133 citations · 171 across the 10 of their papers we have counts for
10 papers
Quantum estimation theory with quantum noise control
Osamu Hirota, Masaki Sohma
Quantum estimation theory serves as one of fundamental backbones of quantum Shannon information theory and was mathematically systematized by pioneers of quantum information scienc…
An improvement of optical PPM communication with high security
Osamu Hirota, Masaki Sohma
The purpose of this paper is to celebrate Sir D. Payne's 80th birthday by dedicating our latest results as a continuation of his work in optical communications. One of the importan…
Masking Property of Quantum Random Cipher with Phase Mask Encryption -Towards Quantum Enigma Cipher-
Masaki Sohma, Osamu Hirota
The security analysis of physical encryption protocol based on coherent pulse position modulation(CPPM) originated by Yuen is one of the most interesting topics in the study of cry…
Coherent pulse position modulation quantum cipher supported by secret key
Masaki Sohma, Osamu Hirota
A quantum cipher supported by a secret key so called keyed communication in quantum noise (KCQ) is very attractive in implementing high speed key generation and secure data transmi…
Quantum stream cipher by Yuen 2000 protocol: Design and experiment by intensity modulation scheme
Osamu Hirota, Masaki Sohma, Masaru Fuse +1
This paper shall investigate Yuen protocol, so called Y-00, which can realize a randomized stream cipher with high bit rate(Gbps) for long distance(several hundreds km). The random…
A quantum symmetric key cipher(Y-00) and key generation (Quantum stream cipher-Part II)
Osamu Hirota, Kentaro Kato, Masaki Sohma +1
What obstructs the realization of useful quantum cryptography is single photon scheme, or entanglement which is not applicable to the current infrastructure of optical communicatio…