The emergence of picokelvin physics

Chen, Xuzong; Fan, Bo

doi:10.1088/1361-6633/ab8ab6

Cited by 11 publications

(6 citation statements)

References 138 publications

(360 reference statements)

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“…In orbital microgravity, however, the temperature drops to 3.3 ± 0.5 μK, significantly lower than the on-ground value in the same experimental setting. As discussed earlier, this observation demonstrates the influence of gravity on the PGC process and indicates that the microgravity environment is an attractive and suitable place for studying cold atom physics [ 35 ]. Further experiments indicated that the temperature remained reasonably consistent during long-term operation, as shown in Fig.…”

Section: Resultsmentioning

confidence: 61%

“…A cold atom interferometer operating in microgravity was also demonstrated in a parabolic flight [ 33 ]. In particular, the observation of a BEC in the International Space Station has been reported [ 34 ], and intense on-going efforts have been devoted to sub-nanokelvin physics in the space lab [ 35 ]. Moreover, the cold atom platform in space is believed to have great potential for applications for quantum sensing and fundamental physics, and several promising proposals have been suggested, including the detection of gravitational waves and search for dark matter [ 36 , 37 ].…”

Section: Introductionmentioning

confidence: 99%

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Characterization of laser cooling in microgravity via long-term operations in TianGong-2 space lab

Lü

Ren

Sun

et al. 2022

National Science Review

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The invention of laser cooling has fundamentally influenced the research frontier of atomic physics and quantum physics, and recently an intense focus has been on the studies of cold atom physics in microgravity environments. Herein, we report the results of our laser cooling experiment in TianGong-2 Space Lab, which was conducted for 34 consecutive months in orbit. Over such an extended operation time, the quality of laser cooling did not experience any significant decline, while the properties of laser cooling in orbital microgravity were systematically studied. In particular, we demonstrate magneto-optical trapping and polarization gradient cooling in orbit and carefully examine their performances. A comparison of the in-orbit and on-ground results indicates that a higher cooling efficiency exists in microgravity, including a smaller loss rate during the trapping and cooling process and lower ultimate temperature of laser-cooled atoms. Our progress has laid the technical foundations for future applications of cold atoms in space missions with operation times in the order of years.

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Section: Resultsmentioning

confidence: 61%

Section: Introductionmentioning

confidence: 99%

Characterization of laser cooling in microgravity via long-term operations in TianGong-2 space lab

Lü

Ren

Sun

et al. 2022

National Science Review

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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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“…China is scheduled to launch the space station experimental module by the end of 2022, which will be equipped with a Cold Atom Physics Rack (CAPR). The atomic deep cooling adopts the two-stage cooling (TSC) scheme proposed by Peking University [24][25][26][27]. In the first stage, atoms undergo the runaway evaporation cooling process in an optical trap formed by two crossed laser beams with narrow beam diameter and high power.…”

Section: Introductionmentioning

confidence: 99%

Deep cooling scheme of quantum degenerate gas and ground experimental verification for chinese space station

Yuan

et al. 2022

Front. Phys.

Self Cite

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The Cold Atom Physics Rack (CAPR) of Chinese space station will be launched at the end of 2022. The important goal of CAPR is to achieve BEC at 100 pk. In order to obtain ultracold atoms in microgravity of space station, we propose a two-stage cooling scheme using all-optical trap with different waist beams. The cold atom cloud obtained by this scheme is composed of condensate and thermal atoms around condensate. The design of our two-stage cooling scheme will effectively reduce the temperature of the thermal atom cloud and the effective temperature generated by the interaction energy of the condensate. The atomic temperature of 5 nk is obtained from the ground test experiment, and the corresponding temperature under the microgravity condition of the space station is theoretically predicted to be less than 100 pk. Taking the advantages of ultracold temperature and long-time detection, many scientific experiments will be arranged. In this paper, the ground test experiments based on ground principle prototype and pre-prototype for CAPR are also introduced.

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The emergence of picokelvin physics

Cited by 11 publications

References 138 publications

Characterization of laser cooling in microgravity via long-term operations in TianGong-2 space lab

Characterization of laser cooling in microgravity via long-term operations in TianGong-2 space lab

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

Deep cooling scheme of quantum degenerate gas and ground experimental verification for chinese space station

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