209 citations · 1.6k across the 96 of their papers we have counts for
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A Geometrical Approach to Quantum Estimation Theory
Keiji Matsumoto
This post is the author's doctoral dissertation back in 1997. The dissertation covers following four kinds of problems: First, it studies achievable Cramer-Rao type bounds of vario…
Reversibility of distance measures of states with some focus on total variation distance
Keiji Matsumoto
Consider a classical system, which is in the state described by probability distribution or , and embed these classical informations into quantum system by a physical map $Γ…
Asymptotic Reversibility of Thermal Operations for Interacting Quantum Spin Systems via Generalized Quantum Stein's Lemma
Takahiro Sagawa, Philippe Faist, Kohtaro Kato +3
For quantum spin systems in any spatial dimension with a local, translation-invariant Hamiltonian, we prove that asymptotic state convertibility from a quantum state to another one…
Information storing yields a point-asymmetry of state space in general probabilistic theories
Keiji Matsumoto, Gen Kimura
It is known that the high-dimensional quantum state space is notoriously complicated in contrast with the beautiful Bloch ball of the qubit. We examined the mechanism behind this f…
Considerations in the Time-Energy Uncertainty Relation from the Viewpointt of Hypothesis Testing
Keiji Matsumoto, Susumu Osawa
It is difficult to discriminate between the state of initial time and that of time . The task of discriminating between the two states can be interpreted as the hypot…
On interaction-free measurement
Keiji Matsumoto
This manuscript is inspired by the paper [2]. In the paper, they investigate a method to detect existence of an object with arbitrarily small interaction. Below, we sketch their pr…