561 citations · 840 across the 17 of their papers we have counts for
17 papers
Determination of the Anisotropy of Permittivity of Quantum Paraelectric Strontium Titanate
Maxim Goryachev, Lingfei Zhao, Zijun Zhao +3
The dielectric properties of strontium titanate (SrTiO) have previously been reported from room temperature to low temperatures with conflicting results. In this work, precisio…
Collective Behaviour of Cr ions in Ruby Revealed by Whispering Gallery Modes
Jeremy Bourhill, Maxim Goryachev, Warrick G. Farr +1
We present evidence for collective action of Cr ion impurities in a highly doped ruby crystal at microwave frequencies. The cylindrical geometry of the crystal allows for th…
Strong Coupling Between P1 Diamond Impurity Centres and 3D Lumped Photonic Microwave Cavity
Daniel L. Creedon, Jean-Michel Le Floch, Maxim Goryachev +3
We report strong coupling between an ensemble of N impurity (P1) centres in diamond and microwave photons using a unique double post re-entrant cavity. The cavity is designed so th…
Evidence of Dilute Ferromagnetism in Rare-Earth doped YAG
W. G. Farr, M. Goryachev, J. M. le Floch +2
This work demonstrates strong coupling regime between an Erbium ion spin ensemble and microwave Hybrid Cavity-Whispering Gallery Modes in a Yttrium Aluminium Garnet dielectric crys…
Strong Coupling Between Whispering Gallery Photons and Spin States of Iron Group Impurity Ions
Maxim Goryachev, Warrick G. Farr, Natalia C. Carvalho +5
Interaction of Whispering Gallery Modes (WGM) with dilute spin ensembles in solids is an interesting paradigm of Hybrid Quantum Systems potentially beneficial for Quantum Signal Pr…
Strong Coupling between Whispering Gallery Modes and Chromium Ions in Ruby
Warrick G. Farr, Maxim Goryachev, Daniel L. Creedon +1
We report the study of interactions between cavity photons and paramagnetic Cr spins in a ruby (Cr:AlO) Whispering Gallery mode (WGM) resonator. Examining the…
High Cooperativity Cavity QED with Magnons at Microwave Frequencies
Maxim Goryachev, Warrick G. Farr, Daniel L. Creedon +3
Using a sub-millimetre sized YIG (Yttrium Iron Garnet) sphere mounted in a magnetic field-focusing cavity, we demonstrate an ultra-high cooperativity of between magnon and p…
Jump Chaotic Behaviour of Ultra Low Loss Bulk Acoustic Wave Cavities
Maxim Goryachev, Warrick G. Farr, Serge Galliou +1
We demonstrate a previously unobserved nonlinear phenomenon in an ultra-low loss quartz Bulk Acoustic Wave cavity (), which only occurs below 20 milli-Kelvin in temp…
Spin-Photon Interaction in a Cavity with Time-Reversal Symmetry Breaking
Maxim Goryachev, Warrick G. Farr, Daniel L. Creedon +1
Employing a sapphire whispering gallery mode resonator, we demonstrate features of the spin-photon interaction in cavities with broken time-reflection symmetry. The broken symmetry…
Controlling a whispering gallery doublet mode avoided frequency crossing: Strong coupling between photon bosonic and spin degrees of freedom
Maxim Goryachev, Warrick G. Farr, Daniel L. Creedon +1
A combination of electron spin interactions in a magnetic field allows us to control the resonance frequencies of a high-Q Whispering Gallery (WG) cavity mode doublet, resulting in…
Giant -factors of Natural Impurities in Synthetic Quartz
Maxim Goryachev, Warrick G. Farr, Michael E. Tobar
We report the observation of -factors of natural paramagnetic impurities in a pure synthetic quartz crystal at milli-Kelvin temperatures. Measurements are made by performing spe…
Spin bath maser in a cryogenically cooled sapphire whispering gallery mode resonator
J. Bourhill, K. Benmessai, M. Goryachev +3
We report the observation of a mechanism of maser generation in an ensemble of inter-coupled, inhomogeneously broadened two-level systems, enhanced by high quality factor electroma…
Ultrasensitive microwave spectroscopy of paramagnetic impurities of sapphire crystals at millikelvin temperatures
Warrick G. Farr, Daniel L. Creedon, Maxim Goryachev +2
Progress in the emerging field of engineered quantum systems requires the development of devices that can act as quantum memories. The realisation of such devices by doping solid s…
Anomalously Strong Nonlinearity of Unswept Quartz Acoustic Cavities at Liquid Helium Temperatures
M. Goryachev, Warrick G. Farr, Eugene N. Ivanov +1
We demonstrate a variety of nonlinear phenomena at extremely low powers in cryogenic acoustic cavities fabricated from quartz material, which have not undergone any electrodiffusio…
Hybrid Electron Spin Resonance and Whispering Gallery Mode Resonance Spectroscopy of Fe3+ in Sapphire
Karim Benmessai, Warrick G. Farr, Daniel L. Creedon +4
The development of a new era of quantum devices requires an understanding of how paramagnetic dopants or impurity spins behave in crystal hosts. Here, we describe a new spectroscop…
High Q-factor Sapphire Whispering Gallery Mode Microwave Resonator at Single Photon Energies and milli-Kelvin Temperatures
Daniel L. Creedon, Yarema Reshitnyk, Warrick Farr +3
The microwave properties of a crystalline sapphire dielectric whispering gallery mode resonator have been measured at very low excitation strength (E/hf=1) and low temperatures (T…
Hybrid optical and electronic laser locking using spectral hole burning
Warrick G. Farr, Jian Wei Tay, Patrick M. Ledingham +2
We report on a narrow linewidth laser diode system that is stabilized using both optical and electronic feedback to a spectral hole in cryogenic Tm:YAG. The laser system exhibits v…