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Highly efficient entanglement swapping and teleportation at telecom wavelength

Entanglement swapping at telecom wavelengths is at the heart of quantum networking in optical fiber infrastructures. Although entanglement swapping has been demonstrated experimentally so far using various types of entangled photon sources both in near-infrared and telecom wavelength regions, the ra...

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Autores principales: Jin, Rui-Bo, Takeoka, Masahiro, Takagi, Utako, Shimizu, Ryosuke, Sasaki, Masahide
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4366812/
https://www.ncbi.nlm.nih.gov/pubmed/25791212
http://dx.doi.org/10.1038/srep09333
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author Jin, Rui-Bo
Takeoka, Masahiro
Takagi, Utako
Shimizu, Ryosuke
Sasaki, Masahide
author_facet Jin, Rui-Bo
Takeoka, Masahiro
Takagi, Utako
Shimizu, Ryosuke
Sasaki, Masahide
author_sort Jin, Rui-Bo
collection PubMed
description Entanglement swapping at telecom wavelengths is at the heart of quantum networking in optical fiber infrastructures. Although entanglement swapping has been demonstrated experimentally so far using various types of entangled photon sources both in near-infrared and telecom wavelength regions, the rate of swapping operation has been too low to be applied to practical quantum protocols, due to limited efficiency of entangled photon sources and photon detectors. Here we demonstrate drastic improvement of the efficiency at telecom wavelength by using two ultra-bright entangled photon sources and four highly efficient superconducting nanowire single photon detectors. We have attained a four-fold coincidence count rate of 108 counts per second, which is three orders higher than the previous experiments at telecom wavelengths. A raw (net) visibility in a Hong-Ou-Mandel interference between the two independent entangled sources was 73.3 ± 1.0% (85.1 ± 0.8%). We performed the teleportation and entanglement swapping, and obtained a fidelity of 76.3% in the swapping test. Our results on the coincidence count rates are comparable with the ones ever recorded in teleportation/swapping and multi-photon entanglement generation experiments at around 800 nm wavelengths. Our setup opens the way to practical implementation of device-independent quantum key distribution and its distance extension by the entanglement swapping as well as multi-photon entangled state generation in telecom band infrastructures with both space and fiber links.
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spelling pubmed-43668122015-03-31 Highly efficient entanglement swapping and teleportation at telecom wavelength Jin, Rui-Bo Takeoka, Masahiro Takagi, Utako Shimizu, Ryosuke Sasaki, Masahide Sci Rep Article Entanglement swapping at telecom wavelengths is at the heart of quantum networking in optical fiber infrastructures. Although entanglement swapping has been demonstrated experimentally so far using various types of entangled photon sources both in near-infrared and telecom wavelength regions, the rate of swapping operation has been too low to be applied to practical quantum protocols, due to limited efficiency of entangled photon sources and photon detectors. Here we demonstrate drastic improvement of the efficiency at telecom wavelength by using two ultra-bright entangled photon sources and four highly efficient superconducting nanowire single photon detectors. We have attained a four-fold coincidence count rate of 108 counts per second, which is three orders higher than the previous experiments at telecom wavelengths. A raw (net) visibility in a Hong-Ou-Mandel interference between the two independent entangled sources was 73.3 ± 1.0% (85.1 ± 0.8%). We performed the teleportation and entanglement swapping, and obtained a fidelity of 76.3% in the swapping test. Our results on the coincidence count rates are comparable with the ones ever recorded in teleportation/swapping and multi-photon entanglement generation experiments at around 800 nm wavelengths. Our setup opens the way to practical implementation of device-independent quantum key distribution and its distance extension by the entanglement swapping as well as multi-photon entangled state generation in telecom band infrastructures with both space and fiber links. Nature Publishing Group 2015-03-20 /pmc/articles/PMC4366812/ /pubmed/25791212 http://dx.doi.org/10.1038/srep09333 Text en Copyright © 2015, Macmillan Publishers Limited. All rights reserved http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder in order to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
spellingShingle Article
Jin, Rui-Bo
Takeoka, Masahiro
Takagi, Utako
Shimizu, Ryosuke
Sasaki, Masahide
Highly efficient entanglement swapping and teleportation at telecom wavelength
title Highly efficient entanglement swapping and teleportation at telecom wavelength
title_full Highly efficient entanglement swapping and teleportation at telecom wavelength
title_fullStr Highly efficient entanglement swapping and teleportation at telecom wavelength
title_full_unstemmed Highly efficient entanglement swapping and teleportation at telecom wavelength
title_short Highly efficient entanglement swapping and teleportation at telecom wavelength
title_sort highly efficient entanglement swapping and teleportation at telecom wavelength
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4366812/
https://www.ncbi.nlm.nih.gov/pubmed/25791212
http://dx.doi.org/10.1038/srep09333
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