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arXiv · 2207.02169

Proposal for spin squeezing in rare-earth ion-doped crystals with a four-color scheme

Tamás Kriváchy·Krzysztof T. Kaczmarek·Mikael Afzelius·Jean Etesse·Géraldine Haack
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Abstract

Achieving spin squeezing within solid-state devices is a long standing research goal, due to the promise of their particularities, for instance their long coherence times, the possibility of low-temperature experiments or integration of entanglement-assisted sensors on-chip. In this work, we investigate an interferometer-free four-color scheme to achieve spin squeezing of rare-earth ion-doped crystals. The proposal relies on an analytic derivation that starts from a Tavis-Cummings model for light-matter interaction, providing microscopic insights onto spin-squeezing generation. We evidence spin squeezing signature in the light intensity variance. We consider the two particular cases of europium- and praseodymium-doped yttrium orthosilicates, workhorses of quantum technology developments. We show that up to 8 dB of spin squeezing can be obtained with readily accessible experimental resources, including noise due to photon scattering. Our results for rare-earth ion-doped crystals add to promising properties of these platforms for manipulating many-body entangled states and for high-precision measurements.

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Tamás Kriváchy, Krzysztof T. Kaczmarek, Mikael Afzelius, Jean Etesse, Géraldine Haack. 2022-07-05. Proposal for spin squeezing in rare-earth ion-doped crystals with a four-color scheme. https://doi.org/10.1103/physreva.107.013108

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