Result for "quantum internet",148

First proof-of-principle experiment of quantum repeaters with all photonics｜NTT Basic Research Laboratories | NTT R&D Website

-principle experiment of quantum repeaters with all photonics - First big step towards a ‘quantum internet

https://www.rd.ntt/e/brl/latesttopics/2019/01/latest_topics_201901252028.html

Fundamental Rate-loss Trade-off for the Quantum Internet

Fundamental Rate-loss Trade-off for the Quantum Internet Fundamental Rate-loss Trade-off for the

https://www.rd.ntt/e/brl/result/activities/file/report16/report21E.html

Toward a Quantum Internet | NTT R&D Website

Toward a Quantum Internet | NTT R&D Website NTT R&D Website Research&Activity Toward a Quantum

https://www.rd.ntt/e/research/JN202304_21666.html

Developing a Theory for a Quantum Internet for Global Quantum Communication | NTT R&D Website

Developing a Theory for a Quantum Internet for Global Quantum Communication | NTT R&D Website NTT

https://www.rd.ntt/e/research/JN202408_28857.html

NTT Basic Research Laboratories Theoretical quantum physics research group / Reseach

nonlocality without entanglement" have quantum origin?, arXiv:1303.1269 (2013). The Quantum Internet The

https://www.rd.ntt/brl/group_introduction/ryouron-g/research.html

Koji Azuma | NTT R&D Website

, "Quantum repeaters: From quantum networks to the quantum internet," Reviews of Modern Physics 95, 045006

https://www.rd.ntt/e/organization/researcher/superior/s_041.html

Against a dogma, quantum repeaters for long-distance quantum communication are made all photonic.｜NTT Basic Research Laboratories | NTT R&D Website

communication are made all photonic. - Rendering the quantum internet an ultimate challenge for the future

https://www.rd.ntt/e/brl/latesttopics/2015/04/latest_topics_201504151801.html

Expectations and Prospects for Innovation in Quantum Technology | NTT R&D Website

internet NTT laboratories have been engaged in basic research on various quantum-related technologies

https://www.rd.ntt/e/research/JN202304_21549.html

Secure Optical Transport Network｜NTT R&D Website

computers 3.1 Possibility of advances in quantum computers Current communications on the Internet and other

https://www.rd.ntt/e/research/JN202111_16202.html

Quantum Neural Network on Cloud｜NTT Basic Research Laboratories | NTT R&D Website

utilizing the quantum nature of light, to the public as a cloud service on the internet. The systems and

https://www.rd.ntt/e/brl/latesttopics/2017/11/latest_topics_201711201940.html

NTT Basic Research Laboratories Theoretical quantum physics research group

phenomena The quantum internet Quantum computation and simulation Hybrid quantum systems See more Selected

https://www.rd.ntt/brl/group_introduction/ryouron-g/

東 浩司 | NTT R&D Website

, Hoi-Kwong Lo, and Ilan Tzitrin, "Quantum repeaters: From quantum networks to the quantum internet

https://www.rd.ntt/organization/researcher/superior/s_041.html

G08-04-e.pdf

quantum communication network # Improving customers’ experience A quantum network is realizable with

https://www.rd.ntt/forum/2024/doc/G08-04-e.pdf

NTT Communication Science Laboratories Open House 2014

Internet. This talk will briefly outline the theory and applications of quantum search to show that the

https://www.rd.ntt/cs/event/openhouse/2014/talk/research3/index_en.html

Have an Open Mind and Don’t Worry about Failure to Stay on the Cutting Edge of Science and Technology｜NTT R&D Website

internet—a quantum-enabled version of today’s Internet. My focus is on how we design it and how it would

https://www.rd.ntt/e/research/JN202108_14845.html

SIMULATING COMPLEX QUANTUM NETWORKS WITH TIME CRYSTALS｜NTT Basic Research Laboratories | NTT R&D Website

SIMULATING COMPLEX QUANTUM NETWORKS WITH TIME CRYSTALS｜NTT Basic Research Laboratories | NTT R&D

https://www.rd.ntt/e/brl/latesttopics/2020/10/latest_topics_202010171410.html

Research Activities in NTT Basic Research Laboratories Vol. 27 (2016)

for High-dimensional Time-bin States Fundamental Rate-loss Trade-off for the Quantum Internet Hybrid

https://www.rd.ntt/e/brl/result/activities/file/report16/2016_E.html

NTT物性科学基礎研究所 理論量子物理研究グループ

quantum internet, Reviews of Modern Physics 95 (4), 045006 (2023). K. Azuma, S. Subramanian, G. Kato, Do

https://www.rd.ntt/brl/group_introduction/ryouron-g/index_j.html

Preface

fields of Device Physics, Materials Science, Quantum Electron Physics, and Quantum Optics and Optical

https://www.rd.ntt/e/brl/result/activities/file/report99/E/preface.htm

NTT CS研オープンハウス×未来想論2009 テーマ展示 量子通信が作る安全で快適な世界 ―プロトコル設計にむけた量子通信の数学的性質の解明―

らから入手可能です． 資料の閲覧に必要なAdobe® Reader®はこちらから入手可能です． Windows VistaとInternet Explorerをご利用の環境で，ムービーが再生されない場合はこち

https://www.rd.ntt/cs/event/openhouse/2009/theme/c3/

List of Award Winners (Fiscal 2000)

"Fundamental Research on Opticaland Quantum Physics" Oct. 18, 2000 ISPA AWARD (Internet International Symposium

https://www.rd.ntt/e/brl/result/activities/file/report00/E/data04_e.html

Quantum Algorithms with Potential for New Applications | NTT R&D Website

Quantum Algorithms with Potential for New Applications | NTT R&D Website NTT R&D Website Research

https://www.rd.ntt/e/research/JN202305_21863.html

R&D on Security Contributing to Creation of New Value | NTT R&D Website

the compromised company. According to a report by the FBI Internet Crime Complaint Center released in

https://www.rd.ntt/e/research/JN20200210_h.html

Computing Theory Research Group | NTT Communication Science Laboratories | NTT R&D Website

communication protocols on the internet and efficient computing algorithms on quantum computers etc. are being

https://www.rd.ntt/e/cs/team_project/media/computing_theory/

Improving the Performance of Quantum Key Distribution | NTT R&D Website

Quantum Internet Contact our laboratory Return to Research&Activity Related content

https://www.rd.ntt/e/research/JN202304_21650.html

NTT Basic Research Laboratories Theoretical quantum physics research group / Publications

. Tzitrin Quantum repeaters: From quantum networks to the quantum internet Rev. Mod. Phys. 95, 045006 (2023

https://www.rd.ntt/brl/group_introduction/ryouron-g/publication.html

NTT物性科学基礎研究所 理論量子物理研究グループ / 出版物

. Tzitrin Quantum repeaters: From quantum networks to the quantum internet Rev. Mod. Phys. 95, 045006 (2023

https://www.rd.ntt/brl/group_introduction/ryouron-g/publication_j.html

R&D History | NTT R&D Website

Prototype of a new transistor using quantum thin line developed. Successful field test of a new optical

https://www.rd.ntt/e/about/chronicle/

量子インターネットに向けて | NTT R&D Website

型の量子もつれスワッピングの原理検証実験を報告しています。 ■参考文献 (1)H. J. Kimble：“The quantum internet,” Nature, Vol.453, pp.1023

https://www.rd.ntt/research/JN202304_21666.html

Moving Ising Machines Forward While Taking a Step towards Quantum Networks by Multi-photon Entangled States Based on Time-bin Qubits | NTT R&D Website

solve a combinatorial optimization problem. He is also studying the “quantum internet” by creating the

https://www.rd.ntt/e/research/JN202506_34177.html

Secure Optical-transport-network Technology in Anticipation of the Quantum Computer Era | NTT R&D Website

Secure Optical-transport-network Technology in Anticipation of the Quantum Computer Era | NTT R&D

https://www.rd.ntt/e/research/JN202302_20961.html

Annual_report_2020_E.pdf

photo-electronic converged processors. A quantum internet will enable the implementation of

https://www.rd.ntt/e/brl/result/activities/file/annual_report/Annual_report_2020_E.pdf

Theoretical Quantum Physics Research Group | NTT Basic Research Laboratories | NTT R&D Website

quantum internet Rev. Mod. Phys. 95 (4), 045006 (2023). Y. Liu, W. J. Munro, and J. Twamley A quantum

https://www.rd.ntt/e/brl/group_introduction/group_013.html

NTT物性科学基礎研究所 理論量子物理研究グループ / 研究

: From quantum networks to the quantum internet, Reviews of Modern Physics 95 (4), 045006 (2023). K

https://www.rd.ntt/brl/group_introduction/ryouron-g/research_j.html

Nanomechanics: Outline and Future Prospects | NTT R&D Website

information processing technologies such as machine learning, Internet of Things, and quantum technologies

https://www.rd.ntt/e/research/JN202202_17200.html

Next-generation "Secure Public-key Cryptography" as a Solution to the Rapidly Growing Digital Threat | NTT R&D Website

cryptography quantum cryptography digital currency To prevent cyber-attacks, which are rampant on the Internet

https://www.rd.ntt/e/research/JN202508_35343.html

理論量子物理研究グループ｜NTT物性科学基礎研究所｜NTT R&D Website

quantum internet Rev. Mod. Phys. 95 (4), 045006 (2023). Y. Liu, W. J. Munro, and J. Twamley A quantum

https://www.rd.ntt/brl/group_introduction/group_013.html

NTTBrl__E_h1

on a chip. The quantum internet holds promise for accomplishing quantum communication, such as

https://www.rd.ntt/e/brl/result/activities/file/annual_report/Annual_report_2017_E.pdf

Security｜NTT R&D Website

security in the future As represented by the rapidly growing IoT (Internet of Things), there are concerns

https://www.rd.ntt/e/security/

Book1

quantum internet- N19 量子インターネッﾄ ～未来の通信像～ Quantum Internet -Future communication- N20 スピン軌道相互作用の精密制御による長距

https://www.rd.ntt/brl/event/sp2016/poster/files/poster_list.pdf

情報基礎理論研究グループ｜NTTコミュニケーション科学基礎研究所｜NTT R&D Website

quantum internet," Commun Phys 3, 55, 2020. T. Hatomura, and G. Kato, "Bounds for nonadiabatic transitions

https://www.rd.ntt/cs/team_project/media/computing_theory/

Security R&D Initiatives for Creating a Safe and Secure Society｜NTT R&D Website

connectivity to the Internet are rapidly advancing. The supply chain, which was based on conventional social

https://www.rd.ntt/e/research/JN202104_12175.html

量子コンピュータの設計に向けて｜NTT R&D Website

. Kimble：“The quantum internet，”Nature, Vol. 453，pp. 1023-1030，June 2008. (2)S. M. Brewer，J.S. Chen，A. M

https://www.rd.ntt/research/JN202103_10981.html

Quantum Information Processing via Indirect Quantum Control | NTT R&D Website

Quantum Information Processing via Indirect Quantum Control | NTT R&D Website NTT R&D Website

https://www.rd.ntt/e/research/JN202009_6473.html

Extracting Quantum Power by Using Algorithms and Their Verification | NTT R&D Website

the Performance of Quantum Key Distribution Toward a Quantum Internet Contact our laboratory Return to

https://www.rd.ntt/e/research/JN202304_21634.html

国際会議招待講演一覧

, Sweden (Sep. 2015). (6) K. Azuma, "All-Photonic Quantum Internet", Physical Science Symposium-2015-Boston

https://www.rd.ntt/brl/result/activities/file/report15/data11J.html

List of Invited Talks

-Japan QNANO Workshop, Hindas, Sweden (Sep. 2015). (6) K. Azuma, "All-Photonic Quantum Internet

https://www.rd.ntt/e/brl/result/activities/file/report15/data10E.html

Optical Technologies for Optical Quantum Computing with Continuous Variables | NTT R&D Website

Distribution Toward a Quantum Internet Contact our laboratory Return to Research&Activity Related content

https://www.rd.ntt/e/research/JN202304_21560.html

国際会議招待講演一覧

). (10) K. Azuma, "Theory of the Quantum Internet", Quantum Science Symposium Europe-2016, Cambridge, U.K

https://www.rd.ntt/brl/result/activities/file/report16/data11J.html

List of Invited Talks

, Japan (Oct. 2016). (10) K. Azuma, "Theory of the Quantum Internet", Quantum Science Symposium Europe

https://www.rd.ntt/e/brl/result/activities/file/report16/data10E.html

Standardization Trends Related to Application- and Service-related Technologies | NTT R&D Website

standards being studied by WG 7 include MPEG-IoMT (Internet of Multimedia Things), which is an application

https://www.rd.ntt/e/research/JN202311_23708.html

セキュア光トランスポートネットワーク｜NTT R&D Website

トワークは、拠点間の通信・伝送サービスです。 IPsec IPsecは、インターネットの事実上標準を定めるIETF（Internet Engineering Task Force）で仕様化されている拠点間のセキ

https://www.rd.ntt/research/JN202111_16202.html

Development of Modern Cryptography and Research on Quantum Cryptography | NTT R&D Website

Development of Modern Cryptography and Research on Quantum Cryptography | NTT R&D Website NTT R&D

https://www.rd.ntt/e/research/JN202305_21851.html

Data Governance for Achieving Data Sharing in the IOWN Era | NTT R&D Website

Informatics Laboratories In this article Background The spread of Internet of Things (IoT) devices and

https://www.rd.ntt/e/research/JN202302_20952.html

Research on Standardization of Lightweight Symmetric-key Cryptography for IoT and Protection Technology for Its Implementation | NTT R&D Website

symmetric-key cryptography standardization NIST We are now in an age where the Internet is not only used for

https://www.rd.ntt/e/research/JN202503_32648.html

Publications | NTT Basic Research Laboratories | NTT R&D Website

internet" Phys. Rev. A 96 (3), 032332 (2017). S. Bauml, and K. Azuma "Fundamental limitation on quantum

https://www.rd.ntt/e/brl/result/publications/paper_2017.html

論文｜NTT物性科学基礎研究所｜NTT R&D Website

internet Phys. Rev. A 96 (3), 032332 (2017). S. Bauml, and K. Azuma Fundamental limitation on quantum

https://www.rd.ntt/brl/result/publications/paper_2017.html

Uncrackable quantum cryptography over 'doubled' distances｜NTT Basic Research Laboratories | NTT R&D Website

communication channels such as the wireless communications and the Internet (Vernam cipher). Quantum

https://www.rd.ntt/e/brl/latesttopics/2015/12/latest_topics_201512161930.html

Designing Quantum Computers｜NTT R&D Website

[4]. While these fields are still in their infancy, we can already imagine a quantum internet

https://www.rd.ntt/e/research/JN202103_10981.html

Innovation in Computing Powered by Photonic Technology--Evolution toward IOWN 2.0 and 3.0, and the Leap to Quantum | NTT R&D Website

collaboration with OptQC, RIKEN, and others, developed an Internet-accessible optical quantum computer in 2024

https://www.rd.ntt/e/forum/2025/keynote_1.html

Keynote Speech 1｜Report on the NTT R&D Forum 2021｜NTT R&D Website

person. Along with the world becoming more connected through the Internet, problems such as crimes

https://www.rd.ntt/e/forum/2021/keynote_1.html

Optical Device Technology for Next-generation Computing Using Light | NTT R&D Website

computers with performance far beyond that of conventional computers, such as quantum computers, are

https://www.rd.ntt/e/research/JN202206_18551.html

Updates | NTT R&D Website

Widespread 10/28/2024 Developing a Theory for a Quantum Internet for Global Quantum Communication 09/26/2024

https://www.rd.ntt/e/update_information/

Cutting-edge Research on Cryptography Theory in Response to Changes in Computing Environments | NTT R&D Website

Internet began to spread, a public key of Rivest-Shamir-Adleman (RSA) encryption, having about 512 bits

https://www.rd.ntt/e/research/JN20200223_h.html

Quantum Information Technology Based on Superconducting Quantum Circuits | NTT R&D Website

the Performance of Quantum Key Distribution Toward a Quantum Internet Contact our laboratory Return to

https://www.rd.ntt/e/research/JN202304_21572.html

Annual_report_2019_E.pdf

ultrafast information processing. A quantum internet, enabled by quantum repeaters, is the Holy Grail of

https://www.rd.ntt/e/brl/result/activities/file/annual_report/Annual_report_2019_E.pdf

論文｜NTT物性科学基礎研究所｜NTT R&D Website

"Linear programs for entanglement and key distribution in the quantum internet" Commun. Phys. 3 (1), 55

https://www.rd.ntt/brl/result/publications/paper_2020.html

Publications | NTT Basic Research Laboratories | NTT R&D Website

"Linear programs for entanglement and key distribution in the quantum internet" Commun. Phys. 3 (1), 55

https://www.rd.ntt/e/brl/result/publications/paper_2020.html

Kei Ohmura | NTT Software Innovation Center | NTT R&D Website

IoT technologies, connecting them to the Internet, has been growing year by year. On the other hand

https://www.rd.ntt/e/cct/recruit/294.html

論文｜NTT物性科学基礎研究所｜NTT R&D Website

networks to the quantum internet" Rev. Mod. Phys. 95 (4), 045006 (2023). H. Azuma, W. J. Munro, and K

https://www.rd.ntt/brl/result/publications/paper_2023.html

Publications | NTT Basic Research Laboratories | NTT R&D Website

networks to the quantum internet" Rev. Mod. Phys. 95 (4), 045006 (2023). H. Azuma, W. J. Munro, and K

https://www.rd.ntt/e/brl/result/publications/paper_2023.html

学術論文出版一覧

. Lo, "Fundamental Rate-loss Trade-off for the Quantum Internet", Nature Commun. 7, 13523 (2016). (4) S

https://www.rd.ntt/brl/result/activities/file/report16/data10J.html

Publication List

. Mizutani, and H. K. Lo, "Fundamental Rate-loss Trade-off for the Quantum Internet", Nature Commun. 7, 13523

https://www.rd.ntt/e/brl/result/activities/file/report16/data09E.html

LASOLV™ Computing System: Hybrid Platform for Efficient Combinatorial Optimization | NTT R&D Website

types of Ising computers: quantum annealing machines, such as D-Wave 2000Q, special­ly designed

https://www.rd.ntt/e/research/JN20191127_h.html

Smart Traffic Coordination via Learnable Digital Twins-Future Possibilities of Distributed Deep Learning | NTT R&D Website

systems (Internet of Things (IoT) devices, smartphones, servers, etc.), which is the current mainstream

https://www.rd.ntt/e/research/JN202208_19150.html

Pursuing Fundamental Theory and Applied Technology of Cryptography That Is Secure in an Environment in Which Quantum Computers Are Widespread | NTT R&D Website

Environment in Which Quantum Computers Are Widespread | NTT R&D Website NTT R&D Website Research&Activity

https://www.rd.ntt/e/research/JN202408_28852.html

論文｜NTT物性科学基礎研究所｜NTT R&D Website

author T. Akiho, F. Couedo, H. Irie, K. Suzuki, K. Onomitsu and K. Muraki Engineering quantum spin Hall

https://www.rd.ntt/brl/result/publications/paper_2016.html

Publications | NTT Basic Research Laboratories | NTT R&D Website

(2016). " K. Azuma, A. Mizutani and H. K. Lo "Fundamental rate-loss trade-off for the quantum internet

https://www.rd.ntt/e/brl/result/publications/paper_2016.html

Report_16_E.pdf

◆ Fundamental Rate-loss Trade-off for the Quantum Internet 42 ◆ Hybrid Quantum Engineering Using Spectral Hole

https://www.rd.ntt/e/brl/result/activities/file/report16/Report_16_E.pdf

List of Exhibitions | NTT R&D Website

Quantum Network Research Bio/Medical γ01-01Visualizing motor skill with a smartphone To develop and test a

https://www.rd.ntt/e/forum/2024/exhibit.html

Achieving IOWN/6G and Creating New Value with World-leading Technologies | NTT R&D Website

optical transport network that provides secure network services using post-quantum cryptography (PQC), and

https://www.rd.ntt/e/research/JN202405_26173.html

Message from Shingo Kinoshita, Senior Vice President, Head of R&D Planning Department, NTT Corporation｜NTT R&D Website

can be quickly accessed over the Internet or through artificial intelligence (AI). However, true

https://www.rd.ntt/e/about/message.html

Toshimori Honjo, Ph.D.

Toshimori Honjo, Ph.D. Toshimori Honjo, Ph.D. Senior Research Scientist, Supervisor Quantum

https://www.rd.ntt/brl/people/honjo/

Introduction of Evangelists | NTT Social Informatics Laboratories | NTT R&D Website

laboratory and is leading research on cryptography for the coming quantum era. Recipient of the 48th Ichimura

https://www.rd.ntt/e/sil/overview/evangelist/

Large-scale artificial spin network realized using long-distance optical fiber cavity｜NTT Basic Research Laboratories | NTT R&D Website

Infrastructure Linking Quantum Artificial Brains in Quantum Network" led by Prof. Yoshihisa Yamamoto. This

https://www.rd.ntt/e/brl/latesttopics/2016/04/latest_topics_201604181637.html

Establishment and Development of Cybersecurity Technologies to Solve Problem of Increasing Operation Costs and to Minimize Damage｜NTT R&D Website

agents and communication-analysis engines that analyze the configuration and status of Internet of Things

https://www.rd.ntt/e/research/JN202104_12222.html

NTT R&D FORUM 2025 Event Report | NTT R&D Website

Report NTT R&D FORUM 2025 Event Report 2025 marks the 100th anniversary of the birth of quantum mechanics

https://www.rd.ntt/e/forum/2025/

Optical-lattice-clock-network Technology for Gravitational Potential Sensing | NTT R&D Website

the Performance of Quantum Key Distribution Toward a Quantum Internet Contact our laboratory Return to

https://www.rd.ntt/e/research/JN202304_21619.html

量子計算機時代の到来を見据えた暗号研究 | NTT R&D Website

Key Infrastructure：公開鍵）基盤が実現されました。ほかにも、高速無線通信やクラウドの普及に伴ってIoT（Internet of Things）デバイスや組み込み機器が登場したことで、計算

https://www.rd.ntt/research/JN202509_36082.html

NTTBrl_honbun_E_230228_final.indd

repeaters towards a quantum internet　Koji Azuma The 3rd Fumiko Yonezawa Memorial Prize of the Physical

https://www.rd.ntt/brl/brl/result/activities/file/annual_report/Annual_report_2022_E.pdf

NTTBrl_honbun_E_230228_final.indd

repeaters towards a quantum internet　Koji Azuma The 3rd Fumiko Yonezawa Memorial Prize of the Physical

https://www.rd.ntt/e/brl/result/activities/file/annual_report/Annual_report_2022_E.pdf

Communication Science that Adapts to the Changing Present and Creates a Sustainable Future-Aiming to Create Technology that Brings Harmony and Symbiosis among People, Society, and the Environment | NTT R&D Website

abilities as humans, i.e., seeing, listening, and speaking, as well as quantum information theory and

https://www.rd.ntt/e/research/JN202208_19139.html

What's IOWN? - Change the World | NTT R&D Website

Internet has proven useful for many services and business activities through adoption of common protocols

https://www.rd.ntt/e/research/JN20200109_h.html

NTTBrl_honbun_E_260302.indd

-speed, long-distance quantum communication, helping to shape the emerging field of the quantum internet

https://www.rd.ntt/brl/result/activities/file/annual_report/NTTBrl_E_260310_print.pdf

Unlimited Innovation for a Global Sustainable Society by IOWN | NTT R&D Website

, neurological analysis, and quantum mechanics. IOWN: breakthrough innovation We are now facing many crises such

https://www.rd.ntt/e/forum/2024/keynote_3.html

Creating a Map of Science and Connecting with the World and Future through It｜NTT R&D Website

Technical Review, March 2021. Quantum correlation brings out the potential of electrons Please tell us about

https://www.rd.ntt/e/research/JN202101_9584.html

論文｜NTT物性科学基礎研究所｜NTT R&D Website

resonance spectra of GaAs/AlGaAs quantum well under tilted magnetic fields of short pulse up to 150 T

https://www.rd.ntt/brl/result/publications/paper_2000.html

Publications | NTT Basic Research Laboratories | NTT R&D Website

resonance spectra of GaAs/AlGaAs quantum well under tilted magnetic fields of short pulse up to 150 T

https://www.rd.ntt/e/brl/result/publications/paper_2000.html

Towards the Era of IOWN | NTT R&D Website

technical issues must be overcome. First, the use of the Internet of Things, big data, AI, etc. is

https://www.rd.ntt/e/research/JN20200104_h.html

高密度・低消費電力な短距離光インター コネクションに向けたデバイス技術｜NTT R&D Website

慎治（まつお しんじ） はじめに IoT（Internet of Things）の進展やAI（人工知能）の利用拡大により、従来の予想を超える膨大なデータが取り扱われるようになり今後もこの傾向は持続

https://www.rd.ntt/research/JN202008_6173.html