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  • Letter
  • Open Access

Enhancing spin squeezing using soft-core interactions

Jeremy T. Young1,2,*, Sean R. Muleady1,2, Michael A. Perlin1,2, Adam M. Kaufman1, and Ana Maria Rey1,2

  • 1JILA, University of Colorado and National Institute of Standards and Technology, and Department of Physics, University of Colorado, Boulder, Colorado 80309, USA
  • 2Center for Theory of Quantum Matter, University of Colorado, Boulder, Colorado 80309, USA

  • *Corresponding author: jeremy.young@colorado.edu
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Phys. Rev. Research 5, L012033 – Published 10 March, 2023

DOI: https://doi.org/10.1103/PhysRevResearch.5.L012033

Abstract

We propose a protocol for preparing spin squeezed states in controllable atomic, molecular, and optical systems, with particular relevance to emerging optical clock platforms compatible with Rydberg interactions. By combining a short-range, soft-core potential with an external drive, we can transform naturally emerging Ising interactions into an XX spin model while opening a many-body gap. The gap helps maintain the system within a collective manifold of states where metrologically useful spin squeezing can be generated. We examine the robustness of our protocol to experimentally relevant decoherence and show favorable performance over typical protocols lacking gap protection. For example, in a 14×14 system, we observe that soft-core interactions can generate spin squeezing comparable to an all-to-all Ising model even in the presence of relevant decoherence, the same amount of squeezing as the decoherence-free XX spin model with 1/r3 dipolar interactions, and a 5.8 dB gain over the decoherence-free XX spin model with 1/r6 interactions.

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Phys. Rev. Research 5, L012033– Published 10 March, 2023
  • Received 25 August 2022
  • Revised 8 December 2022
  • Accepted 8 February 2023
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