518 citations · 1.1k across the 29 of their papers we have counts for
4 papers · 1 filter
The most robust entangled state of light
S. J. van Enk, O. Hirota
We study how photon absorption losses degrade the bipartite entanglement of entangled states of light. We consider two questions: (i) what state contains the smallest average numbe…
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…
Continuous variable noise-free states in correlated quantum noisy channels
Tohya Hiroshima, Osamu Hirota
We explicitly compute the evolution of the density operator of a two-mode electromagnetic field when the influence of the thermal fluctuation of the vacuum is common for both modes…
Quantum stream cipher based on optical communications
Osamu Hirota, Kentaro Kato, Masaki Sohma +2
In 2000, an attractive new quantum cryptography was discovered by H.P.Yuen based on quantum communication theory. It is applicable to direct encryption, for example quantum stream…