Ultralow-power spectroscopy of a rare-earth spin ensemble using a superconducting resonator
P Bushev, AK Feofanov, H Rotzinger, I Protopopov, JH Cole, CM Wilson, G Fischer, A Lukashenko, AV Ustinov
Physical Review B | AMER PHYSICAL SOC | Published : 2011
We thank M. Azarkh and M. Drescher for the ESR study of Er:YSO crystals, A. Abdumalikov and O. Astafiev (NEC) for the fabrication of the SC resonator, and C. Muller for his useful comments and critical reading of the manuscript. This work was supported by the CFN of DFG, the EU Projects MIDAS, SCOPE, and SOLID, and the BMBF Programm "Quantum Communications" through the project QUIMP. I. P. acknowledges the support of the Alexander von Humboldt Foundation. P. B. acknowledges the financial support of KIT and MWK of Baden-Wurttemberg through the RiSC Grant.