Quantum-enhanced differential atom interferometers and clocks with spin-squeezing swapping
1QSTAR, INO-CNR and LENS, Largo Enrico Fermi 2, 50125 Firenze, Italy.
2LNE-SYRTE, Observatoire de Paris, Université PSL, CNRS, Sorbonne Université 61 avenue de l’Observatoire, 75014 Paris, France
Published: | 2023-03-30, volume 7, page 965 |
Eprint: | arXiv:2205.09698v3 |
Doi: | https://doi.org/10.22331/q-2023-03-30-965 |
Citation: | Quantum 7, 965 (2023). |
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Abstract
Thanks to common-mode noise rejection, differential configurations are crucial for realistic applications of phase and frequency estimation with atom interferometers. Currently, 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 understood as a distributed multiparameter estimation 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 analytical approximations that guide the optimization of the protocol. The scheme is also tested with simulation of noise in atomic clocks and interferometers.
![](https://quantum-journal.org/wp-content/uploads/2023/03/Diapositive1.png)
Popular summary
Currently, 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 understood as a distributed multiparameter estimation 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.
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