Subradiant Bell states in distant atomic arrays

Abstract

We study collective `free-space' radiation properties of two distant single-layer arrays of quantum emitters as two-level atoms. We show that this system can support a long-lived Bell superposition state of atomic excitations exhibiting strong subradiance, which corresponds to a non-local excitation of the two arrays. We describe the preparation of these states and their application in quantum information as resource of non-local entanglement, including deterministic quantum state transfer with high fidelity between the arrays representing quantum memories. We discuss experimental realizations using cold atoms in optical trap arrays with subwavelength spacing, and analyze the role of imperfections.

5 + 12 pages, 3 + 6 figures

References in corpus (5)

• An atom-by-atom assembler of defect-free arbitrary 2d atomic arrays
• Quantum information transfer using photons
• Cooperative resonances in light scattering from two-dimensional atomic arrays
• Storing light with subradiant correlations in arrays of atoms
• Collective generation of quantum states of light by entangled atoms

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• Radiative toroidal dipole and anapole excitations in collectively responding arrays of atoms
• Collective Photon Assisted Dressing of Atomic Levels by the number $N$ of Correlated Atoms