Suppression of Coriolis error in weak equivalence principle test using ^[85]Rb-^[87]Rb dual-species atom interferometer

TL;DR

This paper addresses the Coriolis error in weak equivalence principle tests using a dual-species atom interferometer by both theoretical modeling and experimental techniques, achieving significant error suppression.

Contribution

It introduces a combined theoretical and experimental approach to suppress Coriolis errors in atom interferometry WEP tests, including optimizing atomic cloud positioning and rotation compensation.

Findings

Coriolis error reduced to 1.1E-9 through experimental optimization.

Total uncertainty of eta measurement decreased to 4.4E-11.

Effective suppression of Coriolis error enhances WEP test accuracy.

Abstract

Coriolis effect is an important error source in the weak equivalence principle (WEP) test using atom interferometer. In this paper, the problem of Coriolis error in WEP test is studied theoretically and experimentally. In theoretical simulation, Coriolis effect is analyzed by establishing an error model. The measurement errors of Eotvos coefficient (eta) in WEP test related to experimental parameters, such as horizontal-velocity difference and horizontal-position difference of atomic clouds, horizontal-position difference of detectors and rotation compensation of Raman laser's mirror are calculated. In experimental investigation, the position difference between Rb-85 and Rb-87 atomic clouds is reduced to 0.1 mm by optimizing the experimental parameters, an alternating detection method is used to suppress the error caused by detection position difference, thus the Coriolis error related to atomic clouds and detectors is eliminated to 1.1E-9. This Coriolis error is further corrected by compensating the rotation of Raman laser's mirror, and the total uncertainty of eta measurement related to Coriolis effect is reduced as 4.4E-11.