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Fluctuations From Edge Defects in Superconducting Resonators
C. Neill, A. Megrant, R. Barends +11
Superconducting resonators, used in astronomy and quantum computation, couple strongly to microscopic two-level defects. We monitor the microwave response of superconducting resona…
Planar Superconducting Resonators with Internal Quality Factors above One Million
A. Megrant, C. Neill, R. Barends +16
We describe the fabrication and measurement of microwave coplanar waveguide resonators with internal quality factors above 10 million at high microwave powers and over 1 million at…
Surface spin fluctuations probed with flux noise and coherence in Josephson phase qubits
Daniel Sank, R. Barends, Radoslaw C. Bialczak +15
We measure the dependence of qubit phase coherence and surface spin induced flux noise on inductor loop geometry. While wider inductor traces change neither the flux noise power sp…
Surface loss simulations of superconducting coplanar waveguide resonators
J. Wenner, R. Barends, R. C. Bialczak +14
Losses in superconducting planar resonators are presently assumed to predominantly arise from surface-oxide dissipation, due to experimental losses varying with choice of materials…
Loss and decoherence due to stray infrared light in superconducting quantum circuits
R. Barends, J. Wenner, M. Lenander +14
We find that stray infrared light from the 4 K stage in a cryostat can cause significant loss in superconducting resonators and qubits. For devices shielded in only a metal box, we…
Photon shell game in three-resonator circuit quantum electrodynamics
Matteo Mariantoni, H. Wang, Radoslaw C. Bialczak +12
The generation and control of quantum states of light constitute fundamental tasks in cavity quantum electrodynamics (QED). The superconducting realization of cavity QED, circuit Q…
Quantum process tomography of two-qubit controlled-Z and controlled-NOT gates using superconducting phase qubits
T. Yamamoto, M. Neeley, E. Lucero +12
We experimentally demonstrate quantum process tomography of controlled-Z and controlled-NOT gates using capacitively-coupled superconducting phase qubits. These gates are realized…