32 citations · 85 across the 11 of their papers we have counts for
11 papers
Boosting Gravity-Induced Entanglement through Parametric Resonance
Yuka Shiomatsu, Youka Kaku, Akira Matsumura +1
Establishing quantum gravity theory remains one of the major challenges in modern physics, as the lack of experimental evidence makes it difficult to explore. In response to this c…
Toward graviton detection via photon-graviton quantum state conversion
Taiki Ikeda, Youka Kaku, Sugumi Kanno +1
A magnetic field enables the interconversion of photons and gravitons, yet the process is usually analysed only at the level of classical wave equations. We revisit photon-graviton…
The Role of Quantum Measurements when Testing the Quantum Nature of Gravity
Daisuke Miki, Youka Kaku, Yubao Liu +2
In order to test the quantum nature of gravity, it is essential to explore the construction of classical gravity theories that are as consistent with experiments as possible. In pa…
Sudden Decoherence by Resonant Particle Excitation for Testing Gravity-Induced Entanglement
Youka Kaku, Akira Matsumura, Tomohiro Fujita
We propose a novel method to probe gravity-induced entanglement. We consider the gravitational interaction between a particle trapped in a shallow potential and a harmonic oscillat…
Gravitational entanglement witness through Einstein ring image
Youka Kaku, Yasusada Nambu
We investigate the interplay between quantum theory and gravity by exploring gravitational lensing and Einstein ring images in a weak gravitational field induced by a mass source i…
Inverted Oscillators for Testing Gravity-induced Quantum Entanglement
Tomohiro Fujita, Youka Kaku, Akira Matsumura +1
In the quest for quantum gravity, we have lacked experimental verification, hampered by the weakness of gravity and decoherence. Recently, various experiments have been proposed to…
Enhancement of quantum gravity signal in an optomechanical experiment
Youka Kaku, Tomohiro Fujita, Akira Matsumura
No experimental evidence of the quantum nature of gravity has been observed yet and a realistic setup with improved sensitivity is eagerly awaited. We find two effects, which can s…
Energy extraction from AdS black holes via superradiance
Takaaki Ishii, Youka Kaku, Keiju Murata
Superradiance is known as a wave amplification process caused by rotating or charged black holes. We argue that the superradiance of stationary black holes in asymptotically AdS sp…
Quantumness of gravity in harmonically trapped particles
Youka Kaku, Shin'ya Maeda, Yasusada Nambu +1
This study investigates the quantumness of gravity under the setup of the atomic interferometry from the viewpoint of mass-energy equivalence. We evaluated interference visibility…
Creating stars orbiting in AdS
Youka Kaku, Keiju Murata, Jun Tsujimura
We propose a method to create a star orbiting in an asymptotically AdS spacetime using the AdS/CFT correspondence. We demonstrate that by applying an appropriate source in the quan…
Observing black holes through holographic superconductors
Youka Kaku, Keiju Murata, Jun Tsujimura
We propose a way to observe the photon ring of the asymptotically anti-de Sitter black hole dual to a superconductor on the two-dimensional sphere. We consider the electric current…