A5091492769- Pulsars and Gravitational Waves Research
- Gamma-ray bursts and supernovae
- Geophysics and Gravity Measurements
- Astrophysical Phenomena and Observations
- Geophysics and Sensor Technology
- Cosmology and Gravitation Theories
- Advanced Frequency and Time Standards
- Mechanical and Optical Resonators
- Astrophysics and Cosmic Phenomena
- Seismic Waves and Analysis
- Cold Atom Physics and Bose-Einstein Condensates
- High-pressure geophysics and materials
- Radio Astronomy Observations and Technology
- Atomic and Subatomic Physics Research
- Advanced Fiber Laser Technologies
- Statistical and numerical algorithms
- Astronomical Observations and Instrumentation
- Magnetic confinement fusion research
- Superconducting Materials and Applications
- Black Holes and Theoretical Physics
- Adaptive optics and wavefront sensing
- Photonic and Optical Devices
- Seismology and Earthquake Studies
- Advanced MEMS and NEMS Technologies
- Advanced Measurement and Metrology Techniques
ARC Centre of Excellence for Gravitational Wave Discovery
2017-2025
Australian National University
2016-2025
Australian Research Council
2022-2024
Quantum (Australia)
2016-2017
Cardiff University
2011
Carleton College
2011
California Institute of Technology
2011
Andrews University
2011
Charles Sturt University
2011
LIGO Scientific Collaboration
2011
The Laser Interferometer Gravitational Wave Observatory (LIGO) has been directly detecting gravitational waves from compact binary mergers since 2015. We report on the first use of squeezed vacuum states in direct measurement with Advanced LIGO H1 and L1 detectors. This achievement is culmination decades research to implement gravitational-wave During ongoing O3 observation run, are improving sensitivity interferometers signals above 50 Hz by up 3 dB, thereby increasing expected detection...
This Horizon Study describes a next-generation ground-based gravitational-wave observatory: Cosmic Explorer. With ten times the sensitivity of Advanced LIGO, Explorer will push astronomy towards edge observable universe ($z \sim 100$). The goals this are to describe and evaluate design concepts for Explorer; plan United States' leadership in astronomy; envisage role international effort build "Third-Generation" (3G) observatory network that make discoveries transformative across astronomy,...
The field of squeezed states for gravitational-wave (GW) detector enhancement is rapidly maturing. In this review paper, we provide an analysis the circa 2013. We begin by outlining concept and description quantum states. This followed overview how can improve GW detection, requirements on to achieve such enhancement. Next, current technology producing states, using atoms, optomechanical methods nonlinear crystals, provided. finally highlight milestone squeezing implementation experiments at...
The two 4 km long gravitational wave detectors operated by the Laser Interferometer Gravitational-wave Observatory (LIGO) were modified in 2008 to read out channel using DC readout form of homodyne detection and include an optical filter cavity at output detector. As part upgrade Enhanced LIGO, these modifications replaced radio-frequency (RF) heterodyne system used previously. We describe motivations for implementation mode cleaner LIGO. present characterizations system, including...
Cosmic Explorer is a next-generation ground-based gravitational-wave observatory concept, envisioned to begin operation in the 2030s and expected be capable of observing binary neutron star black hole mergers back time first stars. Explorer's sensitive band will extend below 10 Hz, where design predominantly limited by geophysical, thermal, quantum noises. In this work, seismic, gravity-gradient, quantum, residual gas, scattered-light, servo-control noises are analyzed order motivate...
Abstract Gravitational-wave observations by the laser interferometer gravitational-wave observatory (LIGO) and Virgo have provided us a new tool to explore Universe on all scales from nuclear physics cosmos massive potential further impact fundamental physics, astrophysics, cosmology for decades come. In this paper we studied science capabilities of network LIGO detectors when they reach their best possible sensitivity, called A <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"...
Direct detection of gravitational radiation in the audio band is being pursued with a network kilometer-scale interferometers (LIGO, Virgo, KAGRA). Several space missions (LISA, DECIGO, BBO) have been proposed to search for sub-hertz from massive astrophysical sources. Here we examine potential sensitivity three ground-based detector concepts aimed at 0.1--10 Hz band. We describe plethora sources this and make estimates their event rates thereby, requirements these detectors. The scientific...
Interferometric gravitational-wave detectors are complex instruments comprised of a Michelson interferometer enhanced by multiple coupled cavities. Active feedback control is required to operate these and keep the cavities locked on resonance. The optical response highly nonlinear until good operating point reached. linear range between 1% fringe for each degree freedom. resonance lock has be achieved in all five degrees freedom simultaneously, making acquisition difficult. Furthermore,...
Gravitational-wave astronomy has revolutionized humanity's view of the universe, a revolution driven by observations that no other field can make. This white paper describes an observatory builds on decades investment National Science Foundation and will drive discovery for to come: Cosmic Explorer. Major discoveries in are three related improvements: better sensitivity, higher precision, opening new observational windows. Explorer promises all deliver order-of-magnitude greater sensitivity...
LISA Pathfinder's measurement of a relative acceleration noise between two free-falling test masses with square root the power spectral density $5.2 \pm 0.1 \mbox{ fm s}^{-2}/\sqrt{\rm{Hz}}$ appreciably constrains collapse models. In particular, we bound localization rate parameter, $λ_{\rm CSL}$, in continuous spontaneous model (CSL) to be at most $\left( 2.96 0.12 \right) \times 10^{-8} s}^{-1}$. Moreover, regularization scale, $σ_{\rm DP}$, used Diosi-Penrose (DP) least $40.1 0.5 fm}$....
We present and characterize a narrow-linewidth external-cavity diode laser at 2 μ m, show that it represents low-cost, high-performance alternative to fiber lasers for research into m photonic technologies next-generation gravitational-wave detectors. A linewidth of 20 kHz 10 ms integration time was measured without any active stabilization, with frequency noise ∼ 15 Hz/ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:msqrt> <mml:mrow class="MJX-TeXAtom-ORD">...
Gravitational Wave interferometers achieve their profound sensitivity by combining a Michelson interferometer with optical cavities, suspended masses, and now, squeezed quantum states of light. These modify the measurement process LIGO, VIRGO GEO600 to reduce noise that masks astrophysical signals; thus, improvements squeezing are essential further expand our gravitational view universe. Further reducing will require both lowering decoherence from losses as well more sophisticated...
Third-generation (3G) gravitational-wave detectors will observe thousands of coalescing neutron star binaries with unprecedented fidelity. Extracting the highest precision science from these signals is expected to be challenging owing both high signal-to-noise ratios and long-duration signals. We demonstrate that current Bayesian inference paradigms can extended analysis binary without breaking computational bank. construct reduced order models for $\sim 90\,\mathrm{minute}$ long signals,...
Abstract Optimised alignment is important in optical systems, particularly high-precision instrumentation such as gravitational wave detectors, order to maximise the sensitivity. During operations, high performing wave-front sensing and feedback systems are used maintain cavity performance. However, need for an automated initial process arises after maintenance or large environmental disturbances earthquakes, it can be challenging manually achieve optimised well consistent alignments. In...
We present the design and commissioning of a cryogenic low-vibration test facility that measures displacement noise from gram-scale silicon cantilever at level 10−16m/Hz 1 kHz. This sensitivity is necessary for future tests thermal models on cross sections suspension samples proposed gravitational-wave detectors. A volume ∼36 l enclosed by radiation shields cooling an optical cavity suspended multi-stage pendulum chain providing isolation acoustic environmental noise. 3 kg housing...
Coupled optical cavities, which support normal modes, play a critical role in filtering, sensing, slow-light generation, and quantum state manipulation. Recent theoretical work has proposed incorporating nonlinear materials into these systems to enable novel technologies. Here, we report the first experimental demonstration of squeezing generated quantum-enhanced coupled-cavity system, achieving noise reduction 3.5 dB at normal-mode splitting frequency 7.47 MHz. We provide comprehensive...
Ultralight bosons with masses in the range from <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:mo>∼</a:mo><a:msup><a:mrow><a:mn>10</a:mn></a:mrow><a:mrow><a:mo>−</a:mo><a:mn>22</a:mn></a:mrow></a:msup><a:mtext> </a:mtext><a:mtext> </a:mtext><a:mi>eV</a:mi><a:mo>/</a:mo><a:msup><a:mrow><a:mi>c</a:mi></a:mrow><a:mrow><a:mn>2</a:mn></a:mrow></a:msup></a:mrow></a:math> to <c:math xmlns:c="http://www.w3.org/1998/Math/MathML"...
Newtonian gravitational noise from seismic fields will become a limiting source at low frequency for second-generation, gravitational-wave detectors. It is planned to use sensors surrounding the detectors' test masses coherently subtract using Wiener filters derived correlations between and detector data. In this work, we data seismometer array deployed corner station of LIGO Hanford combined with tiltmeter detailed characterization field predict achievable Newtonian-noise subtraction...
We present the generation and detection of squeezed light in 2 μm wavelength region. This experiment is a crucial step realizing quantum noise reduction techniques that will be required for future generations gravitational-wave detectors. Squeezed vacuum generated via degenerate optical parametric oscillation from periodically poled potassium titanyl phosphate crystal, dual resonant cavity. The uses frequency stabilized 1984 nm thulium fiber laser, squeezing detected using balanced homodyne...
Abstract The evolution of fault strength and behavior during the initial stages slip plays an important role in driving onset instability weakening. Using small-displacement triaxial experiments on quartz sandstone, this study highlights rapid microstructural change interfaces identifies new evidence for physical processes with increasing velocity. Pre-ground surfaces have been slipped over a range velocities (0.36 µm s–1 to 18 cm s–1) at normal stresses comparable upper- mid-crustal...
Digitally enhanced heterodyne interferometry is a laser metrology technique employing pseudo-random codes phase modulated onto an optical carrier.We present the first characterization of technique's displacement sensitivity.The cavity was measured using digitally and compared to simultaneous readout based on conventional Pound-Drever-Hall locking.The techniques agreed within 5 pm/ √ Hz at 1 Hz, providing upper bound noise interferometry.These measurements employed real-time signal extraction...