Bright nanoscale source of deterministic entangled photon pairs violating Bell’s inequality

Abstract Global, secure quantum channels will require efficient distribution of entangled photons. Long distance, low-loss interconnects can only be realized using photons as quantum information carriers. However, a quantum light source combining both high qubit fidelity and on-demand bright emissio...

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Autores principales:	Klaus D. Jöns, Lucas Schweickert, Marijn A. M. Versteegh, Dan Dalacu, Philip J. Poole, Angelo Gulinatti, Andrea Giudice, Val Zwiller, Michael E. Reimer
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/a5be34f2acfb489898553177bc108c1e
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spelling	oai:doaj.org-article:a5be34f2acfb489898553177bc108c1e2021-12-02T11:41:00ZBright nanoscale source of deterministic entangled photon pairs violating Bell’s inequality10.1038/s41598-017-01509-62045-2322https://doaj.org/article/a5be34f2acfb489898553177bc108c1e2017-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-01509-6https://doaj.org/toc/2045-2322Abstract Global, secure quantum channels will require efficient distribution of entangled photons. Long distance, low-loss interconnects can only be realized using photons as quantum information carriers. However, a quantum light source combining both high qubit fidelity and on-demand bright emission has proven elusive. Here, we show a bright photonic nanostructure generating polarization-entangled photon pairs that strongly violates Bell’s inequality. A highly symmetric InAsP quantum dot generating entangled photons is encapsulated in a tapered nanowire waveguide to ensure directional emission and efficient light extraction. We collect ~200 kHz entangled photon pairs at the first lens under 80 MHz pulsed excitation, which is a 20 times enhancement as compared to a bare quantum dot without a photonic nanostructure. The performed Bell test using the Clauser-Horne-Shimony-Holt inequality reveals a clear violation (S CHSH > 2) by up to 9.3 standard deviations. By using a novel quasi-resonant excitation scheme at the wurtzite InP nanowire resonance to reduce multi-photon emission, the entanglement fidelity (F = 0.817 ± 0.002) is further enhanced without temporal post-selection, allowing for the violation of Bell’s inequality in the rectilinear-circular basis by 25 standard deviations. Our results on nanowire-based quantum light sources highlight their potential application in secure data communication utilizing measurement-device-independent quantum key distribution and quantum repeater protocols.Klaus D. JönsLucas SchweickertMarijn A. M. VersteeghDan DalacuPhilip J. PooleAngelo GulinattiAndrea GiudiceVal ZwillerMichael E. ReimerNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-11 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Klaus D. Jöns Lucas Schweickert Marijn A. M. Versteegh Dan Dalacu Philip J. Poole Angelo Gulinatti Andrea Giudice Val Zwiller Michael E. Reimer Bright nanoscale source of deterministic entangled photon pairs violating Bell’s inequality
description	Abstract Global, secure quantum channels will require efficient distribution of entangled photons. Long distance, low-loss interconnects can only be realized using photons as quantum information carriers. However, a quantum light source combining both high qubit fidelity and on-demand bright emission has proven elusive. Here, we show a bright photonic nanostructure generating polarization-entangled photon pairs that strongly violates Bell’s inequality. A highly symmetric InAsP quantum dot generating entangled photons is encapsulated in a tapered nanowire waveguide to ensure directional emission and efficient light extraction. We collect ~200 kHz entangled photon pairs at the first lens under 80 MHz pulsed excitation, which is a 20 times enhancement as compared to a bare quantum dot without a photonic nanostructure. The performed Bell test using the Clauser-Horne-Shimony-Holt inequality reveals a clear violation (S CHSH > 2) by up to 9.3 standard deviations. By using a novel quasi-resonant excitation scheme at the wurtzite InP nanowire resonance to reduce multi-photon emission, the entanglement fidelity (F = 0.817 ± 0.002) is further enhanced without temporal post-selection, allowing for the violation of Bell’s inequality in the rectilinear-circular basis by 25 standard deviations. Our results on nanowire-based quantum light sources highlight their potential application in secure data communication utilizing measurement-device-independent quantum key distribution and quantum repeater protocols.
format	article
author	Klaus D. Jöns Lucas Schweickert Marijn A. M. Versteegh Dan Dalacu Philip J. Poole Angelo Gulinatti Andrea Giudice Val Zwiller Michael E. Reimer
author_facet	Klaus D. Jöns Lucas Schweickert Marijn A. M. Versteegh Dan Dalacu Philip J. Poole Angelo Gulinatti Andrea Giudice Val Zwiller Michael E. Reimer
author_sort	Klaus D. Jöns
title	Bright nanoscale source of deterministic entangled photon pairs violating Bell’s inequality
title_short	Bright nanoscale source of deterministic entangled photon pairs violating Bell’s inequality
title_full	Bright nanoscale source of deterministic entangled photon pairs violating Bell’s inequality
title_fullStr	Bright nanoscale source of deterministic entangled photon pairs violating Bell’s inequality
title_full_unstemmed	Bright nanoscale source of deterministic entangled photon pairs violating Bell’s inequality
title_sort	bright nanoscale source of deterministic entangled photon pairs violating bell’s inequality
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/a5be34f2acfb489898553177bc108c1e
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Bright nanoscale source of deterministic entangled photon pairs violating Bell’s inequality

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