Results 31 to 40 of about 6,623 (297)
This image is part of the Atomic Clock collection. The Atomic Clock collection is comprised of images documenting the development of the atomic clocks that were part of the National Bureau of Standards (NBS) Atomic Time System.
National Institute of Standards and Technology and Technology
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Reviews of Modern Physics, 2015 Optical atomic clocks represent the state-of-the-art in the frontier of modern measurement science. In this article we provide a detailed review on the development of optical atomic clocks that are based on trapped single ions and many neutral atoms. We discuss important technical ingredients for optical clocks, and we present measurement precision and
Ludlow, Andrew D. +4 more
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High resolution field imaging with atomic vapor cells [PDF]
, 2015 In this thesis, I report on the development of imaging techniques in atomic vapor cells. This is a relatively unexplored area, despite the ubiquitous use of imaging in experiments with ultracold atoms.
Horsley, Andrew
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Why do we need a Polish miniature time reference for space and military applications? [PDF]
Przegląd Komunikacyjny: The paper presents an overview of atomic clock solutions developed in leading scientific and commercial teams of the world. The construction of a Polish atomic clock is proposed, giving the names of scientific units that can participate in it ...
Paweł Knapkiewicz
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Evaluation of BDS-2 and BDS-3 Satellite Atomic Clock Products and Their Effects on Positioning
Remote Sensing, 2021 The BeiDou Navigation Satellite System (BDS) has completed third phase construction and currently provides global services, with a mixed constellation of BDS-2 and BDS-3. The newly launched BDS-3 satellites are equipped with rubidium and passive hydrogen
Shengfeng Gu +5 more
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A study of clock effects in Newton–Maxwell formalism
Geodesy and Geodynamics, 2020 Many measurements on the time gain/loss of the atomic clocks orbiting the spinning Earth have been done. The time gain/loss of the atomic clocks orbiting the spinning Earth is called gravitomagnetic clock effects.
Sankar Hajra
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Frontiers in Earth Science, 2023 Determination of the Earth’s gravity field and geopotential value is one of the fundamental topics in physical geodesy. Traditional terrestrial gravity and precise leveling measurements can be used to determine the geopotential values at a local or ...
Mohammad Bagherbandi +4 more
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Construction of optical system for an atomic clock-beyond atomic fountain
Frontiers in Physics, 2022 We demonstrate the construction of the optical system in the atomic clock-beyond atomic fountain based on 87Rb atom. The optical system includes a high-stability laser system and an optical lattice.
Xiumei Wang +21 more
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Stability of Atomic Clocks Based on Entangled Atoms [PDF]
Physical Review Letters, 2004 We analyze the effect of realistic noise sources for an atomic clock consisting of a local oscillator that is actively locked to a spin-squeezed (entangled) ensemble of $N$ atoms. We show that the use of entangled states can lead to an improvement of the long-term stability of the clock when the measurement is limited by decoherence associated with ...
Andre, A., Sorensen, A. S., Lukin, M. D.
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Frontiers in Physics, 2022 The research of optically pumped cesium beam atomic clock (OPCB) at Peking University has lasted for decades. At present, the short-term frequency stability is 3×10−12/τ and the long-term (5-day) frequency stability can reach 7 × 10−15.
Xuan He +6 more
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