Squeezing light with optomechanical and spin-light quantum interfaces

• URL: http://arxiv.org/abs/2504.03507v1
• Date: Fri, 04 Apr 2025 15:10:14 GMT
• Title: Squeezing light with optomechanical and spin-light quantum interfaces
• Authors: Gian-Luca Schmid, Manel Bosch Aguilera, Chun Tat Ngai, Maryse Ernzer, Luiz Couto Correa Pinto Filho, Dennis Høj, Ulrik Lund Andersen, Florian Goschin, Philipp Treutlein,
• Abstract summary: We exploit an ultracold atomic spin ensemble and a micromechanical membrane to generate polarization squeezing of light.<n>We obtain a maximal cooperativity of $C_mathrmqu =10$ for the spin and $C_mathrmqu = 9$ for the membrane.<n>Our results pave the way for hybrid quantum systems where spin and mechanical degrees of freedom are coherently coupled via light.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We investigate squeezing of light through quantum-noise-limited interactions with two different material systems: an ultracold atomic spin ensemble and a micromechanical membrane. Both systems feature a light-matter quantum interface that we exploit, respectively, to generate polarization squeezing of light through Faraday interaction with the collective atomic spin precession, and ponderomotive quadrature squeezing of light through radiation pressure interaction with the membrane vibrations in an optical cavity. Both experiments are described in a common theoretical framework, highlighting the conceptual similarities between them. The observation of squeezing certifies light-matter coupling with large quantum cooperativity, a prerequisite for applications in quantum science and technology. In our experiments, we obtain a maximal cooperativity of $C_\mathrm{qu} =10$ for the spin and $C_\mathrm{qu} = 9$ for the membrane. In particular, our results pave the way for hybrid quantum systems where spin and mechanical degrees of freedom are coherently coupled via light, enabling new protocols for quantum state transfer and entanglement generation over macroscopic distances.

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