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Method for assessing atomic sources of flicker noise in superconducting qubits

npj Computational Materials 2021年第1期7卷 1502-1507页

作者： Almog Reshef maytal caspary toroker Department of Materials Science and Engineering Technion–Israel Institute of TechnologyHaifaIsrael The Nancy and Stephen Grand Technion Energy Program HaifaIsrael

Flicker noise causes decoherence in Josephson junction-based superconducting qubits,thus limiting their practical potential as building blocks for quantum *** is due to limited length and complexity of executable algorithms,and increased dependency on error-correcting ***,identifying and subsiding the atomic sources of flicker noise are of great importance to the development of this *** developed a method that combines ab initio DFT calculations and quantum dynamics to model charge transport across a Josephson junction,by which it is possible to more accurately assess different defects as sources of flicker *** demonstrate the use of our method in an investigation of various atomic defects,including vacancies,trapping,and substitutions,in an Al|Al_(2)O_(3)|Al Josephson *** demonstration both reveals weaknesses in previous attempts to pinpoint the atomic sources of flicker noise and highlights new candidates.

关键词： Josephson quantum limiting

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Ternary Ni-Co-Fe oxyhydroxide oxygen evolution catalysts:Intrinsic activity trends,electrical conductivity,and electronic band structure

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Nano Research 2019年第9期12卷 2288-2295页

作者： Michaela Burke Stevens Lisa J. Enman Ester Hamal Korkus Jeremie Zaffran Christina D. M. Trang James Asbury Matthew G. Kast maytal caspary toroker Shannon W. Boettcher Department of Chemistry & Biochemistry and the Materials Science Institute University of OregonEugeneOR 97403USA Department of Materials Science & Engineering and The Nancy & Stephen Grand Technion Energy Program Technion Israel Institute of TechnologyHaifa 3200003Israel

Nickel-,cobalt-,and iron-based(oxy)hydroxides comprise the most-commonly studied electrocatalysts for the oxygen-evolution reaction(OER)in alkaline solution.A fundamental understanding of composition-structure-activity relationships for mixed-metal Ni-Co and Ni-Co-Fe(oxy)hydroxides is important to guide the design of advanced OER *** we use cyclic voltammetry,chronopotentiometry,inductively-coupled plasma-optical emission spectroscopy,and in situ electrical conductivity measurements to characterize the properties and activity of various compositions of Ni-Co-Fe(oxy)hydroxides prepared by cathodic *** with previous studies,we find Fe is essential for the mixed-metal(oxy)hydroxides to achieve high OER *** the rigorous absence of Fe(achieved by using specially cleaned electrolytes),the most-active Ni-Co(oxy)hydroxide composition has an OER turn-over frequency only twice that ofpure Co(oxy)hydroxide,suggesting minimal synergism between the two *** addition of Co to Ni-Fe(oxy)hydroxides shifts the onset of electrical conductivity to lower potentials,but has little effect on the intrinsic OER activity,with the most-active Ni-Co-Fe(oxy)hydroxide having an OER turn-over frequency only -1.5 times that of the Ni-Fe(oxy)*** magnitudes of the electrical conductivities are similar for all the compositions ***-functional-theory-calculated projected density of states show a significant contribution of all chemical elements at the valence band edge of the mixed-metal oxyhydroxide electronic structure,demonstrating significant electronic hybridization between the *** calculations suggest the involvement of all the elements in modulating the electronic structure at putative Fe-based active sites that are probably located at edges or defects in the two-dimensional oxyhydroxide sheets.

关键词： electrocatalysis heterogeneous catalysis water electrolysis oxygen evolution density functional theory

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