Interacting quantum mixtures for precision atom interferometry

Abstract

We present a source engineering concept for a binary quantum mixture suitable as input for differential, precision atom interferometry with drift times of several seconds. To solve the non-linear dynamics of the mixture, we develop a set of scaling approach equations and verify their validity contrasting it to the one of a system of coupled Gross–Pitaevskii equations. This scaling approach is a generalization of the standard approach commonly used for single species. Its validity range is discussed with respect to intra- and inter-species interaction regimes. We propose a multi-stage, non-linear atomic lens sequence to simultaneously create dual ensembles with ultra-slow kinetic expansion energies, below 15 pK. Our scheme has the advantage of mitigating wave front aberrations, a leading systematic effect in precision atom interferometry.

Collective-Mode Enhanced Matter-Wave Optics

“…Obviously, our method can also be employed with attractive or tunable interactions [40] and diverging magnetic lenses [41,42]. Interactions are nowadays also exploited to establish non-classical correlations.…”

Inertial sensing with quantum gases: a comparative performance study of condensed versus thermal sources for atom interferometry

“…Small-scale distortions (few μm) of the optical beams [76], not considered in this article, can hint to a disadvantage for the BEC samples by means of averaging effects for WFA. However, the flexibility in tuning their initial size [75] mitigates this effect and could bring them to starting sizes similar to thermal ensembles if necessary. This engineering of the BEC size allows for a distinct analysis of WFA with long and short periodicity [5,44].…”

“…As for the spacegradiometer, this is unpractical for manipulation and excitation reasons: The required beam quality in terms of WFA over several decimeters in diameter and high laser power to achieve reasonable excitation rates pose a considerable technical challenge. In the condensed regime, a simultaneous collimation of the dual-source was recently considered in reference [75] and shown to be feasible.…”

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

“…In such a configuration, the determination of the optimal holding time will benefit from the in-phase oscillations of the atomic ensemble's size [67]. When applying our matter-wave lens in a dual-species experiment, isotropy of the trap will also improve the miscibility of the two ensembles [68]. To illustrate the relevance for atom interferometers, we discuss the impact of our source in different regimes (details in the "Methods" section) at the SQL for an acceleration measurement.…”