High cooperativity coupling of electron-spin ensembles to superconducting cavities

Details High cooperativity coupling of electron-spin ensembles to superconducting cavities High cooperativity coupling of electron-spin ensembles to superconducting cavities

2010-06-01

arxiv.org/abs/1006.0242v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4pgs, 4 figures

Scientific paper

Electron spins in solids are promising candidates for quantum memories for superconducting qubits because they can have long coherence times, large collective couplings, and many quantum bits can be encoded into the spin-waves of a single ensemble. We demonstrate the coupling of electron spin ensembles to a superconducting transmission-line resonator at coupling strengths greatly exceeding the cavity decay rate and comparable to spin linewidth. We also use the enhanced coupling afforded by the small cross-section of the transmission line to perform broadband spectroscopy of ruby at millikelvin temperatures at low powers. In addition, we observe hyperfine structure in diamond P1 centers and time domain saturation-relaxation of the spins.

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