Strong-coupling quantum optics in free space with holes in a Fermi sea

• URL: http://arxiv.org/abs/2609.15935v1
• Date: Mon, 14 Sep 2026 17:43:05 GMT
• Title: Strong-coupling quantum optics in free space with holes in a Fermi sea
• Abstract summary: We propose a method to engineer an antenna from the center-of-mass wavefunction of a single atom.<n>We show that a wavepacket antenna becomes a single-atom mirror in the linear response regime.
• Score: 6.57406700845869
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Coherent and efficient light-matter interfaces between an atom and a single mode of the electromagnetic field are essential for quantum technologies. Traditionally, these systems employ optical cavities or waveguides to isolate a specific mode of light, but a more recent approach is to engineer antennas from ordered configurations of trapped ultracold atoms that exhibit controllable and directed scattering. In this work, we propose a method to engineer an antenna from the center-of-mass wavefunction of a single atom, which can produce directed emission and thereby exhibit strong coupling to a target mode of light in free space. We predict that the resulting single-atom cooperativity can be comparable to the current state of the art in optical cavity and waveguide QED experiments. Building on this approach, we show that a wavepacket antenna becomes a single-atom mirror in the linear response regime. We study the modified dipole-dipole interactions and band structure of chains of such emitters, which can exhibit sub- and superradiance at spacings much larger than the wavelength of the light. Extending our approach to multi-level atoms, we propose a method to achieve arbitrary spatial scattering from a single atom, including uni-directional spontaneous emission. Finally, we elucidate how our approach can enhance cooperative scattering in conventional arrays of tightly trapped atoms.

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