Quantum Communication for the Ultimate Capacity and Security
Quantum info-communication technologies (Q-ICT) will be able to realize quantum communication which attains higher capacity than that of conventional optical communications, and the unconditionally secure communication, known as quantum key distribution (QKD), that cannot be broken by any future technologies. In this article we first review a brief history of Q-ICT, and introduce basic notions and results so far. We then present our recent results on these two technologies, addressing current limitations of the known schemes, and finally discuss future perspectives, especially a challenge to merge the merits of the two.
KeywordsQuantum communication Quantum receiver Quantum key distribution Physical layer cryptography
The results on QKD presented here were obtained by the collaboration with NEC Corporation under the NICT Commissioned Research. This work was partly supported by the Quantum Information Processing Project in the Program for World-Leading Innovation Research and Development on Science and Technology (FIRST) and by a National Research Foundation of Korea (NRF) grant funded by the Korean Government (Ministry of Education, Science, and Technology) (No. 2010-0018295).
- 1.C.E. Shannon, A mathematical theory of communication. Bell Syst. Tech. J. 27, 379–423 (Part I); 623–656 (Part II) (1948)Google Scholar
- 5.C.H. Bennett, G. Brassard, Quantum cryptography: public key distribution and coin tossing, in Proceedings of the IEEE International Conference on Computers Systems and Signal Processing, Bangalore (1984), pp. 175–179Google Scholar
- 14.J.P. Gordon, Noise at optical frequencies; information theory, in Quantum Electronics and Coherent Light, ed. by P.A. Miles. Proceedings of the International School of Physics “Enrico Fermi”, Course XXXI (Academic, New York, 1964), pp. 156–181Google Scholar
- 15.C. Elliott, A. Colvin, D. Pearson, O. Pikalo, J. Schlafer, H. Yeh, Current status of the DARPA quantum network, in Quantum Information and Computation III, ed. by E.J. Donkor, A.R. Pirich, H.E. Brandt. Proceedings of SPIE, vol. 5815 (2005), pp. 138–149. arXiv:quant-ph/0503058v2Google Scholar
- 20.R.S. Kennedy, Near-optimum receiver for the binary coherent state quantum channel. Res. Lab Electron. MIT Q. Progress Rep. 108, 219 (1973)Google Scholar
- 21.S. Dolinar, An optimum receiver for the binary coherent state quantum channel. Res. Lab Electron. MIT Q. Progress Rep. 111, 115 (1973)Google Scholar
- 22.A.S. Holevo, Quantum-probabilistic analysis of counting statistics with an application to the “Dolinar receiver”. Izv. Vuz. Mat. 26, 3 (1982) [Sov. Math. Dolk. 26, 3 (1982)]Google Scholar
- 33.F.E. Becerra, J. Fan, Baumgartner, S.V.G. Polyakov, J. Goldhar, J.T. Kosloski, A. Migdall, M-ary-state phase-shift-keying discrimination below the homodyne limit. Phys. Rev. A 84, 062324 (2011)Google Scholar
- 40.D. Ivanovic, How to differentiate between non-orthogonal states. Phys. Lett. A 123, 257 (1987); D. Dieks, Overlap and distinguishability of quantum states. Phys. Lett. A 126, 303 (1988); A. Peres, How to differentiate between non-otrhogonal states. Phys. Lett. A 128, 19 (1988)Google Scholar
- 52.T.-S. Han, H. Endo, M. Sasaki, Reliability and security functions of the wiretap channel under cost constraint. arXiv:1307.0608 [cs.IT]Google Scholar