Strong spin squeezing induced by weak squeezing of light inside a cavity

Wei Qin, Ye-Hong Chen, Xin Wang, Adam Miranowicz, Franco Nori

doi:10.1515/nanoph-2020-0513

<jats:title>Abstract</jats:title> <jats:p>We propose a simple method for generating spin squeezing of atomic ensembles in a Floquet cavity subject to a weak, detuned two-photon driving. We demonstrate that <jats:italic>the weak squeezing of light inside the cavity can, counterintuitively, induce strong spin squeezing</jats:italic>. This is achieved by exploiting the anti-Stokes scattering process of a photon pair interacting with an atom. Specifically, <jats:italic>one photon of the photon pair is scattered into the cavity resonance by absorbing partially the energy of the other photon whose remaining energy excites the atom</jats:italic>. The scattering, combined with a Floquet sideband, provides an alternative mechanism to implement Heisenberg-limited spin squeezing. Our proposal does <jats:italic>not</jats:italic> need multiple classical and cavity-photon drivings applied to atoms in ensembles, and therefore its experimental feasibility is greatly improved compared to other cavity-based schemes. As an example, we demonstrate a possible implementation with a superconducting resonator coupled to a nitrogen-vacancy electronic-spin ensemble.</jats:p>

Strong spin squeezing induced by weak squeezing of light inside a cavity

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Strong spin squeezing induced by weak squeezing of light inside a cavity

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