Koji Enbutsu

2.0k total citations · 2 hit papers
74 papers, 1.3k citations indexed

About

Koji Enbutsu is a scholar working on Electrical and Electronic Engineering, Atomic and Molecular Physics, and Optics and Artificial Intelligence. According to data from OpenAlex, Koji Enbutsu has authored 74 papers receiving a total of 1.3k indexed citations (citations by other indexed papers that have themselves been cited), including 65 papers in Electrical and Electronic Engineering, 29 papers in Atomic and Molecular Physics, and Optics and 10 papers in Artificial Intelligence. Recurrent topics in Koji Enbutsu's work include Optical Network Technologies (46 papers), Photonic and Optical Devices (44 papers) and Advanced Photonic Communication Systems (40 papers). Koji Enbutsu is often cited by papers focused on Optical Network Technologies (46 papers), Photonic and Optical Devices (44 papers) and Advanced Photonic Communication Systems (40 papers). Koji Enbutsu collaborates with scholars based in Japan, United States and Netherlands. Koji Enbutsu's co-authors include Takeshi Umeki, Takushi Kazama, Hiroki Takesue, Takahiro Inagaki, Toshimori Honjo, Ken‐ichi Kawarabayashi, Tomohiro Sonobe, Hirokazu Takenouchi, Ryoichi Kasahara and O. Tadanaga and has published in prestigious journals such as Science, Nature Communications and Applied Physics Letters.

In The Last Decade

Koji Enbutsu

67 papers receiving 1.3k citations

Hit Papers

align trajectories

What are hit papers?

Hit papers significantly outperform the citation benchmark for their cohort. A paper qualifies if it has ≥500 total citations, achieves ≥1.5× the top-1% citation threshold for papers in the same subfield and year (this is the minimum needed to enter the top 1%, not the average within it), or reaches the top citation threshold in at least one of its specific research topics.

A coherent Ising machine for 2000-node optimization problems

2016 495 citations Takahiro Inagaki, Koji Igarashi et al. profile →
100,000-spin coherent Ising machine

2021 194 citations Toshimori Honjo, Kensuke Inaba et al. Science Advances profile →

Peers — A (Enhanced Table)

Peers by citation overlap · career bar shows stage (early→late) cites · hero ref

Name	h						Papers	Cites
Koji Enbutsu Japan	15	740	719	371	89	81	74	1.3k
Toshiyuki Miyazawa Japan	12	491 0.7×	509 0.7×	508 1.4×	112 1.3×	66 0.8×	28	960
Takeshi Umeki Japan	24	1.4k 2.0×	799 1.1×	884 2.4×	89 1.0×	86 1.1×	155	2.2k
Hirokazu Takenouchi Japan	20	1.2k 1.7×	446 0.6×	575 1.5×	61 0.7×	95 1.2×	98	1.6k
Christoph Pacher Austria	16	305 0.4×	592 0.8×	560 1.5×	47 0.5×	65 0.8×	53	969
Ryan Hamerly United States	22	1.3k 1.8×	1.6k 2.2×	649 1.7×	70 0.8×	89 1.1×	68	2.1k
Shuhei Tamate Japan	12	446 0.6×	1.0k 1.4×	433 1.2×	121 1.4×	103 1.3×	27	1.3k
Koji Igarashi Japan	22	1.5k 2.1×	441 0.6×	387 1.0×	63 0.7×	75 0.9×	112	1.9k
Shoko Utsunomiya Japan	15	579 0.8×	1.2k 1.7×	930 2.5×	144 1.6×	138 1.7×	26	2.0k
Yoshitaka Haribara Japan	4	423 0.6×	832 1.2×	241 0.6×	123 1.4×	104 1.3×	6	1.0k
Hayato Goto Japan	18	221 0.3×	1.0k 1.4×	647 1.7×	158 1.8×	91 1.1×	69	1.4k

Countries citing papers authored by Koji Enbutsu

Since Specialization

Citations

This map shows the geographic impact of Koji Enbutsu's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by Koji Enbutsu with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Koji Enbutsu more than expected).

Fields of papers citing papers by Koji Enbutsu

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Koji Enbutsu. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by Koji Enbutsu. The network helps show where Koji Enbutsu may publish in the future.

Co-authorship network of co-authors of Koji Enbutsu

This figure shows the co-authorship network connecting the top 25 collaborators of Koji Enbutsu. A scholar is included among the top collaborators of Koji Enbutsu based on the total number of citations received by their joint publications. Widths of edges represent the number of papers authors have co-authored together. Node borders signify the number of papers an author published with Koji Enbutsu. Koji Enbutsu is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

Sort: Min cites: Since: Top N: Style:

20 of 20 papers shown

Abe, Masashi, Shimpei Shimizu, Takushi Kazama, et al.. (2025). Periodically Poled Lithium-niobate-based Wavelength Converters for Waveband Extension to U-Band and Beyond. Journal of Lightwave Technology. 43(13). 6335–6341.

Shimizu, Shimpei, Takayuki Kobayashi, Takushi Kazama, et al.. (2024). Hybrid Lumped Repeater Using PPLN-Based High-Gain Optical Parametric Phase Conjugators and EDFAs for C+L-Band Transmission. Journal of Lightwave Technology. 42(10). 3580–3591. 4 indexed citations

Kashiwazaki, Takahiro, Takushi Kazama, Koji Enbutsu, et al.. (2023). Toward a multi-core ultra-fast optical quantum processor: 43-GHz bandwidth real-time amplitude measurement of 5-dB squeezed light using modularized optical parametric amplifier with 5G technology. Applied Physics Letters. 122(10). 27 indexed citations

Inaba, Kensuke, Takahiro Inagaki, Yasuhiro Yamada, et al.. (2023). Experimental observation of chimera states in spiking neural networks based on degenerate optical parametric oscillators. Communications Physics. 6(1). 7 indexed citations

Nakagawa, Masahiro, Takeshi Seki, Shimpei Shimizu, et al.. (2023). Experimental Demonstration of Cascadable PPLN-Based Inter-Band Wavelength Converters for Band-Switchable Multi-Band Optical Cross-Connect. M4G.1–M4G.1. 4 indexed citations

Takesue, Hiroki, Yasuhiro Yamada, Kensuke Inaba, et al.. (2023). Observing a Phase Transition in a Coherent Ising Machine. Physical Review Applied. 19(3). 7 indexed citations

Shimizu, Shimpei, Takayuki Kobayashi, Takushi Kazama, et al.. (2023). Wideband Optical Parametric Amplification of 8.375-THz WDM Signal Using Cascaded PPLN Waveguides With Reused Pump Light. Journal of Lightwave Technology. 41(24). 7399–7407. 1 indexed citations

Kashiwazaki, Takahiro, Koji Enbutsu, Takushi Kazama, et al.. (2023). Over-8-dB squeezed light generation by a broadband waveguide optical parametric amplifier toward fault-tolerant ultra-fast quantum computers. Applied Physics Letters. 122(23). 24 indexed citations

Shimizu, Shimpei, Takayuki Kobayashi, Akira Kawai, et al.. (2023). L- and U-Band WDM Transmission Over 6 THz Using PPLN-Based Optical Parametric Amplification and Wavelength-Band Conversion. Journal of Lightwave Technology. 42(5). 1347–1355. 9 indexed citations

10.

Inaba, Kensuke, Takahiro Inagaki, Koji Igarashi, et al.. (2022). Potts model solver based on hybrid physical and digital architecture. Communications Physics. 5(1). 13 indexed citations

11.

Shimizu, Shimpei, Takayuki Kobayashi, Takushi Kazama, et al.. (2022). PPLN-Based Optical Parametric Amplification for Wideband WDM Transmission. Journal of Lightwave Technology. 40(11). 3374–3384. 31 indexed citations

12.

Takase, Kan, Takahiro Kashiwazaki, Takushi Kazama, et al.. (2022). Quantum arbitrary waveform generator. Science Advances. 8(43). eadd4019–eadd4019. 9 indexed citations

13.

Takase, Kan, Mamoru Endo, Takahiro Kashiwazaki, et al.. (2022). Generation of Schrödinger cat states with Wigner negativity using a continuous-wave low-loss waveguide optical parametric amplifier. Optics Express. 30(9). 14161–14161. 23 indexed citations

14.

Kazama, Takushi, Takeshi Umeki, Shimpei Shimizu, et al.. (2021). Over-30-dB gain and 1-dB noise figure phase-sensitive amplification using a pump-combiner-integrated fiber I/O PPLN module. Optics Express. 29(18). 28824–28824. 31 indexed citations

15.

Ikuta, Takuya, Takahiro Inagaki, Kensuke Inaba, et al.. (2020). Continuous and long-term stabilization of degenerate optical parametric oscillators for large-scale optical hybrid computers. Optics Express. 28(26). 38553–38553. 2 indexed citations

16.

Umeki, Takeshi, Takushi Kazama, Takayuki Kobayashi, et al.. (2019). Low-noise Amplification and Nonlinearity Mitigation Based on Parametric Repeater Technology. NTT technical review. 17(5). 20–26. 3 indexed citations

17.

Umeki, Takeshi, O. Tadanaga, Takushi Kazama, et al.. (2016). Advances in Phase Sensitive Amplifiers Based on PPLN Waveguides for Optical Communication. NTT technical review. 14(1). 25–30. 2 indexed citations

18.

Enbutsu, Koji, et al.. (2009). Novel optical fiber identification method for PONs based on polarization modulation caused by pressure-induced retardation. European Conference on Optical Communication. 1–2. 1 indexed citations

19.

Enbutsu, Koji, et al.. (2005). Low driving voltage optical switch module with KTN waveguides. IEICE Technical Report; IEICE Tech. Rep.. 105(27). 33–38. 1 indexed citations

20.

Usui, Mitsuo, Nobuo Sato, Akira Ohki, et al.. (2000). A New Optical Interface Structure for Parallel Optical Interconnect Module. IEICE Transactions on Electronics. 83(9). 1447–1457. 1 indexed citations

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

Explore authors with similar magnitude of impact