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Atom interferometers allow determining inertial effects to high accuracy.Quantum-projection noise as well as systematic effects impose demands on largeatomic flux as well as ultra-low expansion rates. Here we report on a high-fluxsource of ultra-cold atoms with free expansion rates near the Heisenberg limitdirectly upon release from the trap. Our results are achieved in atime-averaged optical dipole trap and enabled through dynamic tuning of theatomic scattering length across two orders of magnitude interaction strengthvia magnetic Feshbach resonances. We demonstrate BECs with more than $6\times10^{4}$ particles after evaporative cooling for $170$ ms and their subsequentrelease with a minimal expansion energy of $4.5$ nK in one direction. Based onour results we estimate the performance of an atom interferometer and compareour source system to a high performance chip-trap, as readily available forultra-precise measurements in micro-gravity environments.

A high-flux source system for matter-wave interferometry exploiting tunable interactions