5 papers
Does "quantum nonlocality without entanglement" have quantum origin?
Masato Koashi, Koji Azuma, Shinya Nakamura +1
Quantum separable operations are defined as those that cannot produce entanglement from separable states, and it is known that they strictly surpass local operations and classical…
Quantum catalysis of information
Koji Azuma, Masato Koashi, Nobuyuki Imoto
Heisenberg's uncertainty principle and recently derived many no-go theorems including the no-cloning theorem and the no-deleting theorem have corroborated the idea that we can neve…
Quantum cloning with nonlocal assistance: Complement of Jozsa's stronger no-cloning theorem
Koji Azuma, Masato Koashi, Hosho Katsura +1
We investigate the cases where a set of states cannot be cloned by itself, but is clonable with the help of another system prepared in state . When $S…
Probabilistic cloning with supplementary information
Koji Azuma, Junichi Shimamura, Masato Koashi +1
We consider probabilistic cloning of a state chosen from a mutually nonorthogonal set of pure states, with the help of a party holding supplementary information in the form of pure…
Proper magnetic fields for nonadiabatic geometric quantum gates in NMR
Kazuto Oshima, Koji Azuma
In a scheme of nonadiabatic purely geometric quantum gates in nuclear magnetic resonance(NMR) systems we propose proper magnitudes of magnetic fields that are suitable for an exper…