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

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DOIResolve DOI: http://doi.org/10.1038/s41598-017-01509-6
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TypeArticle
Journal titleScientific Reports
ISSN2045-2322
Volume7
Issue1
AbstractGlobal, 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 (SCHSH > 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.
Publication date
PublisherNature Publishing Group
LanguageEnglish
AffiliationAdvanced Electronics and Photonics; National Research Council Canada
Peer reviewedYes
NRC number[identifier]
NPARC number23002619
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Record identifier1afa5ae7-8af0-4c16-bb10-2b39988ddc9d
Record created2017-12-07
Record modified2017-12-07
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