32 citations · 44 across the 8 of their papers we have counts for
10 papers
Leakage benchmarking with decohering subgroups in the presence of preparation and measurement errors
Shawn Geller, Tongyu Zhao, Alex Kwiatkowski +3
A common problem with physical qubits is that the state can leak outside the computational subspace. To characterize the problem, it is desirable to measure both the leakage probab…
Digital Etching of Single-Crystalline Silicon Fin Barriers Down to Sub-10 nm
Yu Wu, Teun A. J. van Schijndel, Anthony P. McFadden +3
This work presents a fabrication process to realize sub-10 nm-thick, high-aspect-ratio Si fins using high-resistivity float-zone single-crystal Si wafers. Following anisotropic wet…
Magnetic flux distribution, quasiparticle spectroscopy, and quality factors in Nb films for superconducting qubits
Amlan Datta, Bicky S. Moirangthem, Kamal R. Joshi +6
Niobium is a practical material platform for superconducting microwave circuits; however, device-level performance can vary significantly depending on film growth and processing co…
Quasiparticle spectroscopy in tantalum films with different Ta/sapphire interfaces
Bicky S. Moirangthem, Kamal R. Joshi, Anthony P. Mcfadden +8
One of the crucial aspects of current research in quantum information science is the identification and control of loss mechanisms in superconducting circuits. Although microwave m…
Cryogenic growth of aluminum: structural morphology, optical properties, superconductivity and microwave dielectric loss
Wilson J. Yánez-Parreño, Teun A. J. van Schijndel, Anthony P. McFadden +7
We explore the molecular beam epitaxy synthesis of superconducting aluminum thin films grown on c-plane sapphire substrates at cryogenic temperatures of 6 K and compare their behav…
Interface-sensitive microwave loss in superconducting tantalum films sputtered on c-plane sapphire
Anthony P. McFadden, Jinsu Oh, Lin Zhou +5
Quantum coherence in superconducting circuits has increased steadily over the last decades as a result of a growing understanding of the various loss mechanisms. Recently, tantalum…
Fabrication and characterization of low-loss Al/Si/Al parallel plate capacitors for superconducting quantum information applications
Anthony McFadden, Aranya Goswami, Tongyu Zhao +7
Increasing the density of superconducting circuits requires compact components, however, superconductor-based capacitors typically perform worse as dimensions are reduced due to lo…
Cryogenic growth of tantalum thin films for low-loss superconducting circuits
Teun A. J. van Schijndel, Anthony P. McFadden, Aaron N. Engel +5
Motivated by recent advancements highlighting Ta as a promising material in low-loss superconducting circuits and showing long coherence times in superconducting qubits, we have ex…
Towards merged-element transmons using silicon fins: the FinMET
Aranya Goswami, Anthony P. McFadden, Tongyu Zhao +7
A merged-element transmon (MET) device, based on silicon (Si) fins, is proposed and the first steps to form such a "FinMET" are demonstrated. This new application of fin technology…
Frequency-Tunable Josephson Junction Resonator for Quantum Computing
K. D. Osborn, J. A. Strong, A. J. Sirois +1
We have fabricated and measured a high-Q Josephson junction resonator with a tunable resonance frequency. A dc magnetic flux allows the resonance frequency to be changed by over 10…