Determination of Low Loss in Isotopically Pure Single Crystal28Si at Low Temperatures and Single Microwave Photon Energy.
The low dielectric losses of an isotopically pure single crystal28Si sample were determined at a temperature of 20 mK and at powers equivalent to that of a single photon. Whispering Gallery Mode (WGM) analysis revealed large Quality Factors of order 2 × 106(dielectric loss ~5 × 10-7) at high powers, degrading to 7 × 105(dielectric loss ~1.4 × 10-6at single photon energy. A very low-loss narrow line width paramagnetic spin flip transition was detected with extreme sensitivity in28Si, with very small concentration below 1010cm-3(less than 10 parts per trillion) and g-factor of 1.995 ± 0.008. Such determination was only possible due to the low dielectric photonic losses combined with the long lifetime of the spin transition (low magnetic loss), which enhances the magnetic AC susceptibility. Such low photonic loss at single photon energy combined with the narrow line width of the spin ensemble, indicate that single crystal28Si could be an important crystal for future cavity QED experiments.
ARC Centre of Excellence for Engineered Quantum Systems, School of Physics, University of Western Australia, 35 Stirling Highway, Crawley WA 6009, Australia.
Nikita
N
Kostylev
ARC Centre of Excellence for Engineered Quantum Systems, School of Physics, University of Western Australia, 35 Stirling Highway, Crawley WA 6009, Australia.
Maxim
M
Goryachev
G.G. Devyatykh Institute of Chemistry of High-Purity Substances of the Russian Academy of Sciences, 49 Tropinin Str., Nizhny Novgorod 603950, Russia.|N.I. Lobachevski State University, 23 Gagarin prosp., Nizhny Novgorod 603950, Russia.
Andrey D
AD
Bulanov
G.G. Devyatykh Institute of Chemistry of High-Purity Substances of the Russian Academy of Sciences, 49 Tropinin Str., Nizhny Novgorod 603950, Russia.
Vladimir A
VA
Gavva
ARC Centre of Excellence for Engineered Quantum Systems, School of Physics, University of Western Australia, 35 Stirling Highway, Crawley WA 6009, Australia.
Michael E
ME
Tobar