A5102883945- 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
- Mechanical and Optical Resonators
- Advanced Fiber Laser Technologies
- Photonic and Optical Devices
- High-pressure geophysics and materials
- Astrophysics and Cosmic Phenomena
- Advanced Frequency and Time Standards
- Seismic Waves and Analysis
- Radio Astronomy Observations and Technology
- Atomic and Subatomic Physics Research
- Statistical and numerical algorithms
- Advanced MEMS and NEMS Technologies
- Cold Atom Physics and Bose-Einstein Condensates
- Advanced Measurement and Metrology Techniques
- Advanced Fiber Optic Sensors
- Semiconductor Lasers and Optical Devices
- Force Microscopy Techniques and Applications
- Astronomical Observations and Instrumentation
- Magnetic confinement fusion research
- Superconducting Materials and Applications
ARC Centre of Excellence for Gravitational Wave Discovery
2017-2025
Australian National University
2016-2025
Australian Research Council
2024
Quantum (Australia)
2020
National Measurement Institute
2012-2014
The University of Queensland
2009-2012
ARC Centre of Excellence for Engineered Quantum Systems
2011-2012
University of Otago
2005-2011
MacDiarmid Institute for Advanced Materials and Nanotechnology
2009-2011
Sandia National Laboratories California
2001
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...
The motion of a mechanical object, even human-sized should be governed by the rules quantum mechanics. Coaxing them into state is, however, difficult because thermal environment masks any signature object's motion. also effects proposed modifications mechanics at large mass scales. We prepared center-of-mass 10-kilogram oscillator in with an average phonon occupation 10.8. reduction temperature, from room temperature to 77 nanokelvin, is commensurate 11 orders-of-magnitude suppression...
We implement a cavity optoelectromechanical system integrating electrical actuation capabilities of nanoelectromechanical devices with ultrasensitive mechanical transduction achieved via intracavity optomechanical coupling. Electrical gradient forces as large 0.40 microN are realized, simultaneous sensitivity 1.5x10{-18} m Hz{-1/2} representing 3 orders magnitude improvement over any to date. Optoelectromechanical feedback cooling is demonstrated, exhibiting strong squashing the in-loop...
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">...
Abstract Gravitational waves from coalescing neutron stars encode information about nuclear matter at extreme densities, inaccessible by laboratory experiments. The late inspiral is influenced the presence of tides, which depend on star equation state. Neutron mergers are expected to often produce rapidly rotating remnant that emit gravitational waves. These will provide clues extremely hot post-merger environment. This signature in contains most 2–4 kHz frequency band, outside sensitive...
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...
The detection of gravitational waves from compact binary mergers by LIGO has opened the era wave astronomy, revealing a previously hidden side cosmos.To maximize reach existing observatory facilities, we have designed new instrument able to detect at distances 5 times further away than possible with Advanced LIGO, or greater 100 event rate.Observations this will make dramatic steps toward understanding physics nearby universe, as well observing universe out cosmological black hole...
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...
Sensors based on whispering gallery mode resonators can detect single nanoparticles and even molecules. Particles attaching to the resonator induce a doublet in transmission spectrum which provides self-referenced detection signal. However, practice this spectral feature is often obscured by width of resonance line hides structure. This happens particularly liquid environments that reduce effective Q factor resonator. In paper we demonstrate an interferometric setup allows direct hidden thus...
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...
We present measurement results for a laser frequency reference, implemented with an all-optical fiber Michelson interferometer, down to frequencies as low 1 mHz. Optical is attractive space-based operations it physically robust, small and lightweight. The free spectral range of interferometers also provides the possibility prestabilize two lasers on distant spacecraft ensures that beatnote remains within detector bandwidth. demonstrate these are viable candidates future laser-based gravity...
We experimentally demonstrate thermo-optic locking of a semiconductor laser to an integrated toroidal optical microcavity. The lock is maintained for time periods exceeding twelve hours, without requiring any electronic control systems. Fast achieved by feedback induced scattering centers within the microcavity, with thermal due heating maintaining constructive interference between cavity and laser. Furthermore, acts narrow linewidth, ultra high quality microtoroid resonances offering...
We present a method for the linearization and minimization of interferometer cyclic error. utilize polynomial curve fitting resampling algorithm to correct nonlinear mirror displacement. In frequency domain, this compresses error into single-frequency component enables precise measurement in noise-dominated environment. have applied technique determine range components. addition, we used these measurements optimize configuration performance such that routinely achieve ∼50 pm our custom...
We use digitally enhanced heterodyne interferometry to measure the stability of optical fiber laser frequency references. Suppression noise by over four orders magnitude is achieved using post processing time delay interferometry, allowing us mechanical for frequencies as low 100 μHz. The performance interferometer platform used here not practically limited dynamic range or bandwidth issues that can occur in feedback stabilization systems. This allows longer measurement times, better...
A cavity opto-electromechanical system is reported which combines the ultrasensitive transduction of optomechanical systems with electrical actuation nanoelectromechanical systems. Ultrasensitive mechanical achieved via opto-mechanical coupling. Electrical gradient forces as large 0.40 $\mu$N are realized, facilitating strong ultralow dissipation. scanning probe microscope implemented, capable characterizing modes. The integration into devices an enabling step towards regime quantum...
Cavity optoelectromechanical regenerative amplification is demonstrated. An optical cavity enhances mechanical transduction, allowing sensitive measurement even for heavy oscillators. A 27.3 MHz mode of a microtoroid was linewidth narrowed to 6.6\pm1.4 mHz, 30 times smaller than previously achieved with radiation pressure driving in such system. These results may have applications areas as ultrasensitive optomechanical mass spectroscopy.
We configure an all-fiber digital interferometer to eliminate both code noise and Rayleigh backscatter from bidirectional measurements. utilize a sawtooth phase ramp upconvert beyond our signal bandwidth, demonstrating in-band reduction of approximately two orders magnitude. In addition, we demonstrate, for the first time knowledge, use relative delays within digital-interferometer system Rayleigh-backscatter noise, resulting in factor 50. Finally, identify double as limiting source suggest...
Conventional heterodyne readout schemes are now under reconsideration due to the realization of techniques evade its inherent 3 dB signal-to-noise penalty. The application high-frequency, quadrature-entangled, two-mode squeezed states can further improve sensitivity audio-band signals. In this Letter, we experimentally demonstrate quantum-enhanced two spatially distinct interferometers with direct optical signal combination, circumventing Applying a state, show improvement an injected audio...
Abstract Phase-sensitive amplification of squeezed states is a technique to mitigate high detection loss, which especially attractive at 2μm wavelengths. We derived an analytical model proving that amplified can phase noise significantly. Our discloses two practical parameters: the effective measurable squeezing and efficiency states. A realistic case study includes dynamics gain-dependent impedance matching conditions amplifier. results recommend operating optical parametric amplifier gains...
We demonstrate phase control for vacuum-squeezed light at a 2 μm wavelength, which is necessary technology proposed future gravitational wave observatories. The scheme allowed examination of noise behavior frequencies below 1 kHz and indicated that squeezing this frequency was limited by dark scattered light. directly measure 3.9±0.2 dB from to 80 14.2±0.3 antisqueezing relative the shot level. observed maximum level currently photodetector quantum efficiency laser instabilities new...