collaborators

6 papers

quant-ph2026

Amplification and generation bounds of gravity-induced entanglement in pulsed optomechanical systems

Daisuke Miki, Alfred Li, Yanbei Chen

We investigate gravity-induced entanglement between the output optical fields of two red-detuned pulsed optomechanical systems with their masses coupled by mutual gravitational int…

quant-ph2026

Universal Bound for Entanglement Generation

Alfred Li, Daisuke Miki, Yanbei Chen

We derive a universal condition for entanglement generation under general bilinear interactions in the presence of white thermal noise. While various protocols have been proposed t…

quant-ph2026

Measurement-Based Estimation of Causal Conditional Variances and Its Application to Macroscopic quantum phenomenon

Kosei Hatakeyama, Ryotaro Fukuzumi, Akira Matsumura +2

We analytically investigate a quantum estimation method for a mechanical oscillator in a detuned cavity system based solely on homodyne measurement records, building on the framewo…

quant-ph2026

Theoretical Study of the Squeezed-Light-Enhanced Sensitivity to Gravity-Induced Entanglement via Finite-Time Analysis

Kosei Hatakeyama, Daisuke Miki, Kazuhiro Yamamoto

We investigate the advantage of using squeezed input light for generating gravity-induced entanglement (GIE) through Fourier-domain analysis. Based on the findings of Ref.~\cite{Mi…

quant-ph2026

Momentum Squeezed State Realized via Optimal Filtering in Optomechanics: Implications for Gravity-Induced Entanglement

Ryotaro Fukuzumi, Kosei Hatakeyama, Daisuke Miki +1

We analyze the conditional quantum state of a mechanical mirror in an optomechanical system subject to continuous measurement, feedback control, and quantum filtering. We identify…

gr-qc2025

Space-based cm/kg-scale Laser Interferometer for Quantum Gravity

Nobuyuki Matsumoto, Katsuta Sakai, Kosei Hatakeyama +5

The experimental verification of the quantum nature of gravity represents a milestone in quantum gravity research. Recently, interest has grown for testing it via gravitationally i…