Coherent polarization self-rotation
- URL: http://arxiv.org/abs/2506.01892v1
- Date: Mon, 02 Jun 2025 17:18:48 GMT
- Title: Coherent polarization self-rotation
- Authors: Roy Shaham, Orr Meron, Or Katz, Dimitry Yankelev, Ofer Firstenberg,
- Abstract summary: coherent polarization self-rotation (CPSR) is a two-photon light-matter interaction in dense alkali-metal vapors.<n>CPSR enables narrowband optical spectroscopy of magnetic transitions and coherent coupling between light and atomic spins.
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- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: We introduce and study coherent polarization self-rotation (CPSR), a two-photon light-matter interaction in dense alkali-metal vapors that enables both narrowband optical spectroscopy of magnetic transitions and coherent coupling between light and collective atomic spins. Unlike conventional polarization self-rotation, CPSR requires initial spin polarization and a predominantly linearly polarized probe. It operates efficiently even in optically thick vapors with high buffer-gas pressure, rapid spin-exchange collisions, and optically-unresolved hyperfine structure. We demonstrate CPSR with near-unity contrast in rubidium and achieve an exceptionally narrow two-photon linewidth of 10 Hz in potassium. CPSR realizes a coherent interface between one optical quadrature and the long-lived collective electronic spin, offering a robust and scalable light-spin coupling in optically thick platforms. This opens new opportunities for quantum optics, including coherent transduction between light and ultra-long-lived noble-gas spins via alkali spins.
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