# Hypersonic Bose-Einstein Condensates in Accelerator Rings

## TL;DR

This paper demonstrates a novel method to transport Bose-Einstein condensates at hypersonic speeds in a magnetic guide, enabling highly sensitive, compact matterwave interferometers for advanced measurements.

## Contribution

It introduces a neutral-atom accelerator ring that transports BECs at hypersonic velocities with preserved coherence, advancing matterwave guide technology.

## Key findings

- Transported BECs over 15 cm in a magnetic guide at 16 times their sound velocity.
- Achieved high angular momentum, exceeding 40000h per atom, accessing higher Landau levels.
- Maintained internal coherence during high-speed transport, enabling new quantum regimes.

## Abstract

Some of the most sensitive and precise measurements to date are based on matterwave interferometry with freely falling atomic clouds. Examples include high-precision measurements of inertia, gravity and rotation. In order to achieve these very high sensitivities, the interrogation time has to be very long and consequently the experimental apparatus has to be very tall, in some cases reaching ten or even one hundred meters. Cancelling gravitational acceleration, e.g. in atomtronic circuits6,7 and matterwave guides, will result in compact devices having much extended interrogation times and thus much increased sensitivity both for fundamental and practical measurements. In this letter, we demonstrate extremely smooth and controllable matterwave guides by transporting Bose-Einstein condensates (BEC) over macroscopic distances: We use a novel neutral-atom accelerator ring to bring BECs to very high speeds (16x their velocity of sound) and transport them in a magnetic matterwave guide for 15 cm whilst fully preserving their internal coherence. The high angular momentum of more than 40000h per atom gives access to the higher Landau levels of quantum Hall states. The hypersonic velocities combined with our ability to control the potentials with pico-Kelvin precision open new perspectives in the study of superfluidity and give rise to new regimes of tunnelling and transport. Coherent matterwave guides are expected to enable interaction times of several seconds in highly compact devices. These developments will result in portable guided-atom interferometers for applications such as inertial navigation and gravity mapping.