Publications

International Activities

Invited Papers

• Shota Nagayama, Toshihiko Sasaki, Akihito Soeda. Backcasting Perspectives on Services of Future Quantum Internet. 2024 IEEE International Conference on Quantum Software (QSW), Shenzhen, China, 2024, pp. 12-18, doi: 10.1109/QSW62656.2024.00015.

Invited Talks

• Shota Nagayama. Quantum Network Systems and Testbed efforts in Japan. To appear in The 4th Workshop on Quantum Repeaters and Networks. Sep. 2024.
• Shota Nagayama. Backcasting Perspectives on Services of Future Quantum Internet. IEEE Symposium on Quantum Software: Towards Quantum Utility in the NISQ Era (QSWUtil). Jul. 2024.

RFCs (Internet Requests For Comments)

• Wojciech Kozlowski, Stephanie Wehner, Rodney Van Meter, Bruno Rijsman, Angela Sara Cacciapuoti, Marcello Caleffi, & Shota Nagayama. RFC 9340: Architectural principles for a quantum internet. RFC Editor. Mar. 2023.

Journal Papers

• Takahiko Satoh, Shota Nagayama, Shigeya Suzuki, Takaaki Matsuo and Rodney Van Meter. Attacking the Quantum Internet. IEEE Transaction on Quantum Engineering 2: 4102617, Jul. 2021
• Kenji Kubo, Yuya Nakagawa, Suguru Endo, Shota Nagayama. Variational quantum simulations of stochastic differential equations. Physical Review A 103 (5), 052425, May. 2021.
• Takaaki Matsuo, Takahiko Satoh, Shota Nagayama and Rodney Van Meter. Analysis of Measurement-based Quantum Network Coding over Repeater Networks under Noisy Conditions. Phys. Rev. A, 97:062328, Jun. 2018.
• Takahiko Satoh, Shota Nagayama, and Rodney Van Meter. The Network Impact of Hijacking a Quantum Repeater. Quantum Science and Technology 3 (3), 034008, May. 2018.
• S. Nagayama, A. G. Fowler, D. Horsman, S. J. Devitt, and R. Van Meter. Surface code error correction on a defective lattice. New Journal of Physics, 19(2):023050, 2017.
• S. Nagayama, T. Satoh, and R. Van Meter. State injection, lattice surgery, and dense packing of the deformation-based surface code. Phys. Rev. A, 95:012321, Jan. 2017.
• S. Nagayama, B.-S. Choi, S. Devitt, S. Suzuki, and R. Van Meter. Interoperability in encoded quantum repeater networks. Phys. Rev. A, 93:042338, Apr 2016.
• Takahiko Satoh, Kaori Ishizaki, Shota Nagayama and Rodney Van Meter. Analysis of quantum network coding for realistic repeater networks. Physical Review A, 93:032302, Mar. 2016.

International Conferences with Proceedings

• Yoshihiro Mori, Toshihiko Sasaki, Rikizo Ikuta, Kentaro Teramoto, Hiroyuki Ohno, Michal Hajdusek, Rodney Van Meter, & Shota Nagayama. Scalable Timing Coordination of Bell State Analyzers in Quantum Networks. arXiv preprint arXiv:2405.09881. To appear in IEEE International Conference on Quantum Computing and Engineering (QCE) 2024. Sep. 2024.
• Kento Samuel Soon, Naphan Benchasattabuse, Michal Hajdusek, Kentaro Teramoto, Shota Nagayama, & Rodney Van Meter. Performance of Quantum Networks Using Heterogeneous Link Architectures. arXiv preprint arXiv:2405.09862. To appear in IEEE International Conference on Quantum Computing and Engineering (QCE) 2024. Sep. 2024.
• Marii Koyama, Claire Yun, Amin Taherkhani, Naphan Benchasattabuse, Bernard Ousmane Sane, Michal Hajdusek, Shota Nagayama, & Rodney Van Meter. Optimal Switching Networks for Paired-Egress Bell State Analyzer Pools. arXiv preprint arXiv:2405.09860. To appear in IEEE International Conference on Quantum Computing and Engineering (QCE) 2024. Sep. 2024.
• Kento Samuel Soon, Michal Hajdusek, Shota Nagayama, Naphan Benchasattabuse, Kentaro Teramoto, Ryosuke Satoh, & Rodney Van Meter. An implementation and analysis of a practical quantum link architecture utilizing entangled photon sources. IEEE International Conference on Quantum Communications, Networking, and Computing (QCNC) 2024. Kanazawa, Japan. July 2024. pp. 25-32, DOI: 10.1109/QCNC62729.2024.00014.
• Kentaro Teramoto, Michal Hajdusek, Toshihiko Sasaki, Rodney Van Meter, & Shota Nagayama. Ruleset-based recursive quantum internetworking. In Proceedings of the 1st Workshop on Quantum Networks and Distributed Quantum Computing (pp. 25-30). Sep. 2023.
• Ryosuke Satoh, Michal Hajdusek, Naphan Benchasattabuse, Shota Nagayama, Kentaro Teramoto, Takaaki Matsuo, Sara Ayman Metwalli, Poramet Pathumsoot, Takahiko Satoh, Shigeya Suzuki, & others. Quisp: a quantum internet simulation package. IEEE International Conference on Quantum Computing and Engineering (QCE) 2022 (pp. 353-364). Sep., 2022.
• Rodney Van Meter, Ryosuke Satoh, Naphan Benchasattabuse, Kentaro Teramoto, Takaaki Matsuo, Michal Hajdusek, Takahiko Satoh, Shota Nagayama, & Shigeya Suzuki. A quantum internet architecture. IEEE International Conference on Quantum Computing and Engineering (QCE) 2022 (pp. 341-352). Sep. 2022.

Panel Discussions

• (invited) Quantum Network Testbed Work. To appear in The 4th Workshop for Quantum Repeater Networks. Sep. 2024.
• (invited) Quantum Network Testbed Panel Discussion. To appear in IEEE QCE 2024. Sep. 2024.
• Young Researcher Session: Big Vision of the Quantum Internet. Quantum Innovation 2022. Nov. 2022.

Birds-of-a-Feather Organization

• Sho Morishita, Yusuke Nagato, Konomi Higo, Kentaro Teramoto and Shota Nagayama. Quantum Quest: Dialogue and Exploration of Quantum Governance Through a Card Game. To appear in IEEE International Conference on Quantum Computing and Engineering (QCE) 2024. Sep. 2024.
• Shota Nagayama, Rodney Van Meter, Wenji Wu and Inder Monga. What Makes Quantum Networks? A Quantum Network Protocols’ Perspective: From Physical Layer to Application Layer. To appear in IEEE International Conference on Quantum Computing and Engineering (QCE) 2024. Sep. 2024.

Submitted/Pre-prints/in progress papers

• Fumiyoshi Kobayashi, & Shota Nagayama. (2024). Erasure-tolerance protocol for the surface codes on Rydberg atomic quantum computers. arXiv preprint arXiv:2404.12656.
• Shota Nagayama. Towards End-to-End Error Management for a Quantum Internet. arXiv:2112.07185, Dec. 2021.
• Rodney Van Meter, Takahiko Satoh, Shota Nagayama, Takaaki Matsuo and Shigeya Suzuki. Optimizing Timing of High-Success-Probability Quantum Repeaters. arXiv:1701.04586, Jan. 2017.

Internet Drafts

• S. Nagayama and R. Van Meter. IKE for IPsec with QKD. draft-nagayama-ipsecme-ipsec-with-qkd-01. Oct. 2014. expires April 30, 2015.
• S. Nagayama and R. Van Meter. IKE for IPsec with QKD. draft-nagayama-ipsecme-ipsec-with-qkd-00. Oct. 2009. expires April 22, 2010.

Hackathon Activities

• Shota Nagayama, Shigeya Suzuki, Hirotaka Nakajima. “Quantum Ping” and Hackathon report. QIRG, IRTF104. Prague, Czech Republic. Mar 2019.
• Shota Nagayama, Hirotaka Nakajima.Quantum Digital Signature: “Hanko”. Quantum Internet Hackathon 2018, Amsterdam, Netherland. Oct 2018.

Workshops, Conferences Without Proceedings and Posters

• Amin Taherkhani, Kentaro Teramoto, Andrew Todd, Rodney Van Meter and Shota Nagayama. A Scalable Framework for Automation of Quantum Network Experiments. To appear in IEEE International Conference on Quantum Computing and Engineering (QCE) 2024. Sep. 2024.
• Michal Hajdušek, Rod Van Meter, Monet Tokuyama, Akihito Soeda, Shota Nagayama. Timing regime in Quantum networks. IETF119 QIRG. Mar. 2024.
• Rodney Van Meter, Ryosuke Satoh, Makoto Nakai, Shota Nagayama. IETF119 QIRG. Mar. Mar. 2024.
• Fumiyoshi Kobayashi, Shota Nagayama. Erasure-tolerance protocol for the surface codes on Rydberg atomic quantum computers. QIP. Jan. 2024.
• Shota Nagayama and Rodney Van Meter. Host Speaker Series: Quantum Internet.IETF116. Mar. 2023. quantum simulations of stochastic differential equations. Asian Conference on Quantum Information Science 2021, Online Japan, Sep 2021.
• Shota Nagayama, Takahiko Satoh, Kenji Kubo. Fundamental scheme to descrive scenarios in extensive-form games by Quantum Annealing. Asian Conference on Quantum Information Science 2019, Korea Institute of Advanced Study. Korea, Aug 2019.
• Shota Nagayama, Zhikuan Zhao, Takahiko Satoh. Conditions Which Determine Quantum Network Coding Useful in the Butterfly Network. Asian Conference on Quantum Information Science 2018, Nagoya Univ. Japan, Sep 2018.
• S. Ni, and S. Nagayama. Performance comparison on CFRBM between GPU and Quantum Annealing. GPU Technology Conference Japan 2018 (GTC Japan 2018). Sep. 2018.
• Shota Nagayama, Shigeya Suzuki, Takahiko Satoh, Takaaki Matsuo and Rodney Van Meter. Analysis of Scalable quantum router architecture with code interoperability. 2nd Workshop for Quantum Repeaters and Networks, Austria, Sep. 2017.
• Shota Nagayama, Shigeya Suzuki, Takahiko Satoh, Takaaki Matsuo and Rodney Van Meter. Scalable quantum router architecture with code interoperability. QCMC2016, Singapore, Jul. 2016.
• Takaaki Matsuo, Takahiko Satoh, Shota Nagayama, Shigeya Suzuki and Rodney Van Meter. Wide-area topology of a Quantum Internet. QCMC2016, Singapore, Jul. 2016.
• Rodney Van Meter, Shigeya Suzuki, Shota Nagayama, Takahiko Satoh, Takaaki Matsuo, Amin Taherkhani, Simon Devitt and Joe Touch. Large-Scale Simulation of the Quantum Internet. QCMC2016, Singapore, Jul. 2016.
• Takahiko Satoh, Shigeya Suzuki, Shota Nagayama, Takaaki Matsuo and Rodney Van Meter. Routing on a Quantum Internet. QCMC2016, Singapore, Jul. 2016.
• Shigeya Suzuki, Rodney Van Meter, Shota Nagayama, Takahiko Satoh and Takaaki Matsuo. Architecture of software simulation of a Quantum Internet. QCMC2016, Singapore, Jul. 2016.
• Shota Nagayama, Byung-Soo Choi, Simon Devitt, Shigeya Suzuki, Rodney Van Meter. Error and resource estimation of generalized heterogeneous coded Bell pairs. Workshop for Quantum Repeaters and Networks Monterey, USA, 2015.
• Shota Nagayama, Clare Horsman, Austin Fowler and Rodney Van Meter. Surface Code Quantum Computation on a Defective Physical Lattice. JFLI meeting on quantum information and computation, Paris, French, March 5th, 2013.
• Shota Nagayama, Clare Horsman, Austin Fowler and Rodney Van Meter. Surface Code Quantum Computation on a Defective Physical Lattice. Quantum Error Correction 2011, Los Angeles, USA, Dec 2011.
• Shota Nagayama and Rodney Van Meter. Defective Qubits in Surface Code Quantum Computation on a Fixed Lattice. Asian Conference on Quantum Information Science 2010, Tokyo Univ. Japan, Aug 2010.
• Shota Nagayama and Rodney Van Meter. RaQoon2: Extension of Internet Key Exchange to Use Quantum Key Distribution. Updating Quantum Cryptography and Communications 2010 Japan, Nov 2010.
• Takahiko Satoh, Shota Nagayama and Rodney Van Meter. A reversible ternary adder for quantum computation. Asian Conference on Quantum Information Science 2010, Tokyo Univ. Japan, Aug 2007.

Theses

• Shota Nagayama. Doctoral dissertation, Distributed Quantum Computing Utilizing Multiple Codes on Imperfect Hardware. arXiv:1704.02620, Feb. 2017.
• Shota Nagayama. Master’s thesis, Surface code quantum computation on a defective physical lattice. Feb. 2012.
• Shota Nagayama. Bachelor’s thesis, 量子鍵配送を利用したIPsecのためのIKE拡張.
  http://www.sfc.wide.ad.jp/thesis/2009/bachelor/kurosagi-bachelor-thesis.pdf (in Japanese).
  English title: Modifying IKE for IPsec with Quantum Key Distribution. Feb. 2010.

Domestic Activities in Japan

White Papers

• Shota Nagayama, Rikizo Ikuta, Hideo Kosaka, Toshihiko Sasaki, Hiroki Takahashi, Kae Nemoto, Tomoyuki Horikiri, Rekishu Yamazaki, Takashi Yamamoto and Rodney Van Meter. The Quantum Internet - the ultimate cyberspace in the universe -. Feb. 2021. LINK in Japanese.

Invited Talks (Academic Conferences)

• 永山翔太. 量子通信のビジョン. 電子情報通信学会コミュニケーションシステム（CS）研究会. Jan. 2024.
• 永山翔太．量子通信システム．情報処理学会量子ソフトウェア研究会 発足記念講演会．Oct 2020．
• 永山翔太．量子インターネットの研究開発動向．応用物理学会 量子情報工学研究会 研究会 「量子技術ホライゾンー量子物理から量子インターネットを展望する」．Dec 2020．
• 永山翔太. 量子インターネット非物理レイヤー. 第40回量子情報技術研究会（QIT40）. May 2019.
• Shota Nagayama. 量子インターネット非物理レイヤー. The 40th Quantum Information Technology Symposium (QIT40). Fukuoka, Japan. May. 2019.

Invited Talks (Industrial Conferences and other meetings)

• 永山翔太ほか. 新技術を支えるインターネット基盤を考える. Internet Week 2023. Nov. 2023.
• 永山翔太. サイエンティフィックシステム研究会. Oct. 2023.
• 永山翔太. Q2B Tokyo. 2023/07/20.
• 永山翔太. ネットワーク化する量子コンピュータ. Interop Tokyo 2023　カンファレンス. 2023/06/15.
• 永山翔太. 量子コンピュータと量子インターネットの基本. Interop Tokyo 2023　展示会場内セミナー. 2023/06/14.
• 永山翔太. 講演　量子インターネットの可能性. 光産業技術振興協会　光ネットワーク産業・技術研究会. 2023/05/08.
• 永山翔太. 量子コンピュータ/量子インターネットの可能性と現状、そしてこれから. 関西オープンフォーラム. Nov. 2022.
• 永山翔太. 量子コンピューティングEXPO. Oct. 2022.
• 永山翔太. IT事業者が知っておきたい量子コンピュータ ～アプリケーション、量子超越性、量子クラウド、量子AI～ Interop Tokyo 2022. 2022/06/16.
• 永山翔太. 量子セキュリティ：矛と「盾」 Interop Tokyo 2022 カンファレンス. 2022/06/16.
• 永山翔太. IT業界人のための「これなら分かる、量子ネットワーク分類学. Interop Tokyo 2022. 2022/06/16.
• 永山 翔太. IT業界人のための「これなら分かる、量子コンピュータ分類学」. NOM ONLINE SEMINAR. 2022/06/01.
• 永山翔太．量子コンピュータと量子インターネットがある世界．クラウドカンファレンス．Sep 2021．
• 永山翔太．量子インターネットの目指す世界 ～欧米中の動向とユースケース～．株式会社新社会システム総合研究所セミナー．Aug 2021．
• 永山翔太．量子インターネットとは、その現状．SMBC投資家向けテーマセミナー．Aug 2021．
• 永山翔太. メルカリにおける量子情報研究. IPA量子コンピューティングシンポジウム. Tokyo, Japan. Mar. 2019.
• 永山翔太ほか. パネルディスカッション「研究開発の方向性」. https://qii.jp/. Nov. 2022.
• Shota Nagayama. Communication Technologies in the Age of Quantum Information: The Quantum Internet. Mercari Tech Conference 2018, Japan. Oct. 2018.

Talks in Symposiums

• Shota Nagayama. スケーラブルで強靭な統合的量子通信システム. ムーンショット目標6公開シンポジウム2024. 2024/03/25.
• Shota Nagayama. スケーラブルで強靭な統合的量子通信システム. ムーンショット目標６国際シンポジウム2023. 2023/07/19.
• Shota Nagayama. スケーラブルで強靭な統合的量子通信システム. ムーンショット目標6公開シンポジウム2023. 2023/03/28.

Contibutions to Books and other publications

• 永山翔太. 量子インターネット. 書籍「インターネット白書2024」, 株式会社インプレス. Feb. 2024.
• 永山翔太. 量子インターネットの基礎と今後の可能性. 書籍「量子技術の実用化と研究開発業務への導入方法」, 株式会社技術情報協会. Nov. 2022.
• 永山翔太. 量子インターネットの展望. 光エレクトロニクス技術専門誌「O plus E」, アドコム・メディア株式会社. 2022年9月・10月号.
• 永山翔太. 量子インターネットの基礎と今後の可能性. 研究開発リーダー, 株式会社技術情報協会. 2021年10月号.

Workshops, Conferences Without Proceedings and Posters

• 小林佳史，永山翔太. Rydberg原子量子コンピュータ上の表面符号における消失エラーの解析. 電子情報通信学会量子情報技術研究会（QIT）第29回. Dec. 2023.
• 永山翔太. 線形量子ネットワークにおけるエンドツーエンドの量子もつれ蒸留. IPSJ 量子ソフトウェア研究会. Mar. 2022.
• 久保健治，永山翔太. 変分量子計算による確率微分方程式のシミュレーション. 第1回量子ソフトウェア研究発表会. Oct. 2020.
• Kenji Kubo, Shota Nagayama. Applicability and Challenges of NISQ algorithm to Financial Derivative. The 41st Quantum Information Technology Symposium (QIT41). Tokyo, Japan. Nov. 2019.
• Takayuki Suzuki, Shota Nagayama. Analysis on Quantum Annealing Based on Quantum Master Equation. The 41st Quantum Information Technology Symposium (QIT41). Tokyo, Japan. Nov. 2019.
• Kanto, Teranishi, Shota Nagayama. Quantum Annealing for Minimum Cut of a Simple Graph. The 41st Quantum Information Technology Symposium (QIT41). Tokyo, Japan. Nov. 2019.
• Shota Nagayama, Clare Horsman, Austin Fowler and Rodney Van Meter. Surface code quantum computation on a defective lattice. FIRST Project Summer School, Okinawa, Japan. Jul. 2012.
• Shota Nagayama, Clare Horsman, Austin Fowler, and Rodney Van Meter. Surface code quantum computation on a defective lattice. FIRST All-Hands Meeting, Dec. 2011.
• Shota Nagayama and Rodney Van Meter. Defective Qubits in Surface Code Quantum Computation on a Fixed Lattice. FIRST Project Summer School, Okinawa, Japan. Aug. 2010.
• Shota Nagayama and Rodney Van Meter. Defective Qubits in Surface Code Quantum Computation on a Fixed Lattice. FIRST All-hands meeting, Kyoto, Japan. Dec. 2010.
• 永山翔太, 量子鍵配送を使ったIPsecのためのIKE拡張. Internet Conference 2009, Kyoto, Japan. Oct. 2009.

Committee and Working Group Reports

• Rodney Van Meter and Shota Nagayama for the WIDE AQUA group members, AQUA: Advancing Quantum Architecture Annual Report 2010
  WIDE Project working group report. Brief intro into “Why quantum?” and a snapshot of work going on not just at SFC but in the WIDE Project at large. Dec. 2010.

Tutorials and Seminars

• Shota Nagayama. Surface Code Quantum Computation. National Institute of Advanced Industrial Science and Technology(AIST) Nanoelectronics Research Institute. October 10th, 2019.
• Shota Nagayama. Fault-tolerant quantum computation and Quantum communication QCX2. August 7th, 2019.
• FIRST/Quantum Cybernetics/CREST Joint 1.5-day Surface Code Quantum Error Correction Tutorial/Workshop. Feb. 23-24, 2011.

Other Presentations

• 永山翔太. Quantum Network Project in Japan. ミニワークショップ@OIST, Elkouss グループ. 2022/11/09.
• Heterogeneously encoded Bell pairs. Ritsumeikan University, Shiga, Japan. Jul. 2015.
• Surface Code Quantum Computation on a Defective Physical Lattice. Georgia Institute of Technology. Feb. 2013.
• Surface Code Quantum Computation on a Defective Physical Lattice. Kyoto. Jan. 2013.
• Shota Nagayama, “Surface Code Quantum Computation on a Defective Physical Lattice”, Microsoft Research, February 15, 2012.
• Surface code on defective lattice, The University of Melbourne. Apr. 2011.
• IPsec with QKD, WIDE Camp Spring 2009. Mar. 2009.

Patents

Holds three patents in quantum information technology.