@Kiyoshi Tamaki


Born 1975 in Fukuoka, Japan, Kiyoshi Tamaki got his M.Sc. and diploma in theoretical physics at Tokyo Institute of Technology in Japan. From April 2001 to March 2004, he was a Ph.D student supervised by Prof. Masato Koashi at Prof. Nobuyuki Imoto's group in the Graduate University for Advanced Studies (SOKENDAI), Japan. During his Ph.D, he visited Prof. Norbert Luetkenhaus's group at the University Erlangen-Nuremberg in Germany for half a year. After obtaining his Ph.D degree, he worked at the Perimeter Institute for Theoretical Physics in Canada, under a support of Dr. Daniel Gottesman, and then he moved to the University of Toronto as a postdoctoral fellow to work for Prof. Hoi-Kwong Lo. In January 2006 he joined NTT basic research laboratories in Japan as a scientific researcher. Since April 2017, he has been working for the Faculty of Engineering of University of Toyama as a professor.


Main research interest

I am interested in quantum communication, in particular security of quantum key distribution (QKD). One of the most attractive features of QKD is that it is secre against any possible eavesdropping. Importantly, such an ultimate security can be achieved only if the legitimate users' QKD devices satisfy all the requirements imposed by security proofs of QKD. Unfortunately, however, due to unavoidable imperfections, such as noises, or/and side-channel attacks, there is a gap between the theoretically ideal devices and practical devices. Therefore, filling this gap is indispensable to establish practical security of QKD, i.e. implementation security of QKD, and this is exactly what I have been mainly working for these years.


Selected recent papers

"Decoy-state quantum key distribution with a leaky source", K. Tamaki, M. Curty, and M. Lucamarini, New Journal of Physics, 18, 065008 (2016).

"All photonic quantum repeaters", K. Azuma, K. Tamaki, and H.-K. Lo, Nature Communications 6:6787 (2015).

"Secure Quantum Key Distribution", H.-K. Lo, M. Curty, and K. Tamaki, Nature Photonics 8, 595-604 (2014) (Review article).

"Loss-tolerant quantum cryptography with imperfect sources", K. Tamaki, M. Curty, G. Kato, H.-K. Lo, and K. Azuma, Phys. Rev. A 90, 052314 (2014).

Full publication list (partially in Japanese)



Contact information

tamaki [at] eng.u-toyama.ac.jp