Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, Computer Vision and Pattern Recognition, Artificial Intelligence
37
Scopus Publications
941
Scholar Citations
17
Scholar h-index
30
Scholar i10-index
Scopus Publications
A Quadratic Unconstrained Binary Optimization (QUBO) Model for Elevation-Aware Vehicle Routing: Optimizing Fuel Consumption and Traffic Congestion Tsubasa Suzuki, Takao Tomono Advanced Quantum Technologies, 2026 This study formulates a novel, elevation‐aware Quadratic Unconstrained Binary Optimization (QUBO) model for multi‐vehicle route optimization that simultaneously reduces fuel consumption and traffic congestion. Candidate routes are generated using a gradient‐corrected Dijkstra algorithm, and route selection is optimized by minimizing a rigorously constructed QUBO Hamiltonian that incorporates fuel cost, route overlap, and constraint satisfaction. Extensive numerical validation is performed using classical annealing simulations across multiple regions with diverse topographical and road network characteristics, including San Francisco. The results demonstrate that incorporating elevation information significantly reduces fuel consumption, while the proposed overlap penalty effectively mitigates congestion. A clear trade‐off between overlap reduction and fuel efficiency is quantitatively characterized. The mathematical consistency of the formulation is ensured through a theoretically derived penalty coefficient, which guarantees constraint satisfaction and stable optimization behavior. Scaling experiments further reveal the limitations of classical solvers as the number of candidate routes increases, highlighting the importance of robust QUBO formulations and motivating future implementation on quantum processing units. Overall, this work establishes a validated and theoretically sound QUBO framework for sustainable transportation optimization and provides a reliable performance baseline for future quantum hardware–based investigations.
Genetic-multi-initial generalized VQE: Advanced VQE method using genetic algorithms then local search Hikaru Wakaura, Takao Tomono International Journal of Quantum Information, 2026 Variational-Quantum-Eigensolver(VQE) method has been known as chemical calculation using quantum computers and classical computers. This method also can derive the energy levels of excited states by Variational-Quantum-Deflation(VQD) method. Although the parameter landscape of the excited state has many local minimums, the results tend to be trapped by them. Therefore, we apply Genetic Algorithms and then Local Search (GA then LS) as the classical optimizer of the VQE method. We calculated ground and excited states and their energies on hydrogen molecules by modifying GA then LS. Here, we used Powell, Broyden–Fletcher–Goldferb–Shanno, Nelder–Mead and Newton’s method as an optimizer of LS. We obtained that Newton’s method can derive ground and excited states of hydrogen and helium hydride molecules and their energies with higher accuracy than others.
FPT-EMS: An FPGA Implementation Using NB-LDPC Code for Continuous-Variable Quantum Key Distribution Kaijie Wei, Devanshu Garg, Ryutaro Nagai, Takao Tomono, Hideharu Amano Proceedings of the 15th International Symposium on Highly Efficient Accelerators and Reconfigurable Technologies Heart 2025, 2025 The Continuous-Variable Quantum Key Distribution (CV-QKD) is a groundbreaking technology that enables two parties, Alice and Bob, to share secret cryptographic keys with security guaranteed by the fundamental principle of quantum mechanics. The optical signal’s amplitude and phase quadratures are transmitted through a quantum channel and measured by the receiver (Bob). Due to channel noise, loss, and other imperfections, error correction is necessary to ensure both parties share identical raw key bits while minimizing information leakage to potential eavesdroppers (Eve). Non-Binary Low-Density Parity-Check (NB-LDPC) codes are well-suited for CV-QKD because they achieve high reconciliation efficiency, particularly in low-SNR scenarios. However, the intensive computational complexity hinders its further deployment in real-world applications. In this paper, we present an HLS-based decoder system, FPT-EMS (Field-Programmable T-EMS), which consists of six submodules aligning with the construction of the base design, Trellis-Based Extended Min-Sum (T-EMS). After the dedicated design of each submodule considering algorithm properties and FPGA characteristics, we ultimately achieved a 9.36 × speedup compared with ARM cores of the target platform, RFSoC 4x2, at the throughput of 0.89 Mbps over one iteration.
Tensor Network-Based Continuous Variable Quantum Circuit Optimization for Preparation of GKP State Ryutaro Nagai, Takao Tomono Proceedings 2023 IEEE International Conference on Quantum Computing and Engineering Qce 2023, 2023 Tensor networks are highly promising methods for efficiently simulating quantum systems using classical computers. In recent years, the efficiency of tensor networks has been eagerly harnessed to simulate NISQ devices in the era of quantum supremacy. However, as of now, quantum advantage with NISQ devices has not been clearly demonstrated in practical applications. This provide impetus for us to intensify our effort in fault tolerant quantum computation (FTQC). Various physical systems and schemes for FTQC have been proposed, with GKP encoding in bosonic systems being one such example. The preparation of GKP states serves as an important building block for realizing FTQC with the GKP code. We introduce tensor networks for simulating and optimizing the GKP state preparation circuit. It is known that the generation of approximated GKP states is achievable through photon counting and post-selection applied to properly prepared multimode Gaussian states. However, it requires optimization of numerous circuit parameters, which is typically computationally challenging on classical computers due to the involvement of the photon counting measurement process. We attempt to utilize tensor networks for more efficient parameter optimization. Additionally, we explore further efficient approach in terms of tensor network structure. We propose a multi-cutoff dimension approach combined with a tree tensor network structure.
Autostereoscopic display with eye tracking Takao Tomono, Kyung Hoon, Yong Soo Ha, Sung-Sik Kim, Jung-Young Son Proceedings of SPIE the International Society for Optical Engineering, 2002
Phase-matched second-harmonic generation in poled polymer waveguide based on poly(methylmethacrylate) doped with cyclobutenedione derivative Molecular Crystals and Liquid Crystals Science and Technology Section B Nonlinear Optics, 1992
A Quadratic Unconstrained Binary Optimization (QUBO) Model for Elevation‐Aware Vehicle Routing: Optimizing Fuel Consumption and Traffic Congestion T Suzuki, T Tomono Advanced Quantum Technologies 9 (2), e00660 , 2026 2026
Genetic-multi-initial generalized VQE: Advanced VQE method using genetic algorithms then local search H Wakaura, T Tomono International Journal of Quantum Information, 2550038 , 2025 2025
FP-FBEMS: FPGA-Based Optimization of Forward/Backward EMS Decoding for CV-QKD K Wei, D Garg, R Nagai, T Tomono, H Amano 2025 IEEE 18th International Symposium on Embedded Multicore/Many-core … , 2025 2025
The discriminative ability on anomaly detection using quantum kernels for shipping inspection T Tomono, K Tsujimura EPJ Quantum Technology 12 (1), 36 , 2025 2025 Citations: 9
3D Optical Switch for Quantum Communication T Tomono, R Yamaguchi 2025 IEEE Photonics Conference (IPC), 1-2 , 2025 2025
Leveraging Quantum Feature Spaces for Industrial Time-Series Anomaly Detection T Tomono, K Tsujimura 2025 IEEE International Conference on Quantum Artificial Intelligence (QAI … , 2025 2025
Overview of AI Map β-Overview of AI Technologies and AI Problems: for Beginners and Practitioners in AI Research F Tsutsumi, K Morikawa, R Ichise, K Ueno, T Yoshioka, T Tomono New Generation Computing 43 (4), 15 , 2025 2025 Citations: 1
Quantum navigation system considering the fuel consumption due to elevation difference T Suzuki, T Tomono 2025 5th International Conference on Electrical, Computer, Communications … , 2025 2025
Potential of multi-anomalies detection using quantum machine learning T Tomono, K Tsujimura arXiv preprint arXiv:2510.07055 , 2025 2025 Citations: 1
Quantum Kernel Anomaly Detection Using AR-Derived Features from Non-Contact Acoustic Monitoring for Smart Manufacturing T Tomono, K Tsujimura 2025 IEEE International Conference on Quantum Computing and Engineering (QCE … , 2025 2025 Citations: 1
Fpt-ems: an fpga implementation using nb-ldpc code for continuous-variable quantum key distribution K Wei, D Garg, R Nagai, T Tomono, H Amano Proceedings of the 15th international symposium on highly efficient … , 2025 2025 Citations: 2
Quantum Optimization-Based Route Compression for Efficient Navigation Systems S Sotobayashi, Y Minato, T Tomono arXiv preprint arXiv:2504.03227 , 2025 2025
Quantum kernel learning Model constructed with small data T Tomono, K Tsujimura arXiv preprint arXiv:2412.00783 , 2024 2024 Citations: 2
Liquid crystal waveguide film and its application to smart glasses T Tomono, R Yamaguchi Discover Electronics 1 (1), 6 , 2024 2024 Citations: 1
Discover Electronics T Tomono, R Yamaguchi 2024
Tensor network-based continuous variable quantum circuit optimization for preparation of GKP state R Nagai, T Tomono 2023 IEEE International Conference on Quantum Computing and Engineering (QCE … , 2023 2023
Quantum kernels for difficult visual discrimination T Tomono, K Tsujimura, T Godo 2023 IEEE International Conference on Quantum Computing and Engineering (QCE … , 2023 2023 Citations: 3
Shipping inspection trial of quantum machine learning toward sustainable quantum factory T Tomono, S Natsubori PHM Society Asia-Pacific Conference 4 (1) , 2023 2023 Citations: 8
AI 課題マップと AI マップのビジネス応用 吉岡健， 友野孝夫 人工知能 38 (4), 529-538 , 2023 2023
Three-dimensional image display apparatus T Tomono US Patent 6,943,788 , 2005 2005 Citations: 86
Micro-needle and micro-needle patch T Tomono US Patent App. 12/081,592 , 2008 2008 Citations: 75
Head-mounted display T Tomono US Patent 6,751,026 , 2004 2004 Citations: 66
Method of forming colored film, driving device and liquid crystal display device E Akutsu, S Ohtsu, T Tomono, K Shimizu US Patent 6,344,301 , 2002 2002 Citations: 46
Microneedle array and method for producing microneedle array T Tomono US Patent App. 12/453,783 , 2009 2009 Citations: 44
Micro-needle and micro-needle patch T Tomono US Patent App. 12/081,601 , 2008 2008 Citations: 39
2D/3D convertible display T Tomono US Patent App. 10/238,886 , 2003 2003 Citations: 31
Method of manufacturing microneedle H Sugimura, G Suzuki, M Ueno, Y Kodama, T Tomono US Patent 7,789,733 , 2010 2010 Citations: 30
Proposal of a near-field optical head using a new solid immersion mirror K Ueyanagi, T Tomono Japanese Journal of Applied Physics 39 (2S), 888 , 2000 2000 Citations: 30
Self-frequency-doubler laser element T Tomono, T Nishikata, LS Pu, K Sasaki US Patent 5,390,201 , 1995 1995 Citations: 27
Method of manufacturing a thin film transistor-integrated color filter S Ohtsu, K Shimizu, E Akutsu, T Tomono US Patent 6,503,772 , 2003 2003 Citations: 26
A new way to control the internal structure of microneedles: a case of chitosan lactate T Tomono Materials Today Chemistry 13, 79-87 , 2019 2019 Citations: 25
Micro-needle and micro-needle patch T Tomono US Patent App. 12/458,836 , 2009 2009 Citations: 25
Head-mounted display T Tomono US Patent 6,963,379 , 2005 2005 Citations: 24
Thin-film semiconductor device with field plate I Asai, T Tomono, T Nakamura US Patent 5,367,180 , 1994 1994 Citations: 23
Performance of quantum kernel on initial learning process T Tomono, S Natsubori EPJ Quantum Technology 9 (1), 35 , 2022 2022 Citations: 22
Method of manufacturing microneedle K Shiomitsu, H Sugimura, T Kurosu, G Suzuki, T Tomono US Patent App. 12/318,629 , 2009 2009 Citations: 21
Method of manufacturing master plate, method of manufacturing microneedle patch and apparatus exposure apparatus T Tomono US Patent 8,062,835 , 2011 2011 Citations: 17
Puncture performance of sharpen microneedles by using inclined contact UV lithography T Tomono Microsystem Technologies 24 (9), 3589-3599 , 2018 2018 Citations: 14
Method for producing color filter using photocatalysis, apparatus for producing color filter S Ohtsu, T Tomono, K Shimizu, E Akutsu US Patent 6,613,486 , 2003 2003 Citations: 14
