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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
materials science
Ultrasensitive microwave spectroscopy of paramagnetic impurities in sapphire crystals at millikelvin temperatures
Physical Review B - Condensed Matter and Materials Physics, Volume 88, No. 22, Article 224426, Year 2013
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Description
Progress in the emerging field of engineered quantum systems requires the development of devices that can act as quantum memories. The realization of such devices by doping solid-state cavities with paramagnetic ions imposes a tradeoff between ion concentration and cavity coherence time. Here, we investigate an alternative approach involving interactions between photons and naturally occurring impurity ions in ultrapure crystalline microwave cavities exhibiting exceptionally high quality factors. We implement a hybrid whispering gallery/electron spin resonance method to perform rigorous spectroscopy of an undoped single-crystal sapphire resonator over the frequency range 8-19 GHz, and at external applied DC magnetic fields up to 0.9 T. Measurements of high-purity sapphire cooled close to 100 mK reveal the presence of Fe3+, Cr3+, and V2+ impurities. A host of electron transitions are measured and identified, including the two-photon classically forbidden quadrupole transition (Δms=2) for Fe3+, as well as hyperfine transitions of V2+. © 2013 American Physical Society.
Authors & Co-Authors
Farr, Warrick G.
Australia, Perth
The University of Western Australia
Creedon, Daniel Lloyd
Australia, Perth
The University of Western Australia
Goryachev, Maxim
Australia, Perth
The University of Western Australia
Benmessaï, Karim
Algeria, Algiers
Centre de Développement Des Technologies Avancées
Tobar, Michael E.
Australia, Perth
The University of Western Australia
Statistics
Citations: 42
Authors: 5
Affiliations: 2
Identifiers
Doi:
10.1103/PhysRevB.88.224426
ISSN:
10980121
e-ISSN:
1550235X