Spin-squeezing swapping for differential measurements with atom interferometers and clocks

• URL: http://arxiv.org/abs/2205.09698v1
• Date: Thu, 19 May 2022 17:06:17 GMT
• Title: Spin-squeezing swapping for differential measurements with atom interferometers and clocks
• Authors: Robin Corgier and Marco Malitesta and Augusto Smerzi and Luca Pezz\`e
• Abstract summary: Differential interferometry can be understood as a distributed multisqueeze estimation problem. We propose to overcome the standard quantum limit by exploiting spin-squeezing in an atomic quantum network. The scheme is also tested with simulation of noise in atomic clocks and interferometers.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Thanks to common-mode noise rejection, differential configurations are crucial for realistic applications of phase and frequency estimation with atom interferometers. Differential interferometry can be understood as a distributed multiparameter estimation problem and can benefit from both mode and particle entanglement. Currently, differential protocols with uncorrelated particles and mode-separable settings reach a sensitivity bounded by the standard quantum limit (SQL). Here, we propose to overcome the SQL by exploiting spin-squeezing in an atomic quantum network. A single spin-squeezed state 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.

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