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Bulletin of the American Physical Society

Transmission line cavity as a quantum memory for superconducting phase qubits

K. Cicak, Fabio Altomare, J.I. Park, Sillanpa a, Raymond W. Simmonds

Published Mar 12, 2008• 0 citations
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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 qubits could be encoded into spin waves of a single ensemble. We demonstrate the coupling of electron-spin ensembles to a superconducting transmission-line cavity at strengths greatly exceeding the cavity decay rates and comparable to the spin linewidths. We also perform broadband spectroscopy of ruby (Al₂O₃:Cr(3+)) at millikelvin temperatures and low powers, using an on-chip feedline. In addition, we observe hyperfine structure in diamond P1 centers.