Development of a space cold atom clock

Ren, Wei; Li, Tang; Qu, Qiuzhi; Wang, Bin; Lü, Lin; Lü, Desheng; Chen, Weibiao; Liu, Liang

doi:10.1093/nsr/nwaa215

Cited by 20 publications

(8 citation statements)

References 32 publications

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“…The system was launched into space aboard the Chinese space laboratory Tiangong-2 in September 2016. It has proven long-term in-orbit operation of cold-atom clocks under various environmental effects such as varying gravity levels, magnetic fields and radiation [633,634].…”

Section: Scientific Experimentsmentioning

confidence: 99%

Quantum Physics in Space

Belenchia,

Carlesso,

Bayraktar

et al. 2021

Preprint

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Advances in quantum technologies are giving rise to a revolution in the way fundamental physics questions are explored at the empirical level. At the same time, they are the seeds for future disruptive technological applications of quantum physics. Remarkably, a space-based environment may open many new avenues for exploring and employing quantum physics and technologies. Recently, space missions employing quantum technologies for fundamental or applied studies have been proposed and implemented with stunning results.The combination of quantum physics and its space application is the focus of this review: we cover both the fundamental scientific questions that can be tackled with quantum technologies in space and the possible implementation of these technologies for a variety of academic and commercial purposes.

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Section: Scientific Experimentsmentioning

confidence: 99%

Quantum Physics in Space

Belenchia,

Carlesso,

Bayraktar

et al. 2021

Preprint

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“…The development of ultracold-atom physics as platforms for chip-based matter wave manipulation [1], high-accuracy time keeping systems [2,3], quantum computing and simulation [4][5][6][7] is an active research field. Understanding atom-surface interactions is essential for achieving near-surface atom trapping, as required for the operation of micro-fabricated atom chips.…”

Section: Introductionmentioning

confidence: 99%

Casimir-Polder interactions of Rydberg atoms with graphene-based van der Waals heterostructures

Wongcharoenbhorn¹,

Koller²,

Fromhold³

et al. 2022

Preprint

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We investigate the thermal Casimir-Polder (CP) potential of 87 Rb atoms in Rydberg nS-states near single-and double-layer graphene. The dependence of the CP potential on parameters such as atom-surface distance, temperature, principal quantum number n and graphene Fermi energy are explored. Through large scale numerical simulations, we show that, in the non-retarded regime, the CP potential is dominated by the non-resonant and evanescent-wave terms which are monotonic, and that, in the retarded regime, the CP potential exhibits spatial oscillations. We identify that the most important contributions to the resonant component of the CP potential come from the nS-nP and nS-(n − 1)P transitions. Scaling of the CP potential as a function of the principal quantum number and temperature is obtained. A heterostructure comprising hexagonal boron nitride layers sandwiched between two graphene layers is also studied. When the boron nitride layer is sufficiently thin, the CP potential can be weakened by changing the Fermi energy of the top graphene layer.Our study provides insights for understanding and controlling CP potentials experienced by Rydberg atoms near single and multi-layer graphene-based van der Waals heterostructures.

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“…In fact, the researchers of Humboldt University built an ultra-high sensitivity gravimeter in 2013 whose sensitivity of the gravimeter sensor is reached [ 27 ]. Otherwise, various ICT devices such as satellite, GPS and quantum computers are based on oscillation clocks that should have a stable frequency to achieve high performances in their functions [ 28 , 29 ]. For this purpose, the quartz clocks based on quartz oscillation have been replaced by atomic clocks to improve the efficiency and the performance of ICT devices [ 30 ].…”

Section: Introductionmentioning

confidence: 99%

“…For this purpose, the quartz clocks based on quartz oscillation have been replaced by atomic clocks to improve the efficiency and the performance of ICT devices [ 30 ]. Indeed, the time counter in atomic clocks is achieved by exploiting the energy difference between two stationary quantum states in an ultra-cold atom Rubidium or Cesium [ 28 , 31 ]. Recently, the Deep Space Atomic Clock (DSAC) engineered on June 24, 2019 at the Kennedy Space Center in Florida has a high accuracy with an uncertainty of less than 10 ns every 10 days, which is equivalent to one second in each 10 million years [ 32 ].…”

Section: Introductionmentioning

confidence: 99%

Analytical and numerical study of diffusion and localization of cold atoms in 3D optical speckles

2022

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This paper aims to study the diffusion and localization of cold atoms in three-dimensional (3D) optical speckles by using the theory of self-energy for N diffusers. In this paper, the Self-consistent Born approximation (SCBA) is used to study the diffusion and localization of cold atoms in an optical disordered speckles, while the spectral function is adopted to study the effect of the matter waves energy and the disorder amplitude on the behaviour of cold atoms. For this purpose, the models of SCBA and spectral function are computed by a numerical algorithm. The calculation of the latter quantity involves the application of Simpson’s integration methods. The diffusion and localization of a Bose–Einstein Condensate for First-order Born Approximation (FBA) and SCBA models are presented. In addition, the diffusion time and the mean free path between two diffusers are illustrated. Moreover, the effect of disorder amplitude and the scattering of matter waves in 3D disordered potentials are highlighted. In this study, the results show that the time response of cold atoms localization and metal–insulator transition in SCBA is faster and yields lower energy than the FBA approximation.

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Development of a space cold atom clock

Cited by 20 publications

References 32 publications

Quantum Physics in Space

Quantum Physics in Space

Casimir-Polder interactions of Rydberg atoms with graphene-based van der Waals heterostructures

Analytical and numerical study of diffusion and localization of cold atoms in 3D optical speckles

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