Detection of nonlocal spin entanglement by light emission from a superconducting p − n junction

We model a superconducting p - n junction in which the n and the p sides are contacted through two optical quantum dots (QDs), each embedded into a photonic nanocavity. Whenever a Cooper pair is transferred from the n side to the p side, two photons are emitted. When the two electrons of a Cooper pa...

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Published in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2015-08, Vol.92 (5), Article 054514
Main Authors: Schroer, Alexander, Recher, Patrik
Format: Article
Language:English
Subjects:
Condensed matter
Cooper pairs
Entanglement
Light emission
Nanostructure
Photons
Quantum dots
Superconductivity
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description We model a superconducting p - n junction in which the n and the p sides are contacted through two optical quantum dots (QDs), each embedded into a photonic nanocavity. Whenever a Cooper pair is transferred from the n side to the p side, two photons are emitted. When the two electrons of a Cooper pair are transported through different QDs, polarization-entangled photons are created, provided that the Cooper pairs retain their spin singlet character while being spatially separated on the two QDs. We show that a Clauser-Holt-Shimony-Horne (CHSH) Bell-type measurement is able to detect the entanglement of the photons over a broad range of microscopic parameters, even in the presence of parasitic processes and imperfections.
doi_str_mv 10.1103/PhysRevB.92.054514
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source American Physical Society:Jisc Collections:APS Read and Publish 2023-2025 (reading list)
subjects Condensed matter
Cooper pairs
Entanglement
Light emission
Nanostructure
Photons
Quantum dots
Superconductivity
title Detection of nonlocal spin entanglement by light emission from a superconducting p − n junction
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