Publications (15)
Determination of Niobium Cavity Magnetic Field Screening via a Dispersively Hybridized Magnonic Sensor
Graeme Flower, Benjamin McAllister, Maxim Goryachev +1
A method for determining the internal DC magnetic field inside a superconducting cavity is presented. The method relies on the relationship between magnetic field and frequency of…
Adapting a Cryogenic Sapphire Oscillator for Very Long Baseline Interferometry
Sheperd Doeleman, Tao Mai, Alan Rogers +3
Extension of very long baseline interferometry (VLBI) to observing wavelengths shorter than 1.3mm provides exceptional angular resolution (~20 micro arcsec) and access to new spect…
Stabilized free-space optical frequency transfer
David Gozzard, Sascha Schediwy, Benjamin Stone +2
The transfer of high-precision optical frequency signals over free-space links, particularly between ground stations and satellites, will enable advances in fields ranging from coh…
Precision Measurement of a low-loss Cylindrical Dumbbell-Shaped Sapphire Mechanical Oscillator using Radiation Pressure
Jeremy Bourhill, Eugene Ivanov, Michael Tobar
We present first results from a number of experiments conducted on a 0.53 kg cylindrical dumbbell-shaped sapphire crystal. This is the first reported optomechanical experiment of t…
Low Noise Microwaves for Testing Fundamental Physics
Eugene Ivanov, Michael Tobar
We studied noise properties of microwave signals transmitted through the cryogenic resonator. The experiments were performed with the 11.342 GHz sapphire loaded cavity resonator co…
Metallised 3D printed plastic resonator demonstrates superconductivity below 4 K
Jeremy Bourhill, Gwendal Cochet, Julien Haumant +4
We report the first observation of a superconducting transition in a 3D printed, metallised-plastic device. A cylindrical cavity is 3D printed from a photosensitive polymer resin a…
Ultra-High Cooperativity Interactions between Magnons and Resonant Photons in a YIG sphere
Jeremy Bourhill, Nikita Kostylev, Maxim Goryachev +2
Resonant photon modes of a 5mm diameter YIG sphere loaded in a cylindrical cavity in the 10-30GHz frequency range are characterised as a function of applied DC magnetic field at mi…
Power-to-Frequency Conversion in Cryogenic Sapphire Resonators
Eugene Ivanov, Michael Tobar
We studied how the cryogenic sapphire resonator responds to fast variations of the dissipated microwave power. The experiments were carried out with sapphire resonators cooled to 6…
Coupling 4H-Silicon Carbide spins to a microwave resonator at milli-Kelvin temperature
Ali Fawaz, Jeremy Bourhill, Stefania Castelletto +6
Coupling microwave cavity modes with spin qubit transitions is crucial for enabling efficient qubit readout and control, long-distance qubit coupling, quantum memory implementation…
Electrodynamic improvements to the theory of magnetostatic modes in ferrimagnetic spheres and their applications to saturation magnetization measurements
Jerzy Krupka, Adam Pacewicz, Bartlomiej Salski +4
Electrodynamic theory applied to the analysis of TEn0p mode resonances in ferromagnetic spheres placed either in metallic cavities or in the free space is compared with Walker-Flet…
Point-to-Point Stabilised Optical Frequency Transfer with Active Optics
Benjamin P. Dix-Matthews, Sascha W. Schediwy, David R. Gozzard +8
Timescale comparison between optical atomic clocks over ground-to-space and terrestrial free-space laser links will have enormous benefits for fundamental and applied science, from…
Methods for coherent optical Doppler orbitography
Benjamin P. Dix-Matthews, Sascha W. Schediwy, David R. Gozzard +4
Doppler orbitography uses the Doppler shift in a transmitted signal to determine the orbital parameters of satellites including range and range-rate (or radial velocity). We descri…
Testing Lorentz Invariance Using an Odd-Parity Asymmetric Optical Resonator
Fred Baynes, Andre Luiten, Michael Tobar
We present the first experimental test of Lorentz invariance using the frequency difference between counter-propagating modes in an asymmetric odd-parity optical resonator. This ty…
Method of Power Recycling in Co-Axial Mach Zender Interferometers for Low Noise Measurements
Stephen Parker, Eugene Ivanov, Michael Tobar
We present the first experimental study of a new type of power recycling microwave interferometer designed for low noise measurements. This system enhances sensitivity to phase flu…
Limits on Dark Photons, Scalars, and Axion-Electromagnetodynamics with The ORGAN Experiment
Ben T. McAllister, Aaron Quiskamp, Ciaran O'Hare +4
Axions are a well-motivated dark matter candidate, with a host of experiments around the world searching for direct evidence of their existence. The ORGAN Experiment is a type of a…