millimeter-scale sample of ultracold strontium, a new regime of clock operation is heralded, requiring corrections for gravitational perturbations.

NATURE (2022)

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Article Remote Sensing

Past, present and future of atomic clocks for GNSS

Bernardo Jaduszliwer et al.

Summary: GNSS relies on atomic clocks for timing precision and accuracy, significant investments have been made to improve technology and reduce errors, discussion on further optimizing atomic clock technology for enhanced GNSS performance and reliability.

GPS SOLUTIONS (2021)

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Article Engineering, Aerospace

Chip Scale Atomic Clock-Driven One-Way Radiometric Tracking for Low-Earth-Orbit CubeSat Navigation

Margaret M. Rybak et al.

Summary: The study explores the potential of using CSACs to provide CubeSat missions with precision timekeeping capabilities, reducing dependency on ground support. It presents methods for simulating and estimating CSAC signatures and temperature-induced frequency variations, analyzing navigation and clock estimation performance under different scenarios. The models and methods have the potential to be applied to other orbital regimes and CubeSat applications requiring precise onboard timing.

JOURNAL OF SPACECRAFT AND ROCKETS (2021)

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Article Physics, Multidisciplinary

Optimization of frequency shifts in optically detected magnetic-state-selection cesium beam atomic clocks

Shaohang Xu et al.

Summary: In this paper, a new method to suppress the AC Stark effect in compact cesium beam atomic clocks is proposed and experimentally verified. By introducing a detuned laser, the AC Stark effect can be strongly suppressed, leading to improved long-term frequency stability. These results have important implications for enhancing the performance of compact cesium beam atomic clocks.

EPL (2021)

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Article Instruments & Instrumentation

Improving the short-term frequency stability of a magnetic-state-selected cesium beam clock with optical detection

Chang Liu et al.

Summary: This paper analyzes the microwave spectrum line shape and signal-to-noise ratio of a compact optically detected magnetic-state-selection cesium beam clock. By optimizing locking parameters and microwave power, the clock achieves a signal-to-noise ratio of 7.0 x 10(3) in a bandwidth of 1 Hz, with a short-term stability of 4.1 x 10(-12) tau(-1/2) and a five-day Allan standard deviation of 7.7 x 10(-15).

REVIEW OF SCIENTIFIC INSTRUMENTS (2021)

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Review Quantum Science & Technology