30 citations · 67 across the 11 of their papers we have counts for
12 papers
Time-of-flight force sensing below the quantum zero-point fluctuation
Sotatsu Otabe, Mitsuyoshi Kamba, Yuto Kojima +1
Sensing weak forces through observing a mechanical motion near or below its quantum zero-point fluctuation has been desired in diverse areas. While mechanical oscillators have play…
A levitated nano-accelerometer sensitized by quantum quench
M. Kamba, S. Otabe, K. Funo +2
We realize a nanoscale accelerometer exploiting the nonequilibrium dynamics of a nanoparticle near the quantum ground state. We explore the dynamics after quenching the trapping po…
Sensitivity Enhancement in Atom-Interferometer Gyroscopes via Phase-Modulation Signal Readout Scheme
Sotatsu Otabe, Naoki Kaku, Tomoya Sato +3
Quantum sensors based on atom interferometers are advancing both fundamental physics and practical applications, with higher sensitivity being a key requirement for these investiga…
Observation of an Optical Spring in a Robustly Controlled Signal-Recycled Michelson Interferometer
Kaido Suzuki, Ken-ichi Harada, Ryo Iden +4
We present, to the best of our knowledge, the first demonstration of an optical spring in a signal-recycled Michelson interferometer without arm cavities. The setup utilizes multip…
Closed-loop measurements in an atom interferometer gyroscope with velocity-dependent phase-dispersion compensation
Tomoya Sato, Naoki Nishimura, Naoki Kaku +4
Atom interferometer-based gyroscopes are expected to have a wide range of applications due to their high sensitivity. However, their dynamic range is limited by dephasing caused by…
Analyzing the sensitivity of an atom interferometer with a phase-modulation readout scheme
Takuya Kawasaki, Sotatsu Otabe, Tomoya Sato +3
The sensitivity of an interferometer depends on its readout scheme. However, little attention has been paid to the readout schemes of atom interferometers from the viewpoint of the…
Kerr-Enhanced Optical Spring
Sotatsu Otabe, Wataru Usukura, Kaido Suzuki +4
We propose and experimentally demonstrate the generation of enhanced optical springs using the optical Kerr effect. A nonlinear optical crystal is inserted into a Fabry-Perot cavit…
Photothermal effect in macroscopic optomechanical systems with an intracavity nonlinear optical crystal
Sotatsu Otabe, Kentaro Komori, Ken-ichi Harada +3
Intracavity squeezing is a promising technique that may improve the sensitivity of gravitational wave detectors and cool optomechanical oscillators to the ground state. However, th…
Input optics systems of the KAGRA detector during O3GK
T. Akutsu, M. Ando, K. Arai +246
KAGRA, the underground and cryogenic gravitational-wave detector, was operated for its solo observation from February 25th to March 10th, 2020, and its first joint observation with…
Performance of the KAGRA detector during the first joint observation with GEO 600 (O3GK)
KAGRA Collaboration, H. Abe, R. X. Adhikari +212
KAGRA, the kilometer-scale underground gravitational-wave detector, is located at Kamioka, Japan. In April 2020, an astrophysics observation was performed at the KAGRA detector in…
Improving force sensitivity by amplitude measurement of light reflected from a detuned optomechanical cavity
Kentaro Komori, Takuya Kawasaki, Sotatsu Otabe +3
The measurement of weak continuous forces exerted on a mechanical oscillator is a fundamental problem in various physical experiments. It is fundamentally impeded by quantum back-a…
Overview of KAGRA : KAGRA science
KAGRA Collaboration, T. Akutsu, M. Ando +240
KAGRA is a newly build gravitational-wave observatory, a laser interferometer with 3 km arm length, located in Kamioka, Gifu, Japan. In this paper in the series of KAGRA-featured a…