scholarly journals Testing weakest force with coldest spot

2021 ◽  
Vol 81 (4) ◽  
Author(s):  
Rong-Gen Cai ◽  
Shao-Jiang Wang ◽  
Su Yi ◽  
Jiang-Hao Yu
Keyword(s):  
Occupation Number ◽  
Cold Atom ◽  
Frequency Measurement ◽  
Einstein Condensate ◽  
Newtonian Potential ◽  
Yukawa Interaction ◽  
Bose Einstein Condensate ◽  
Shape Oscillation ◽  
Bose Einstein ◽  
Newtonian Gravitational Constant

AbstractUltra-cold atom experiment in space with microgravity allows for realization of dilute atomic-gas Bose-Einstein condensate (BEC) with macroscopically large occupation number and significantly long condensate lifetime, which allows for a precise measurement on the shape oscillation frequency by calibrating itself over numerous oscillation periods. In this paper, we propose to measure the Newtonian gravitational constant via ultra-cold atom BEC with shape oscillation, although it is experimentally challenging. We also make a preliminary perspective on constraining the modified Newtonian potential such as the power-law potential, Yukawa interaction, and fat graviton. A resolution of frequency measurement of $$(1-100)\,\mathrm {nHz}$$ ( 1 - 100 ) nHz at most for the occupation number $$10^9$$ 10 9 , just one order above experimentally achievable number $$N\sim 10^6{-}10^8$$ N ∼ 10 6 - 10 8 , is feasible to constrain the modified Newtonian potential with Yukawa interaction greatly beyond the current exclusion limits.

scholarly journals Shape oscillation of a rotating Bose-Einstein condensate

2004 ◽  
Vol 65 (5) ◽  
pp. 594-600 ◽  
Author(s):  
S Stock ◽  
V Bretin ◽  
F Chevy ◽  
J Dalibard
Keyword(s):  
Einstein Condensate ◽  
Bose Einstein Condensate ◽  
Shape Oscillation ◽  
Bose Einstein

scholarly journals The Bose-Einstein Condensate and Cold Atom Laboratory

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
Kai Frye ◽  
Sven Abend ◽  
Wolfgang Bartosch ◽  
Ahmad Bawamia ◽  
Dennis Becker ◽  
...  
Keyword(s):  
Space Station ◽  
Cold Atom ◽  
Einstein Condensate ◽  
Atom Interferometry ◽  
Microgravity Environment ◽  
Atom Optics ◽  
Trapped Atoms ◽  
Bose Einstein Condensate ◽  
Bose Einstein ◽  
Coherent Manipulation

AbstractMicrogravity eases several constraints limiting experiments with ultracold and condensed atoms on ground. It enables extended times of flight without suspension and eliminates the gravitational sag for trapped atoms. These advantages motivated numerous initiatives to adapt and operate experimental setups on microgravity platforms. We describe the design of the payload, motivations for design choices, and capabilities of the Bose-Einstein Condensate and Cold Atom Laboratory (BECCAL), a NASA-DLR collaboration. BECCAL builds on the heritage of previous devices operated in microgravity, features rubidium and potassium, multiple options for magnetic and optical trapping, different methods for coherent manipulation, and will offer new perspectives for experiments on quantum optics, atom optics, and atom interferometry in the unique microgravity environment on board the International Space Station.

scholarly journals Casimir Force between Two Vortices in a Turbulent Bose–Einstein Condensate

Atoms ◽  
2020 ◽  
Vol 8 (4) ◽  
pp. 77
Author(s):  
José Tito Mendonça ◽  
Hugo Terças ◽  
João D. Rodrigues ◽  
Arnaldo Gammal
Keyword(s):  
Casimir Force ◽  
Occupation Number ◽  
Finite Size ◽  
Condensed Medium ◽  
Einstein Condensate ◽  
Density Fluctuations ◽  
Pitaevskii Equation ◽  
Phonon Modes ◽  
Bose Einstein Condensate ◽  
Bose Einstein

We consider the Casimir force between two vortices due to the presence of density fluctuations induced by turbulent modes in a Bose–Einstein condensate. We discuss the cases of unbounded and finite condensates. Turbulence is described as a superposition of elementary excitations (phonons or BdG modes) in the medium. Expressions for the Casimir force between two identical vortex lines are derived, assuming that the vortices behave as point particles. Our analytical model of the Casimir force is confirmed by numerical simulations of the Gross–Pitaevskii equation, where the finite size of the vortices is retained. Our results are valid in the mean-field description of the turbulent medium. However, the Casimir force due to quantum fluctuations can also be estimated, assuming the particular case where the occupation number of the phonon modes in the condensed medium is reduced to zero and only zero-point fluctuations remain.

scholarly journals A COLD-ATOM RATCHET INTERPOLATING BETWEEN CLASSICAL AND QUANTUM DYNAMICS

2013 ◽  
Vol 12 (02) ◽  
pp. 1340003 ◽  
Author(s):  
R. K. SHRESTHA ◽  
W. K. LAM ◽  
J. NI ◽  
G. S. SUMMY
Keyword(s):  
Classical Limit ◽  
Quantum Dynamics ◽  
Cold Atom ◽  
Einstein Condensate ◽  
Single Variable ◽  
Pulse Period ◽  
Short Pulses ◽  
Bose Einstein Condensate ◽  
Experimental Parameters ◽  
Bose Einstein

We use an atomic ratchet realized by applying short pulses of an optical standing-wave to a Bose–Einstein condensate to study the crossover between classical and quantum dynamics. The signature of the ratchet is the existence of a directed current of atoms, even though there is an absence of a net bias force. Provided that the pulse period is close to one of the resonances of the system, the ratchet behavior can be understood using a classical like theory which depends on a single variable containing many of the experimental parameters. Here we show that this theory is valid in both the true classical limit, when the pulse period is close to zero, as well as regimes when this period is close to other resonances where the usual scaled Planck's constant is nonzero. By smoothly changing the pulse period between these resonances we demonstrate how it is possible to tune the ratchet between quantum and classical types of behavior.

scholarly journals Cold-atom gravimetry with a Bose-Einstein condensate

2011 ◽  
Vol 84 (3) ◽  
Author(s):  
J. E. Debs ◽  
P. A. Altin ◽  
T. H. Barter ◽  
D. Döring ◽  
G. R. Dennis ◽  
...  
Keyword(s):  
Cold Atom ◽  
Einstein Condensate ◽  
Bose Einstein Condensate ◽  
Bose Einstein

scholarly journals Shell potentials for microgravity Bose–Einstein condensates

2019 ◽  
Vol 5 (1) ◽  
Author(s):  
N. Lundblad ◽  
R. A. Carollo ◽  
C. Lannert ◽  
M. J. Gold ◽  
X. Jiang ◽  
...  
Keyword(s):  
Space Station ◽  
Cold Atom ◽  
Einstein Condensate ◽  
Quantum Gas ◽  
Ellipsoidal Shell ◽  
Magnetically Trapped ◽  
Bose Einstein Condensate ◽  
Bose Einstein ◽  
Shell Geometry ◽  
Insight Into

AbstractExtending the understanding of Bose–Einstein condensate (BEC) physics to new geometries and topologies has a long and varied history in ultracold atomic physics. One such new geometry is that of a bubble, where a condensate would be confined to the surface of an ellipsoidal shell. Study of this geometry would give insight into new collective modes, self-interference effects, topology-dependent vortex behavior, dimensionality crossovers from thick to thin shells, and the properties of condensates pushed into the ultradilute limit. Here we propose to implement a realistic experimental framework for generating shell-geometry BEC using radiofrequency dressing of magnetically trapped samples. Such a tantalizing state of matter is inaccessible terrestrially due to the distorting effect of gravity on experimentally feasible shell potentials. The debut of an orbital BEC machine (NASA Cold Atom Laboratory, aboard the International Space Station) has enabled the operation of quantum-gas experiments in a regime of perpetual freefall, and thus has permitted the planning of microgravity shell-geometry BEC experiments. We discuss specific experimental configurations, applicable inhomogeneities and other experimental challenges, and outline potential experiments.

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