A trapped atom interferometer with ultracold Sr atoms
Xian Zhang, Ruben Pablo del Aguila, Tommaso Mazzoni, Nicola Poli, and, Guglielmo M. Tino
TL;DR
This paper demonstrates a trapped atom interferometer using ultracold Sr atoms with extended coherence times, enabling interference measurements up to 1 second and paving the way for high-precision quantum sensors.
Contribution
It introduces a novel trapped atom interferometer with ultracold Sr atoms combining Bragg diffraction and Bloch oscillations for extended coherence.
Findings
Interference observed up to 1 second in the lattice
Long coherence times achieved for Bloch oscillations
Decoherence sources during Bloch phase analyzed
Abstract
We report on a trapped atom interferometer based on Bragg diffraction and Bloch oscillations with alkaline-earth-metal atoms. We use a Ramsey-Bord\'e Bragg interferometer with Sr atoms combined with Bloch oscillations to extend the interferometer time. Thanks to a long coherence time for Bloch oscillations of Sr atoms, we observed interference up to 1 s evolution time in the lattice. A detailed study of decoherence sources during the Bloch phase is also presented. While still limited in sensitivity by lattice lifetime and beam inhomogeneity this result opens the way to high contrast trapped interferometers with extended interrogation time.
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