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Quantum key distribution over 120 km using ultrahigh purity single-photon source and superconducting single-photon detectors
Advances in single-photon sources (SPSs) and single-photon detectors (SPDs) promise unique applications in the field of quantum information technology. In this paper, we report long-distance quantum key distribution (QKD) by using state-of-the-art devices: a quantum-dot SPS (QD SPS) emitting a photo...
Autores principales: | , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group
2015
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4585911/ https://www.ncbi.nlm.nih.gov/pubmed/26404010 http://dx.doi.org/10.1038/srep14383 |
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author | Takemoto, Kazuya Nambu, Yoshihiro Miyazawa, Toshiyuki Sakuma, Yoshiki Yamamoto, Tsuyoshi Yorozu, Shinichi Arakawa, Yasuhiko |
author_facet | Takemoto, Kazuya Nambu, Yoshihiro Miyazawa, Toshiyuki Sakuma, Yoshiki Yamamoto, Tsuyoshi Yorozu, Shinichi Arakawa, Yasuhiko |
author_sort | Takemoto, Kazuya |
collection | PubMed |
description | Advances in single-photon sources (SPSs) and single-photon detectors (SPDs) promise unique applications in the field of quantum information technology. In this paper, we report long-distance quantum key distribution (QKD) by using state-of-the-art devices: a quantum-dot SPS (QD SPS) emitting a photon in the telecom band of 1.5 μm and a superconducting nanowire SPD (SNSPD). At the distance of 100 km, we obtained the maximal secure key rate of 27.6 bps without using decoy states, which is at least threefold larger than the rate obtained in the previously reported 50-km-long QKD experiment. We also succeeded in transmitting secure keys at the rate of 0.307 bps over 120 km. This is the longest QKD distance yet reported by using known true SPSs. The ultralow multiphoton emissions of our SPS and ultralow dark count of the SNSPD contributed to this result. The experimental results demonstrate the potential applicability of QD SPSs to practical telecom QKD networks. |
format | Online Article Text |
id | pubmed-4585911 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2015 |
publisher | Nature Publishing Group |
record_format | MEDLINE/PubMed |
spelling | pubmed-45859112015-09-30 Quantum key distribution over 120 km using ultrahigh purity single-photon source and superconducting single-photon detectors Takemoto, Kazuya Nambu, Yoshihiro Miyazawa, Toshiyuki Sakuma, Yoshiki Yamamoto, Tsuyoshi Yorozu, Shinichi Arakawa, Yasuhiko Sci Rep Article Advances in single-photon sources (SPSs) and single-photon detectors (SPDs) promise unique applications in the field of quantum information technology. In this paper, we report long-distance quantum key distribution (QKD) by using state-of-the-art devices: a quantum-dot SPS (QD SPS) emitting a photon in the telecom band of 1.5 μm and a superconducting nanowire SPD (SNSPD). At the distance of 100 km, we obtained the maximal secure key rate of 27.6 bps without using decoy states, which is at least threefold larger than the rate obtained in the previously reported 50-km-long QKD experiment. We also succeeded in transmitting secure keys at the rate of 0.307 bps over 120 km. This is the longest QKD distance yet reported by using known true SPSs. The ultralow multiphoton emissions of our SPS and ultralow dark count of the SNSPD contributed to this result. The experimental results demonstrate the potential applicability of QD SPSs to practical telecom QKD networks. Nature Publishing Group 2015-09-25 /pmc/articles/PMC4585911/ /pubmed/26404010 http://dx.doi.org/10.1038/srep14383 Text en Copyright © 2015, Macmillan Publishers Limited 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 to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ |
spellingShingle | Article Takemoto, Kazuya Nambu, Yoshihiro Miyazawa, Toshiyuki Sakuma, Yoshiki Yamamoto, Tsuyoshi Yorozu, Shinichi Arakawa, Yasuhiko Quantum key distribution over 120 km using ultrahigh purity single-photon source and superconducting single-photon detectors |
title | Quantum key distribution over 120 km using ultrahigh purity single-photon source and superconducting single-photon detectors |
title_full | Quantum key distribution over 120 km using ultrahigh purity single-photon source and superconducting single-photon detectors |
title_fullStr | Quantum key distribution over 120 km using ultrahigh purity single-photon source and superconducting single-photon detectors |
title_full_unstemmed | Quantum key distribution over 120 km using ultrahigh purity single-photon source and superconducting single-photon detectors |
title_short | Quantum key distribution over 120 km using ultrahigh purity single-photon source and superconducting single-photon detectors |
title_sort | quantum key distribution over 120 km using ultrahigh purity single-photon source and superconducting single-photon detectors |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4585911/ https://www.ncbi.nlm.nih.gov/pubmed/26404010 http://dx.doi.org/10.1038/srep14383 |
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