Rapid generation of all-optical 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi mathvariant="normal">K</mml:mi><mml:mprescripts /><mml:none /><mml:mn>39</mml:mn></mml:mmultiscripts></mml:math>
 Bose-Einstein condensates using a low-field Feshbach resonance

Herbst, Alexander; Albers, H.; Stolzenberg, K.; Bode, S.; Schlippert, Dennis

doi:10.1103/physreva.106.043320

Cited by 3 publications

(2 citation statements)

References 68 publications

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“…4). A detailed description of the vacuum, laser, and coil systems used can be found in previous publications 8,10,74 . The ODT is based on a 1960 nm fiber laser [IPG TLR-50-1960-LP] which is intensity stabilized by a feedback loop, controlling a linearized Pockels cell.…”

Section: Experimental Apparatusmentioning

confidence: 99%

“…We apply a trap loading and state preparation sequence optimized for 39 K as described earlier 74 . We load a 3D-magneto-optical trap on the D 2 -line from a 2D-MOT, trapping 1 × 10 9 atoms within 4 s. Subsequently, we apply a hybrid D 1 -D 2 compression MOT to increase the ensemble's density and gray molasses cooling on the D 1 -line for cooling the ensemble to sub-Doppler temperatures 76 .…”

Section: Ensemble Preparationmentioning

confidence: 99%

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Matter-wave collimation to picokelvin energies with scattering length and potential shape control

Herbst,

Estrampes,

Albers

et al. 2024

Commun Phys

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The sensitivity of atom interferometers depends on their ability to realize long pulse separation times and prevent loss of contrast by limiting the expansion of the atomic ensemble within the interferometer beam through matter-wave collimation. Here we investigate the impact of atomic interactions on collimation by applying a lensing protocol to a 39K Bose-Einstein condensate at different scattering lengths. Tailoring interactions, we measure energies corresponding to (340 ± 12) pK in one direction. Our results are supported by an accurate simulation, which allows us to extrapolate a 2D ballistic expansion energy of (438 ± 77) pK. Based on our findings we propose an advanced scenario, which enables 3D expansion energies below 16 pK by implementing an additional pulsed delta-kick. Our results pave the way to realize ensembles with more than 1 × 105 atoms and 3D energies in the two-digit pK range in typical dipole trap setups without the need for micro-gravity or long baseline environments.

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Section: Experimental Apparatusmentioning

confidence: 99%

Section: Ensemble Preparationmentioning

confidence: 99%

Matter-wave collimation to picokelvin energies with scattering length and potential shape control

Herbst,

Estrampes,

Albers

et al. 2024

Commun Phys

Self Cite

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High-flux source system for matter-wave interferometry exploiting tunable interactions

Herbst,

Estrampes,

Albers

et al. 2024

Phys. Rev. Research

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Atom interferometers allow determining inertial effects to high accuracy. Quantum-projection noise as well as systematic effects impose demands on large atomic flux as well as ultralow expansion rates. Here we report on a high-flux source of ultracold atoms with free expansion rates near the Heisenberg limit directly upon release from the trap. Our results are achieved in a time-averaged optical dipole trap and enabled through dynamic tuning of the atomic scattering length across two orders of magnitude interaction strength via magnetic Feshbach resonances. We demonstrate Bose-Einstein condensates with more than 6×104 particles after evaporative cooling for 170 ms and their subsequent release with a minimal expansion energy of 4.5 nK in one direction. Based on our results we estimate the performance of an atom interferometer and compare our source system to a high performance chip trap, as readily available for ultraprecise measurements in microgravity environments. Published by the American Physical Society 2024

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Terrestrial very-long-baseline atom interferometry: Workshop summary

Abend,

Allard,

Alonso

et al. 2024

AVS Quantum Science

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This document presents a summary of the 2023 Terrestrial Very-Long-Baseline Atom Interferometry Workshop hosted by CERN. The workshop brought together experts from around the world to discuss the exciting developments in large-scale atom interferometer (AI) prototypes and their potential for detecting ultralight dark matter and gravitational waves. The primary objective of the workshop was to lay the groundwork for an international TVLBAI proto-collaboration. This collaboration aims to unite researchers from different institutions to strategize and secure funding for terrestrial large-scale AI projects. The ultimate goal is to create a roadmap detailing the design and technology choices for one or more kilometer--scale detectors, which will be operational in the mid-2030s. The key sections of this report present the physics case and technical challenges, together with a comprehensive overview of the discussions at the workshop together with the main conclusions.

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Rapid generation of all-optical K39 Bose-Einstein condensates using a low-field Feshbach resonance

Cited by 3 publications

References 68 publications

Matter-wave collimation to picokelvin energies with scattering length and potential shape control

Matter-wave collimation to picokelvin energies with scattering length and potential shape control

High-flux source system for matter-wave interferometry exploiting tunable interactions

Terrestrial very-long-baseline atom interferometry: Workshop summary

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