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Ultrasensitive microwave spectroscopy of paramagnetic impurities of sapphire crystals at millikelvin temperatures | | Warrick G. Farr
; Daniel L. Creedon
; Maxim Goryachev
; Karim Benmassai
; Michael E. Tobar
; | | Date: |
5 Nov 2013 | | Abstract: | 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 state cavities with paramagnetic ions imposes a
trade-off between ion concentration and cavity coherence time. Here, we
investigate an alternative approach involving interactions between photons and
naturally occurring impurity ions in ultra-pure 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 a high
purity sapphire cooled close to 100 mK reveal the presence of Fe$^{3+}$,
Cr$^{3+}$, and V$^{2+}$ impurities. A host of electron transitions are measured
and identified, including the two-photon classically forbidden quadrupole
transition ($Delta m_s =2$) for Fe$^{3+}$, as well as hyperfine transitions of
V$^{2+}$. | | Source: | arXiv, 1311.1049 | | Services: | Forum | Review | PDF | Favorites | |
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