Subradiant Bell 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 Bell superposition state of atomic excitations exhibiting strong subradiance, which corresponds to a non-local excit...

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Bibliographic Details
Published in:arXiv.org 2019-03
Main Authors: P -O Guimond, Grankin, A, Vasilyev, D V, Vermersch, B, Zoller, P
Format: Article
Language:English
Subjects:
Arrays
Atomic excitations
Cold atoms
Cold traps
Emitters
Quantum entanglement
Quantum phenomena
Quantum theory
Superposition (mathematics)
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Summary: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.
ISSN:2331-8422
DOI:10.48550/arxiv.1901.02665