An entanglement-enhanced atomic gravimeter

TL;DR

This paper demonstrates a gravimeter using Bose-Einstein condensates that surpasses the standard quantum limit, enhancing measurement precision through entanglement and advanced atom manipulation techniques.

Contribution

It introduces a novel entanglement-enhanced atomic gravimeter utilizing Bose-Einstein condensates with improved sensitivity and scalability over previous methods.

Findings

Achieved -1.7 dB sensitivity beyond the standard quantum limit.

Used delta-kick collimation to minimize atom loss.

Enhanced scalability for very-long baseline atom interferometers.

Abstract

Interferometers based on ultra-cold atoms enable an absolute measurement of inertial forces with unprecedented precision. However, their resolution is fundamentally restricted by quantum fluctuations. Improved resolutions with entangled or squeezed atoms were demonstrated in internal-state measurements for thermal and quantum-degenerate atoms and, recently, for momentum-state interferometers with laser-cooled atoms. Here, we present a gravimeter based on Bose-Einstein condensates with a sensitivity of $-1.7^{+0.4}_{-0.5}\,$dB beyond the standard quantum limit. Interferometry with Bose-Einstein condensates combined with delta-kick collimation minimizes atom loss in and improves scalability of the interferometer to very-long baseline atom interferometers.