2022/01/28 by Hyosub Kim, Katarzyna Krzyżanowska, Kim, Hyosub +9 · 1 citation
Physics and Astronomy · #Cold Atom Physics and Bose-Einstein Condensates #Atomic and Subatomic Physics Research #Advanced Frequency and Time Standards
paper · pdf · doi:10.48550/arxiv.2201.11888
We report a multiple-loop guided atom interferometer in which the atoms make 200 small-amplitude roundtrips, instead of one large single orbit. The approach is enabled by using ultracold 39K gas and a magnetic Feshbach resonance that can tune the s-wave scattering length across zero to significantly reduce the atom loss from cold collisions. This scheme is resilient against noisy environments, achieving 0.9 s interrogation time without any vibration noise isolation or cancellation. A form of quantum lock-in amplification can be used with the device to measure localized potentials with high sensitivity. We used this technique to measure the dynamic polarizability of the 39K ground state at 1064 nm. The interferometer may also be a useful approach to building a compact multiple-loop Sagnac atom interferometer for rotation sensing.