250 citations · 858 across the 6 of their papers we have counts for
4 papers · 1 filter
Microwave Dielectric Loss at Single Photon Energies and milliKelvin Temperatures
Aaron D. O'Connell, M. Ansmann, R. C. Bialczak +9
The microwave performance of amorphous dielectric materials at very low temperatures and very low excitation strengths displays significant excess loss. Here, we present the loss t…
1/f Flux Noise in Josephson Phase Qubits
Radoslaw C. Bialczak, R. McDermott, M. Ansmann +8
We present a new method to measure 1/f noise in Josephson quantum bits (qubits) that yields low-frequency spectra below 1Hz. Comparison of noise taken at positive and negative bias…
Temperature dependence of coherent oscillations in Josephson phase qubits
J. Lisenfeld, A. Lukashenko, M. Ansmann +2
We experimentally investigate the temperature dependence of Rabi oscillations and Ramsey fringes in superconducting phase qubits driven by microwave pulses. In a wide range of temp…
State tomography of capacitively shunted phase qubits with high fidelity
Matthias Steffen, M. Ansmann, R. McDermott +7
We introduce a new design concept for superconducting quantum bits (qubits) in which we explicitly separate the capacitive element from the Josephson tunnel junction for improved q…