Subradiant EPR states in distant atomic arrays.
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 superposition state of atomic excitations exhibiting strong subradiance, which corresponds to a non-local EPR-correlated 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.
Publisher URL: http://arxiv.org/abs/1901.02665
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