An optical ring cavity is used to place the first laboratory constraints on parity-odd nonrenormalizable Lorentz violation. Variations in resonant frequencies are limited to parts in 10(15). Absolute sensitivity to Lorentz-violating operators of m...
A search for Lorentz violation in electrodynamics was performed by measuring the resonant frequency difference between two counterpropagating directions of an optical ring cavity. Our cavity contains a dielectric element, which makes our cavity se...
CLASSICAL AND QUANTUM GRAVITY 28(9) 094011 2011年5月 [査読有り]
The objectives of the DECi-hertz Interferometer Gravitational Wave Observatory (DECIGO) are to open a new window of observation for gravitational wave astronomy and to obtain insight into significant areas of science, such as verifying and charact...
We present the first upper limit on gravitational wave (GW) backgrounds at an unexplored frequency of 0.2 Hz using a torsion-bar antenna (TOBA). A TOBA was proposed to search for low-frequency GWs. We have developed a small-scaled TOBA and success...
We investigated the quantum state of an optomechanical suspended mirror under
continuous measurement and feedback control using Wiener filtering. We focus on
the impact of the two-mode theory of suspended mirror on the quantum state,
which is desc...
Pendulums have long been used as force sensors due to their ultimately low
dissipation (high-quality factor) characteristic. They are widely used in the
measurement of the gravitational constant, detection of gravitational waves,
and determination...
This study is aimed at investigating the feasibility of generating quantum
entanglement between macroscopic mechanical mirrors in optomechanical systems
while under continuous measurement and feedback control. We carefully derive a
covariance matr...
Jordy G. Santiago-Condori   Naoki Yamamoto   Nobuyuki Matsumoto   
2020年8月
In quantum mechanics, measurement can be used to prepare a quantum state.
This principle is applicable even for macroscopic objects, which may enable us
to see classical-quantum transition. Here, we demonstrate conditional
mechanical squeezing of ...