Coupling light to a nuclear spin gas with a two-photon linewidth of five millihertz

• URL: http://arxiv.org/abs/2102.00229v1
• Date: Sat, 30 Jan 2021 13:57:17 GMT
• Title: Coupling light to a nuclear spin gas with a two-photon linewidth of five millihertz
• Authors: Or Katz, Roy Shaham, Ofer Firstenberg
• Abstract summary: Nuclear spins of noble gases feature extremely long coherence times but are inaccessible to optical photons. Here we realize a coherent interface between light and noble-gas spins that is mediated by alkali atoms.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Nuclear spins of noble gases feature extremely long coherence times but are inaccessible to optical photons. Here we realize a coherent interface between light and noble-gas spins that is mediated by alkali atoms. We demonstrate the optical excitation of the noble-gas spins and observe the coherent back-action on the light in the form of high-contrast two-photon spectra. We report on a record two-photon linewidth of 5$\pm$0.7 mHz (millihertz) above room-temperature, corresponding to a one-minute coherence time. This experiment provides a demonstration of coherent bi-directional coupling between light and noble-gas spins, rendering their long-lived spin coherence accessible for manipulations in the optical domain.

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