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Characterization and reduction of microfabrication-induced decoherence in superconducting quantum circuits
C. M. Quintana, A. Megrant, Z. Chen +18
Many superconducting qubits are highly sensitive to dielectric loss, making the fabrication of coherent quantum circuits challenging. To elucidate this issue, we characterize the i…
Fabrication and Characterization of Aluminum Airbridges for Superconducting Microwave Circuits
Zijun Chen, Anthony Megrant, Julian Kelly +16
Superconducting microwave circuits based on coplanar waveguides (CPW) are susceptible to parasitic slotline modes which can lead to loss and decoherence. We motivate the use of sup…
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…
Characterizing the rate and coherence of single-electron tunneling between two dangling bonds on the surface of silicon
Zahra Shaterzadeh-Yazdi, Lucian Livadaru, Marco Taucer +4
We devise a scheme to characterize tunneling of an excess electron shared by a pair of tunnel-coupled dangling bonds on a silicon surface -- effectively a two-level system. Theoret…
Nanoscale structuring of tungsten tip yields most coherent electron point-source
Josh Y. Mutus, Lucian Livadaru, Radovan Urban +3
This report demonstrates the most spatially-coherent electron source ever reported. A coherence angle of 14.3 +/- 0.5 degrees was measured, indicating a virtual source size of 1.7…
Low Energy Electron Point Projection Microscopy of Suspended Graphene, the Ultimate "Microscope Slide"
J. Y. Mutus, L. Livadaru, J. T. Robinson +5
Point Projection Microscopy (PPM) is used to image suspended graphene using low-energy electrons (100-200eV). Because of the low energies used, the graphene is neither damaged or c…