Scalable spin squeezing in a dipolar Rydberg atom array

• URL: http://arxiv.org/abs/2303.08053v2
• Date: Fri, 8 Sep 2023 17:18:18 GMT
• Title: Scalable spin squeezing in a dipolar Rydberg atom array
• Authors: Guillaume Bornet, Gabriel Emperauger, Cheng Chen, Bingtian Ye, Maxwell Block, Marcus Bintz, Jamie A. Boyd, Daniel Barredo, Tommaso Comparin, Fabio Mezzacapo, Tommaso Roscilde, Thierry Lahaye, Norman Y. Yao, Antoine Browaeys
• Abstract summary: We show how to enhance the precision of measurements beyond the standard quantum limit. To do so, one can reshape the quantum projection noise -- a strategy known as squeezing. We present two independent refinements: first, using a multistep spin-squeezing protocol allows us to further enhance the squeezing by approximately 1 dB, and second, leveraging Floquet engineering to realize Heisenberg interactions.
• Score: 2.392520546501394
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: The standard quantum limit bounds the precision of measurements that can be achieved by ensembles of uncorrelated particles. Fundamentally, this limit arises from the non-commuting nature of quantum mechanics, leading to the presence of fluctuations often referred to as quantum projection noise. Quantum metrology relies on the use of non-classical states of many-body systems in order to enhance the precision of measurements beyond the standard quantum limit. To do so, one can reshape the quantum projection noise -- a strategy known as squeezing. In the context of many-body spin systems, one typically utilizes all-to-all interactions (e.g. the one-axis twisting model) between the constituents to generate the structured entanglement characteristic of spin squeezing. Motivated by recent theoretical work, here we explore the prediction that short-range interactions -- and in particular, the two-dimensional dipolar XY model -- can also enable the realization of scalable spin squeezing. Working with a dipolar Rydberg quantum simulator of up to 100 atoms, we demonstrate that quench dynamics from a polarized initial state lead to spin squeezing that improves with increasing system size up to a maximum of -3.5 dB (prior to correcting for detection errors, or approximately -5 dB after correction). Finally, we present two independent refinements: first, using a multistep spin-squeezing protocol allows us to further enhance the squeezing by approximately 1 dB, and second, leveraging Floquet engineering to realize Heisenberg interactions, we demonstrate the ability to extend the lifetime of the squeezed state by freezing its dynamics.

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