9 citations · 24 across the 4 of their papers we have counts for
4 papers
Disturbance by optimal discrimination
Ryuitiro Kawakubo, Tatsuhiko Koike
We discuss the disturbance by measurements which unambiguously discriminate between given candidate states. We prove that such an optimal measurement necessarily changes distinguis…
State protection by quantum control before and after noise
Hiroaki Wakamura, Ryûitirô Kawakubo, Tatsuhiko Koike
We discuss the possibility of protecting the state of a quantum system that goes through noise by measurements and operations before and after the noise process. We extend our prev…
Noise suppression by quantum control before and after the noise
Hiroaki Wakamura, Ryûitirô Kawakubo, Tatsuhiko Koike
We discuss the possibility of protecting the state of a quantum system that goes through noise, by measurements/operations before and after the noise process. The aim is to seek fo…
Distinguishability of countable quantum states and von Neumann lattice
Ryuitiro Kawakubo, Tatsuhiko Koike
Condition for distinguishability of countably infinite number of pure states by a single measurement is given. Distinguishability is to be understood as possibility of an unambiguo…