Non-symmetric quantum interfaces with bilayer atomic arrays

• URL: http://arxiv.org/abs/2604.14101v1
• Date: Wed, 15 Apr 2026 17:16:26 GMT
• Title: Non-symmetric quantum interfaces with bilayer atomic arrays
• Abstract summary: We study quantum light-matter interfaces based on bilayer atomic arrays in free space.<n>We show that the interface efficiency is fully determined by simple scattering observables $-$ reflection and transmission $-$.<n>This reveals new opportunities for optimizing light-matter coupling by operating beyond the Bragg symmetry.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We study quantum light-matter interfaces based on bilayer atomic arrays in free space, considering interlayer spacings $a_z$ that may deviate from the Bragg-symmetric condition, $a_z\in \mathrm{integer}\times λ/2$ with $λ$ the light wavelength. Mapping the problem to a one-dimensional model, we show that the interface efficiency is fully determined by simple scattering observables $-$ reflection and transmission $-$ providing a direct, experimentally accessible characterization. This reveals new opportunities for optimizing light-matter coupling by operating beyond the Bragg symmetry. In particular, we identify configurations that suppress diffraction losses via destructive interference, enabling substantially improved interface efficiencies compared to Bragg-constrained designs. In addition, we introduce a new quantum memory scheme based on a collective dark state whose coupling to light is continuously controlled by tuning the interlayer spacing. More broadly, our results establish non-symmetric atomic arrays as a flexible platform for efficient quantum interfaces in free space.

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