Yutaro Enomoto
A5088989717- Pulsars and Gravitational Waves Research
- Geophysics and Sensor Technology
- Gamma-ray bursts and supernovae
- Cold Atom Physics and Bose-Einstein Condensates
- Neural Networks and Reservoir Computing
- Geophysics and Gravity Measurements
- Mechanical and Optical Resonators
- Quantum Information and Cryptography
- Seismic Waves and Analysis
- High-pressure geophysics and materials
- Optical Network Technologies
- Astrophysical Phenomena and Observations
- Cosmology and Gravitation Theories
- Photonic and Optical Devices
- Atomic and Subatomic Physics Research
- Advanced Fiber Laser Technologies
- Advanced Frequency and Time Standards
- Astrophysics and Cosmic Phenomena
- Superconducting Materials and Applications
- Magnetic confinement fusion research
- Black Holes and Theoretical Physics
- Quantum Mechanics and Applications
- Adaptive optics and wavefront sensing
- Scientific Measurement and Uncertainty Evaluation
- Quantum Computing Algorithms and Architecture
The University of Tokyo
2016-2024
California Institute of Technology
2022
Kavli Institute for the Physics and Mathematics of the Universe
2016
Abstract KAGRA is a newly built gravitational-wave telescope, laser interferometer comprising arms with length of 3 km, located in Kamioka, Gifu, Japan. was constructed under the ground and it operated using cryogenic mirrors that help reducing seismic thermal noise. Both technologies are expected to provide directions for future telescopes. In 2019, finished all installations designed configuration, which we call baseline KAGRA. For this occasion, present an overview from various viewpoints...
KAGRA is a newly built gravitational wave observatory, laser interferometer with 3 km arm length, located in Kamioka, Gifu, Japan. In this series of articles, we present an overview the baseline KAGRA, for which finished installing designed configuration 2019. This article describes method calibration (CAL) used reconstructing signals from detector outputs, as well characterization (DET). We also review physical environmental monitors (PEM) system and geophysics (GIF). Both are...
Major construction and initial-phase operation of a second-generation gravitational-wave detector KAGRA has been completed. The entire 3-km is installed underground in mine order to be isolated from background seismic vibrations on the surface. This allows us achieve good sensitivity at low frequencies high stability detector. Bare-bones equipment for interferometer first test run was accomplished March April 2016 with rather simple configuration. initial configuration named {\it iKAGRA}. In...
Abstract KAGRA is a newly build gravitational wave observatory, laser interferometer with 3 km arm length, located in Kamioka, Gifu, Japan. In this paper, one of series articles featuring KAGRA, we discuss the science targets projects, considering not only baseline (current design) but also its future upgrade candidates (KAGRA+) for near to middle term ($\sim$5 years).
We demonstrate universal and programmable three-mode linear-optical operations in the time domain by realizing a scalable dual-loop optical circuit suitable for quantum information processing (QIP). The programmability, validity, deterministic operation of our are demonstrated performing nine different on squeezed-state pulses, fully characterizing outputs with variable measurements, confirming their entanglement. Our can be scaled up just making outer loop longer also extended to computers...
KAGRA is a second-generation interferometric gravitational-wave detector with 3-km arms constructed at Kamioka, Gifu in Japan. It now its final installation phase, which we call bKAGRA (baseline KAGRA), scientific observations expected to begin late 2019. One of the advantages underground location least 200 m below ground surface, brings small seismic motion low frequencies and high stability detector. Another advantage that it cools down sapphire test mass mirrors cryogenic temperatures...
Abstract KAGRA, the kilometer-scale underground gravitational-wave detector, is located at Kamioka, Japan. In April 2020, an astrophysics observation was performed KAGRA detector in combination with GEO 600 detector; this operation called O3GK. The optical configuration O3GK based on a power-recycled Fabry–Pérot–Michelson interferometer; all mirrors were set room temperature. duty factor of approximately 53%, and displacement sensitivity 1 × 10−18 ${\rm m}/\sqrt{\rm {Hz}}$ 250 Hz....
A quantum processor to import, process, and export optical states is a common core technology enabling various photonic information processing. However, there has been no that simultaneously universal, scalable, programmable. Here, we report on an original loop-based single-mode versatile designed be Our can perform arbitrarily many steps of programmable operations given state by time-domain processing in dynamically controlled circuit. We use this demonstrate Gaussian gates multistep...
Variational quantum algorithms (VQAs) provide a promising approach to achieving advantage for practical problems on near-term noisy intermediate-scale (NISQ) devices. Thus far, most studies VQAs have focused qubit-based systems, but the power of can be potentially boosted by exploiting infinite-dimensional continuous-variable (CV) systems. Here, we implement CV version one VQA, approximate optimization algorithm, developing an automated collaborative computing system between programmable...
Precise measurements of the displacement of, and force acting on, a mechanical oscillator can be performed by coupling to an optical cavity. Brownian thermal forces represent fundamental limit measurement sensitivity which impedes ability use precise as tool enquiry, particularly in context macroscopic quantum tabletop gravitational experiments. A torsion pendulum with low resonant frequency limited very small forces---from its suspensions---at frequencies above resonance. Here, we report...
Abstract We report the mirror suspension design for large-scale cryogenic gravitational wave telescope, KAGRA, during bKAGRA phase 1. Mirror thermal noise is one of fundamental noises room-temperature gravitational-wave detectors such as Advanced LIGO and Virgo. Thus, reduction required further improvement their sensitivity. One effective approach reducing to cool mirrors. There are many technical challenges that must be overcome mirrors, cryocooler induced vibrations, drift in suspensions,...
Upgrades to improve the sensitivity of gravitational wave detectors enable more frequent detections and precise source parameter estimation. Unlike other advanced interferometric such as Advanced LIGO Virgo, KAGRA requires a different approach for upgrade since it is only detector which employs cryogenic cooling test masses. In this paper, we describe possible upgrades with technologies focusing on bands compare impacts detection compact binary coalescences. We show that either fivefold...
Cryogenic cooling of the test masses interferometric gravitational wave detectors is a promising way to reduce thermal noise. However, cryogenic limits incident power masses, which freedom shaping quantum also requires short and thick suspension fibers extract heat, could result in worsening Therefore, careful tuning multiple parameters necessary designing sensitivity detectors. Here, we propose use particle swarm optimization optimize these We apply it for KAGRA detector, show that binary...
The test mass suspensions of cryogenic gravitational-wave detectors such as the KAGRA project are tasked with extracting heat deposited on optics. Thus these have a non-uniform temperature, requiring calculation thermal noise in non-equilibrium conditions. While it is not possible to describe whole suspension system one local temperature anywhere still well defined. We therefore generalize application fluctuation-dissipation theorem mechanical systems, pioneered by Saulson and Levin,...
Modern ground-based gravitational wave (GW) detectors require a complex interferometer configuration with multiple coupled optical cavities.Since achieving the resonances of arm cavities is most challenging among lock acquisition processes, scheme called length stabilization (ALS) had been employed for cavities.We designed new type ALS, which compatible interferometers having long arms like next generation GW detectors.The features ALS are that control simpler than those previous ones and it...
KAGRA is a new gravitational wave detector which aims to begin joint observation with Advanced LIGO and Virgo from late 2019. Here, we present KAGRA's possible upgrade plans improve the sensitivity in decade ahead. Unlike other state-of-the-art detectors, requires different investigations for since it only employs cryogenic cooling of test mass mirrors. In this paper, on can be realized by changing input laser power, increasing mirror mass, injecting frequency dependent squeezed vacuum are...
Abstract KAGRA is a 3-km interferometric gravitational wave telescope located in the Kamioka mine Japan. It first km-class constructed underground to reduce seismic noise, and use cryogenic cooling of test masses thermal noise. The construction infrastructure house interferometer tunnel, initial phase operation with simple Michelson configuration have been completed. expected 2018, observing runs full are 2020s. basic current status described.
Abstract Ground-based interferometric gravitational wave detectors are highly precise sensors for weak forces, limited in sensitivity across their detection band by quantum fluctuations of light. Current and future instruments address this limitation injecting frequency-dependent squeezed vacuum into the port, utilizing narrow-band, low-loss optical cavities optimal rotation squeezing ellipse at each signal frequency. This study introduces a novel scheme employing principles teleportation...
Ground-based interferometric gravitational-wave detectors are highly precise sensors for weak forces, limited in sensitivity across their detection band by quantum fluctuations of light. Current and future instruments address this limitation injecting frequency-dependent squeezed vacuum into the port, utilizing narrow-band, low-loss optical filter cavities optimal rotation squeezing ellipse at each signal frequency. This study introduces a scheme such injection employing principles...
We propose and demonstrate a method to, in principle, completely remove shot noise of optical beat-note detection using squeezed light. This leads to improving the sensitivity various spatial/temporal measurements.
A vibration isolation system called the Type-Bp used for power recycling mirrors has been developed KAGRA, interferometric gravitational-wave observatory in Japan. suspension of passively isolates an optic from seismic using three main pendulum stages equipped with two vertical systems. compact reaction mass around each allows achieving sufficient damping performance a simple feedback as well ratio. Three systems were installed and proved to satisfy requirements on performance, also...
KAGRA is a 3-km cryogenic interferometric gravitational wave telescope located at an underground site in Japan. In order to achieve its target sensitivity, the relative positions of mirrors interferometer must be finely adjusted with attached actuators. We have developed model simulate length control loops realistic suspension responses and various noises for mirror actuation. Using our model, we designed actuation parameters sufficient force range acquire lock as well all degrees freedom...