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SUMMARY:High-coherence foundry-compatible superconducting qubit platform
DTSTART:20260415T080000Z
DTEND:20260415T090000Z
DTSTAMP:20260420T041400Z
UID:indico-event-18710@indico.psi.ch
CONTACT:andreas.elben@psi.ch\;cornelius.hempel@psi.ch
DESCRIPTION:Speakers: Anton Potočnik (IMEC Leuven)\n\nThe field of superc
 onducting qubit technology has experienced rapid development over the past
  two decades. Recent advancements in the fabrication\, control and measure
 ment of superconducting quantum devices have enabled integration of hundre
 ds of qubits on a single chip. However\, the path towards larger-scale int
 egration of thousands of qubits on a chip remains unclear. This talk prese
 nts imec’s platform for scalable superconducting qubit fabrication\, whi
 ch is based on foundry-compatible thin film processing [1] and overlay Jos
 ephson-junction fabrication [2]. The platform enables all-optical superco
 nducting transmon qubit fabrication on 300 mm wafers\, achieving near stat
 e-of-the-art coherence times\, record-low aging and comparable Josephson j
 unction variability to standard shadow-evaporation technique [3]. A key fo
 cus of this presentation will be the understanding and mitigation of micr
 owave losses induced by various fabricaiton steps such as Ar-milling [4]\,
  oxide removal [6\,7] and materials such as a-Ta [5] or ultra-high-resist
 ivity silicon. The talk will conclude with an outline of ongoing efforts 
 toward large-scale qubit characterization and control using cryo-CMOS elec
 tronics operating near qubits at the mixing-chamber plate of a dilution re
 frigerator [8].\n \n[1] Mongillo\, et al.\, IEDM (2022). \n[2] Verjauw 
 et al.\, npj Quantum Information 8\, 93 (2022). \n[3] Van Damme\, et al.\
 , Nature\, 634\, 74 (2024).\n[4] Van Damme\, et al.\, PRA 20\, 014034 (20
 23).\n[5] Lozano\, et al. Mater. Quantum. Technol. 4\, 025801 (2024).\n[6
 ] Verjauw\, et al.\, PRA 16\, 014018 (2021).\n[7] Lozano\, et al.\, Adva
 nced Science 12\, e09244 (2025).\n[8] Acharya\, et al.\, Nature Electroni
 cs\, 6\, 900 (2023).\n\nhttps://indico.psi.ch/event/18710/
LOCATION:OSGA/EG6ab
URL:https://indico.psi.ch/event/18710/
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