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Graduate School of Science and Engineering
Information and Computer Science

Laboratory for Information Theory and its Applications

Website of the Laboratory (In Japanese)

We invite you to join us to do research and development on high-speed, reliable, and secure communications.




Telephone : +81-774-65-6295

Office : YE-215
Database of Researchers
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Tomotaka KIMURA
[Assistant Professor]

Telephone : +81-774-65-6294

Office : YE-214
Database of Researchers

Research Topics

1.Coding for multiple-access channel
2.Coding for MIMO systems
3.Adaptive signal processing for wireless communications
4.Channel coding and wireless communications
5.Relationship between quantum error-correction and state discrimination
6.Quantum uncertainty relation with classical information
7.Security analysis of quantum key distributions

Research Contents

Information theory, coding theory, communication theory, and cryptography are fundamentals in constructing modern information network. Based on these basic theories, we do research and development on information transmission, with particular attention to reliable communications with channel coding and secure communications with quantum cryptography. We expect this focus to bring new and important scientific and applied knowledge to information transmission.

[high-speed and reliable communications]: channel coding and decoding algorithms for wireless communication systems

In wireless communication systems, channel noise and interference would result in the unreliable information transmission. The interference, for example, in multiuser communication systems, is due to that multiple users share a common channel. In multiple-input multiple-output (MIMO) communication systems, the interference occurs due to simultaneous transmission from multiple antennas. Shannon’s coding theorem shows that the reliable information transmission is possible if the transmission rate is less than the channel capacity. We focus on the channel coding to realize the reliable information transmission in multiuser communication systems and MIMO systems. We aims high-reliable coding schemes and low-complexity decoding algorithms with the transmission rate approaching the theoretic limit. We will publish the results in leading international journals and conferences, and will transfer results from recent research in these areas to industry in mobile communications, wireless LAN, and satellite communications.

[high-speed and secure communications]: Quantum cryptography and quantum communications

Much attention is being paid to applied technologies of quantum information theory, the discipline of information science based on quantum mechanics. Quantum cryptography guarantees unconditional security. In quantum communications, quantum correlation is used to enable quantum teleportation and communication with super-dense coding, which are considered impossible with the existing techniques. Our research team focuses on analyzing security of quantum cryptography and improving its encryption capabilities, and analyzing and enhancing transmission efficiency of quantum communication. We also study the fundamentals of quantum information theory with a view to developing novel applied technologies.


  • Error-correcting code
  • Signal processing
  • Wireless communications
  • Quantum error-correction

  • State discrimination
  • Uncertainty relation
  • Quantum key distribution