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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…
Implementing the Quantum von Neumann Architecture with Superconducting Circuits
Matteo Mariantoni, H. Wang, T. Yamamoto +14
The von Neumann architecture for a classical computer comprises a central processing unit and a memory holding instructions and data. We demonstrate a quantum central processing un…
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…
Toolbox of resonant quantum gates in Circuit QED
G. Haack, F. Helmer, M. Mariantoni +2
We propose the implementation of fast resonant gates in circuit quantum electrodynamics for quantum information processing. We show how a suitable utilization of three-level superc…
Two-resonator circuit QED: A superconducting quantum switch
Matteo Mariantoni, Frank Deppe, A. Marx +3
We introduce a systematic formalism for two-resonator circuit QED, where two on-chip microwave resonators are simultaneously coupled to one superconducting qubit. Within this frame…
Quantum Zeno Effect in the Quantum Non-Demolition Detection of Itinerant Photons
Ferdinand Helmer, Matteo Mariantoni, Enrique Solano +1
We analyze the detection of itinerant photons using a quantum non-demolition (QND) measurement. We show that the backaction due to the continuous measurement imposes a limit on the…
Two-dimensional cavity grid for scalable quantum computation with superconducting circuits
Ferdinand Helmer, Matteo Mariantoni, Austin G. Fowler +3
Superconducting circuits are among the leading contenders for quantum information processing. This promising avenue has been strengthened with the advent of circuit quantum electro…
Orthogonally-Driven Superconducting Qubit in Circuit QED
M. J. Storcz, M. Mariantoni, H. Christ +6
We consider a superconducting charge qubit coupled to distinct orthogonal electromagnetic field modes belonging to a coplanar wave guide and a microstrip transmission line resonato…
On-Chip Microwave Fock States and Quantum Homodyne Measurements
M. Mariantoni, M. J. Storcz, F. K. Wilhelm +6
We propose a method to couple metastable flux-based qubits to superconductive resonators based on a quantum-optical Raman excitation scheme that allows for the deterministic genera…