Effective self-similar expansion of a Bose-Einstein condensate: Free space versus confined geometries

Viedma, David; Modugno, Michèle

doi:10.1103/physrevresearch.2.033478

“…and R i (0) is the initial Thomas-Fermi radius of the BEC along the i-th direction. It is worth to notice that recent studies 86,87 extend the analysis of Guéry-Odelin 83 and Pedri et al 84 to the BEC regime described by Castin & Dum 85 . With this set of equations the time evolution of the ensemble's size (σ r i ) and velocity distribution (σ v i ) is determined during the entire sequence of our matterwave lensing sequence by Source parameters for the instability estimation for molasses cooled, released from the optical dipole trap (ODT) with and without evaporation, and Bose-Einstein condensates (BEC and Advanced).…”

Section: Methodsmentioning

confidence: 66%

“…Evaporative cooling. We operate a crossed optical dipole trap at a wavelength of 1960 nm loaded from a 87 Rb magneto-optical trap (details in the "Methods" section). The time-averaged potentials are generated by simultaneuos center-position modulation of the crossed laser beams in the horizontal plane.…”

Section: Resultsmentioning

confidence: 99%

All-Optical Matter-Wave Lens using Time-Averaged Potentials

Schlippert¹,

Albers²,

Herbst³

et al. 2022

Preprint

0

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The precision of matter-wave sensors benefits from interrogating large-particle-number atomic ensembles at high cycle rates. Quantum-degenerate gases with their low effective temperatures allow for constraining systematic errors towards highest accuracy, but their production by evaporative cooling is costly with regard to both atom number and cycle rate. In this work, we report on the creation of cold matter-waves using a crossed optical dipole trap and shaping them by means of an all-optical matter-wave lens. We demonstrate the trade off between lowering the residual kinetic energy and increasing the atom number by reducing the duration of evaporative cooling and estimate the corresponding performance gain in matter-wave sensors. Our method is implemented using time-averaged optical potentials and hence easily applicable in optical dipole trapping setups.

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“…These results can be easily generalized to the 3D case in different interaction regimes, see Ref. [18].…”

Section: Discussionmentioning

confidence: 78%

“…[16,17]. Remarkably, it turns out that the spaceaveraged self-similarity can provide an accurate description in several situations [18].…”

Section: Introductionmentioning

confidence: 99%

Effective Scaling Approach to Frictionless Quantum Quenches in Trapped Bose Gases

Huang,

Modugno,

Chen

2021

Preprint

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We work out the effective scaling approach to frictionless quantum quenches in a one-dimensional Bose gas trapped in a harmonic trap. The effective scaling approach produces an auxiliary equation for the scaling parameter interpolating between the noninteracting and the Thomas-Fermi limits. This allows us to implement a frictionless quench by engineering inversely the smooth trap frequency, as compared to the two-jump trajectory. Our result is beneficial to design the shortcut-to-adiabaticity expansion of trapped Bose gases for arbitrary values of interaction, and can be directly extended to the three-dimensional case.

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All-optical matter-wave lens using time-averaged potentials

Albers

¹

,

Corgier

²

,

Herbst

³

et al. 2022

Commun Phys

8

0

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The precision of matter-wave sensors benefits from interrogating large-particle-number atomic ensembles at high cycle rates. Quantum-degenerate gases with their low effective temperatures allow for constraining systematic errors towards highest accuracy, but their production by evaporative cooling is costly with regard to both atom number and cycle rate. In this work, we report on the creation of cold matter-waves using a crossed optical dipole trap and shaping them by means of an all-optical matter-wave lens. We demonstrate the trade off between lowering the residual kinetic energy and increasing the atom number by reducing the duration of evaporative cooling and estimate the corresponding performance gain in matter-wave sensors. Our method is implemented using time-averaged optical potentials and hence easily applicable in optical dipole trapping setups.

show abstract

Effective self-similar expansion of a Bose-Einstein condensate: Free space versus confined geometries

Cited by 6 publications

References 26 publications

All-Optical Matter-Wave Lens using Time-Averaged Potentials

All-Optical Matter-Wave Lens using Time-Averaged Potentials

Effective Scaling Approach to Frictionless Quantum Quenches in Trapped Bose Gases

All-optical matter-wave lens using time-averaged potentials

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