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High-flux source system for matter-wave interferometry exploiting tunable interactions
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DOI：10.1103/PhysRevResearch.6.013139.png)
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Abstract
En 中文
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 6x104 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.
Keywords:
BOSE-EINSTEIN CONDENSATION
FESHBACH RESONANCES
ELASTIC-SCATTERING
SPACE
CONSTANT
ATOM
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