7 citations · 11 across the 3 of their papers we have counts for
4 papers
Maximum logarithmic derivative bound on quantum state estimation as a dual of the Holevo bound
Koichi Yamagata
In quantum estimation theory, the Holevo bound is known as a lower bound of weighed traces of covariances of unbiased estimators. The Holevo bound is defined by a solution of a min…
Quantum monotone metrics induced from trace non-increasing maps and additive noise
Koichi Yamagata
Quantum monotone metric was introduced by Petz,and it was proved that quantum monotone metrics on the set of quantum states with trace one were characterized by operator monotone f…
Noncommutative Lebesgue decomposition and contiguity with applications in quantum statistics
Akio Fujiwara, Koichi Yamagata
We herein develop a theory of contiguity in the quantum domain based upon a novel quantum analogue of the Lebesgue decomposition. The theory thus formulated is pertinent to the wea…
Noncommutative Lebesgue decomposition with application to quantum local asymptotic normality
Akio Fujiwara, Koichi Yamagata
We develop a theory of local asymptotic normality in the quantum domain based on a noncommutative extension of the Lebesgue decomposition. This formulation gives a substantial gene…