Quantum-enhanced differential atom interferometers and clocks with spin-squeezing swapping

Year: 2023

Authors: Corgier R., Malitesta M., Smerzi A., Pezzè L.

Autors Affiliation: QSTAR, INO CNR, Largo Enrico Fermi 2, I-50125 Florence, Italy; LENS, Largo Enrico Fermi 2, I-50125 Florence, Italy; Univ PSL, Sorbonne Univ, LNE SYRTE, Observ Paris,CNRS, 61 Ave Observ, F-75014 Paris, France.

Abstract: Thanks to common-mode noise rejection, dif-ferential configurations are crucial for realistic applications of phase and frequency estimation with atom interferometers. Current differential protocols with uncorrelated particles and mode -separable settings reach a sensitivity bounded by the standard quantum limit (SQL). Here we show that differential interferometry can be un-derstood as a distributed multiparameter es-timation problem and can benefit from both mode and particle entanglement. Our protocol uses a single spin-squeezed state that is mode -swapped among common interferometric modes. The mode swapping is optimized to estimate the differential phase shift with sub-SQL sensitivity. Numerical calculations are supported by analyt-ical approximations that guide the optimization of the protocol. The scheme is also tested with simulation of noise in atomic clocks and interfer-ometers.

Journal/Review: QUANTUM

Volume: 7      Pages from: arXiv:2205.0969  to: arXiv:2205.0969

More Information: R.C. thanks the Paris Observatory Scientific Council and was funded by PSL fellowship at Paris Observatory program. We acknowledge financial support from the QuantEra project SQUEIS. We also acknowledge financial support from the European Union’s Horizon 2020 research and innovation programme-Qombs Project, FET Flagship on Quantum Technologies Grant No. 820419.
KeyWords: Podolsky-rosen Paradox; Entanglement; Sensors; Limit
DOI: 10.22331/Q-2023-03-30-965

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