6 papers
Trade-off Relation for Black Hole Entropy Fluctuations
Kensuke Gallock-Yoshimura, Yoshihiko Hasegawa
Black holes respond to infalling quantum matter fields by changing their entropy. Since such matter is quantum in nature, the entropy response should be sensitive to its quantum fl…
Exact treatment of the memory kernel under time-dependent system-environment coupling via a train of delta distributions
Yuta Uenaga, Kensuke Gallock-Yoshimura, Takano Taira
Memory effects in a quantum system coupled to an environment are one of the central features in the theory of open quantum systems. The dynamics of such quantum systems are typical…
Bipartite and tripartite entanglement in pure dephasing relativistic spin-boson model
Kensuke Gallock-Yoshimura, Erickson Tjoa
We study nonperturbatively the entanglement generation between two and three emitters in an exactly solvable relativistic variant of the spin-boson model, equivalent to the time-in…
Relativistic quantum Otto heat engine using a three-level Unruh-DeWitt detector
Tomoya Hirotani, Kensuke Gallock-Yoshimura
In this study, we explore a relativistic quantum Otto heat engine with a qutrit as the working substance interacting with a quantum scalar field in curved spacetime. Unlike qubits,…
Acceleration-induced radiation from a qudit particle detector model
Kensuke Gallock-Yoshimura, Yuki Osawa, Yasusada Nambu
We nonperturbatively examine the emission rate of acceleration-induced radiation from a uniformly accelerated gapless qudit-type Unruh-DeWitt detector. We find that the emission ra…
Decoherence of spin superposition state caused by a quantum electromagnetic field
Kensuke Gallock-Yoshimura, Yuuki Sugiyama, Akira Matsumura +1
In this study, we investigate the decoherence of a spatially superposed electrically neutral spin- particle in the presence of a relativistic quantum electromagnetic field…