5 papers
Quantum Gambling Using Three Nonorthogonal States
W. -Y. Hwang, K. Matsumoto
We provide a quantum gambling protocol using three (symmetric) nonorthogonal states. The bias of the proposed protocol is less than that of previous ones, making it more practical.…
Irrversibility of Entanglement Manipulations: Vagueness of the Entanglement of Cost and Entanglement of Distillation
W. -Y. Hwang, K. Matsumoto
We show that the entanglement of cost and entanglement of distillation can be vague when we consider a more general form of entanglement manipulation in which we collectively deal…
Shor-Preskill Type Security-Proof for the Quantum Key Distribution without Public Announcement of Bases
W. -Y. Hwang, X. -B. Wang, K. Matsumoto +2
We give a Shor-Preskill type security-proof to the quantum key distribution without public announcement of bases [W.Y. Hwang et al., Phys. Lett. A 244, 489 (1998)]. First, we modif…
Entanglement Measures with Asymptotic Weak-Monotonicity as Lower (Upper) Bound for the Entanglement of Cost (Distillation)
W. -Y. Hwang, Keiji Matsumoto
We propose entanglement measures with asymptotic weak-monotonicity. We show that a normalized form of entanglement measures with the asymptotic weak-monotonicity are lower (upper)…
Shor-Preskill Type Security-Proofs for Concatenated Bennett-Brassard 1984 Quantum Key Distribution Protocol
W. -Y. Hwang, K. Matsumoto, H. Imai +2
We discuss long code problems in the Bennett-Brassard 1984 (BB84) quantum key distribution protocol and describe how they can be overcome by concatenation of the protocol. Observin…