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Quantum entanglement at ambient conditions in a macroscopic solid-state spin ensemble

Entanglement is a key resource for quantum computers, quantum-communication networks, and high-precision sensors. Macroscopic spin ensembles have been historically important in the development of quantum algorithms for these prospective technologies and remain strong candidates for implementing them...

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Autores principales: Klimov, Paul V., Falk, Abram L., Christle, David J., Dobrovitski, Viatcheslav V., Awschalom, David D.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Association for the Advancement of Science 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4681335/
https://www.ncbi.nlm.nih.gov/pubmed/26702444
http://dx.doi.org/10.1126/sciadv.1501015
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author Klimov, Paul V.
Falk, Abram L.
Christle, David J.
Dobrovitski, Viatcheslav V.
Awschalom, David D.
author_facet Klimov, Paul V.
Falk, Abram L.
Christle, David J.
Dobrovitski, Viatcheslav V.
Awschalom, David D.
author_sort Klimov, Paul V.
collection PubMed
description Entanglement is a key resource for quantum computers, quantum-communication networks, and high-precision sensors. Macroscopic spin ensembles have been historically important in the development of quantum algorithms for these prospective technologies and remain strong candidates for implementing them today. This strength derives from their long-lived quantum coherence, strong signal, and ability to couple collectively to external degrees of freedom. Nonetheless, preparing ensembles of genuinely entangled spin states has required high magnetic fields and cryogenic temperatures or photochemical reactions. We demonstrate that entanglement can be realized in solid-state spin ensembles at ambient conditions. We use hybrid registers comprising of electron-nuclear spin pairs that are localized at color-center defects in a commercial SiC wafer. We optically initialize 10(3) identical registers in a 40-μm(3) volume (with [Formula: see text] fidelity) and deterministically prepare them into the maximally entangled Bell states (with 0.88 ± 0.07 fidelity). To verify entanglement, we develop a register-specific quantum-state tomography protocol. The entanglement of a macroscopic solid-state spin ensemble at ambient conditions represents an important step toward practical quantum technology.
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spelling pubmed-46813352015-12-23 Quantum entanglement at ambient conditions in a macroscopic solid-state spin ensemble Klimov, Paul V. Falk, Abram L. Christle, David J. Dobrovitski, Viatcheslav V. Awschalom, David D. Sci Adv Research Articles Entanglement is a key resource for quantum computers, quantum-communication networks, and high-precision sensors. Macroscopic spin ensembles have been historically important in the development of quantum algorithms for these prospective technologies and remain strong candidates for implementing them today. This strength derives from their long-lived quantum coherence, strong signal, and ability to couple collectively to external degrees of freedom. Nonetheless, preparing ensembles of genuinely entangled spin states has required high magnetic fields and cryogenic temperatures or photochemical reactions. We demonstrate that entanglement can be realized in solid-state spin ensembles at ambient conditions. We use hybrid registers comprising of electron-nuclear spin pairs that are localized at color-center defects in a commercial SiC wafer. We optically initialize 10(3) identical registers in a 40-μm(3) volume (with [Formula: see text] fidelity) and deterministically prepare them into the maximally entangled Bell states (with 0.88 ± 0.07 fidelity). To verify entanglement, we develop a register-specific quantum-state tomography protocol. The entanglement of a macroscopic solid-state spin ensemble at ambient conditions represents an important step toward practical quantum technology. American Association for the Advancement of Science 2015-11-20 /pmc/articles/PMC4681335/ /pubmed/26702444 http://dx.doi.org/10.1126/sciadv.1501015 Text en Copyright © 2015, The Authors http://creativecommons.org/licenses/by-nc/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial license (http://creativecommons.org/licenses/by-nc/4.0/) , which permits use, distribution, and reproduction in any medium, so long as the resultant use is not for commercial advantage and provided the original work is properly cited.
spellingShingle Research Articles
Klimov, Paul V.
Falk, Abram L.
Christle, David J.
Dobrovitski, Viatcheslav V.
Awschalom, David D.
Quantum entanglement at ambient conditions in a macroscopic solid-state spin ensemble
title Quantum entanglement at ambient conditions in a macroscopic solid-state spin ensemble
title_full Quantum entanglement at ambient conditions in a macroscopic solid-state spin ensemble
title_fullStr Quantum entanglement at ambient conditions in a macroscopic solid-state spin ensemble
title_full_unstemmed Quantum entanglement at ambient conditions in a macroscopic solid-state spin ensemble
title_short Quantum entanglement at ambient conditions in a macroscopic solid-state spin ensemble
title_sort quantum entanglement at ambient conditions in a macroscopic solid-state spin ensemble
topic Research Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4681335/
https://www.ncbi.nlm.nih.gov/pubmed/26702444
http://dx.doi.org/10.1126/sciadv.1501015
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