Hyperfine interaction limits polarization entanglement of photons from semiconductor quantum dots

Abstract

Excitons in quantum dots are excellent sources of polarization-entangled photon pairs, but a quantitative understanding of their interaction with the nuclear spin bath is still missing. Here we investigate the role of hyperfine energy shifts using experimentally accessible parameters and derive an upper limit to the achievable entanglement fidelity. Our results are consistent with all available literature, indicate that spin noise is often the dominant process limiting the entanglement in InGaAs quantum dots, and suggest routes to alleviate its effect.

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Item Type:	Article
Authors/Creators:	Schimpf, C. https://orcid.org/0000-0001-5722-6877 Basset, F.B. https://orcid.org/0000-0002-2148-0010 Aigner, M. https://orcid.org/0000-0002-2113-3457 Attenender, W. Ginés, L. https://orcid.org/0000-0001-9980-054X Undeutsch, G. https://orcid.org/0000-0001-5080-7695 Reindl, M. https://orcid.org/0000-0001-7333-515X Huber, D. https://orcid.org/0000-0003-2809-2413 Gangloff, D. https://orcid.org/0000-0002-7100-0847 Chekhovich, E.A. https://orcid.org/0000-0003-1626-9015 Schneider, C. Höfling, S. https://orcid.org/0000-0003-0034-4682 Predojević, A. https://orcid.org/0000-0003-1840-0830 Trotta, R. https://orcid.org/0000-0002-9515-6790 Rastelli, A. https://orcid.org/0000-0002-1343-4962
Copyright, Publisher and Additional Information:	© 2023 Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license (https://creativecommons.org/licenses/by/4.0/). Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.
Dates:	Published: 15 August 2023 Published (online): 15 August 2023 Accepted: 17 July 2023 Submitted: 18 February 2023
Institution:	The University of Sheffield
Academic Units:	The University of Sheffield > Faculty of Science (Sheffield) > Department of Physics and Astronomy (Sheffield)
Depositing User:	Symplectic Sheffield
Date Deposited:	01 Dec 2023 09:52
Last Modified:	01 Dec 2023 09:52
Status:	Published
Publisher:	American Physical Society (APS)
Refereed:	Yes
Identification Number:	10.1103/physrevb.108.l081405
Open Archives Initiative ID (OAI ID):	oai:eprints.whiterose.ac.uk:205922

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Hyperfine interaction limits polarization entanglement of photons from semiconductor quantum dots

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