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Transformed Dissipation in Superconducting Quantum Circuits
Matthew Neeley, M. Ansmann, Radoslaw C. Bialczak +7
Superconducting quantum circuits must be designed carefully to avoid dissipation from coupling to external control circuitry. Here we introduce the concept of current transformatio…
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…