7 citations · 22 across the 6 of their papers we have counts for
6 papers
Entanglement partners and monogamy in de Sitter universes
Yasusada Nambu, Koji Yamaguchi
We investigate entanglement of local spatial modes defined by a quantum field in a de Sitter universe. The introduced modes show dis-entanglement behavior when the separation betwe…
Entanglement is better teleported than transmitted
Koji Yamaguchi, Achim Kempf
We show that, for the purpose of quantum communication via a quantum field, it is essential to view the field not only as a medium for transmission but also as a source of entangle…
Smooth Metric Adjusted Skew Information Rates
Koji Yamaguchi, Hiroyasu Tajima
Metric adjusted skew information, induced from quantum Fisher information, is a well-known family of resource measures in the resource theory of asymmetry. However, its asymptotic…
Beyond i.i.d. in the Resource Theory of Asymmetry: An Information-Spectrum Approach for Quantum Fisher Information
Koji Yamaguchi, Hiroyasu Tajima
Energetic coherence is indispensable for various operations, including precise measurement of time and acceleration of quantum manipulations. Since energetic coherence is fragile,…
Modification of a Lie-algebra-based approach and its application to asymptotic symmetries on a Killing horizon
Takeshi Tomitsuka, Koji Yamaguchi
We develop a new approach to find asymptotic symmetries in general relativity as a modification of the Lie-algebra-based approach proposed in T. Tomitsuka et al. [Classical Quantum…
A Lie algebra based approach to asymptotic symmetries in general relativity
Takeshi Tomitsuka, Koji Yamaguchi, Masahiro Hotta
Asymptotic symmetries of black hole spacetimes have received much attention as a possible origin of the Bekenstein-Hawking entropy in black hole thermodynamics. In general, it take…