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Ishikawa Lab (Wireless Network Lab)
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A lab that proposes new ideas built around wireless communications and quantum computing.
AboutAbout the lab
Connecting wireless communications and quantum computing
Ishikawa Lab conducts research on wireless communications and quantum computing.
Its main areas are high-speed mobile communications and applications of quantum computing to communications.
The lab studies quantum optimization for wireless communications, post-quantum physical layer security, and communication schemes that deliver high performance with low computational complexity.
Faculty members have backgrounds in both communications engineering and information engineering, so research themes can be set relatively flexibly.
Key terms
- Grover adaptive search
- A method in quantum computing for searching for candidate answers. Its quantum speedup has been theoretically proven
- Physical layer
- The lowest layer in a communication system, which actually delivers signals by radio waves and other means. The lab also studies how to enhance security at this layer
- Non-square differential coding
- A technique original to Ishikawa Lab. It is expected to improve the performance of millimeter-wave communications, but it also has challenges such as error propagation
NewsLab news
A master's student's paper has been accepted for publication in IEEE Wireless Communications Letters
An undergraduate student received the IEEE VTS Tokyo/Japan Chapter 2026 Young Researcher's Encouragement Award
A master's student's paper has been accepted for publication in IEEE Open Journal of the Communications Society
Master's and undergraduate students received the IEEE VTS Tokyo/Japan Chapter 2026 Young Researcher's Encouragement Award
A master's student's paper has been accepted for publication in IEEE Open Journal of the Communications Society
ResearchResearch themes
With both wireless communications and quantum computing as its core, the lab works on high-speed mobile communications and the application of quantum computing to communications. It aims to propose new ideas and publish papers through analyzing them.
*Illustrative imageQuantum optimization for wireless communications
The lab focuses on Grover adaptive search, whose quantum speedup has been theoretically proven, and tests whether some wireless signal processing and wireless optimization problems can be solved with quantum computing. Wireless signal processing and quantum circuits have mathematically similar structures.
*Illustrative imagePost-quantum physical layer security
Quantum algorithms can solve prime factorization in polynomial time, which threatens the security of RSA encryption, although on real hardware this is still limited to small integers. The lab studies techniques that use true random numbers extracted from wireless channels to strengthen security at the physical layer as well.
*Illustrative imageMaking communications comfortable during high-speed movement
When a device moves fast on a bus, train, Shinkansen, airplane, or drone, abrupt changes in how radio waves propagate and the Doppler effect degrade communication quality. To mitigate this problem, the lab studies its own original technique called non-square differential coding.
*Illustrative imageLightweight yet high-performance wireless communication technology
In general, there is a trade-off between the computational complexity and the performance of a communication scheme. Using mathematical optimization and machine learning techniques, the lab clarifies the performance limits achievable under certain constraints, while exploring schemes that reduce computational complexity and still achieve high performance.
MembersFaculty
Ishikawa Lab consists of faculty members, doctoral, master's, and undergraduate students, and a secretary.As of 2026
- Associate ProfessorNaoki Ishikawa
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “base station and antenna by Wireless City Planning” Yoh-Plus / CC BY 4.0 (cropped)
- Quantum optimization for wireless communications: “Drawing of Marconi Poldhu wireless station 1901” Jonathan Adolf Wilhelm Zenneck / Public domain (cropped)
- Post-quantum physical layer security: “Wi-fi router” Solijon Solayev / CC BY-SA 4.0 (cropped)
- Making communications comfortable during high-speed movement: “Belyi Krechet russian high-speed train concept 01” Zac Allan / CC BY-SA 4.0 (cropped)
- Lightweight yet high-performance wireless communication technology: “RFID IoT device 01” Vijka / CC BY 4.0 (cropped)
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- Related lab (Arakawa Lab (Semiconductor Photonics Engineering Lab)): “Laser diode with case cut away” Arconsoli / CC BY-SA 4.0 (cropped)
- Related lab (Obara Lab (Power Electronics Lab)): “Inverter Fronius = Sunways NT 6000-01ASD” Asurnipal / CC BY-SA 4.0 (cropped)
- Related lab (Ke Lab (Semiconductor Electronic Devices Lab)): “IRFI9540 MOS transistor 02” Retired electrician / CC0 (cropped)
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