BEGIN:VCALENDAR VERSION:2.0 PRODID:researchseminars.org CALSCALE:GREGORIAN X-WR-CALNAME:researchseminars.org BEGIN:VEVENT SUMMARY:Menno Veldhorst (QuTech and Kavli Institute of Nanoscience Delft U niversity of Techology\, The Netherlands) DTSTART:20201022T050000Z DTEND:20201022T060000Z DTSTAMP:20260423T005806Z UID:UTSQSI/21 DESCRIPTION:Title: A four-qubit germanium quantum processor\nby Menno Veldhorst (QuTech a nd Kavli Institute of Nanoscience Delft University of Techology\, The Neth erlands) as part of Centre for Quantum Software and Information Seminar Se ries\n\n\nAbstract\nThe prospect of building quantum circuits using advanc ed semiconductor manufacturing positions quantum dots as an attractive pla tform for quantum information processing. Extensive studies on various mat erials have led to demonstrations of two-qubit logic in gallium arsenide\, silicon\, and germanium. However\, interconnecting larger numbers of qubi ts in semiconductor devices has remained an outstanding challenge. Here\, we demonstrate a four-qubit quantum processor based on hole spins in germa nium quantum dots. Furthermore\, we define the quantum dots in a two-by-tw o array and obtain controllable coupling along both directions. Qubit logi c is implemented all-electrically and the exchange interaction can be puls ed to freely program one-qubit\, two-qubit\, three-qubit\, and four-qubit operations\, resulting in a compact and high-connectivity circuit. We exec ute a quantum logic circuit that generates a four-qubit Greenberger-Horne- Zeilinger state and we obtain coherent evolution by incorporating dynamica l decoupling. These results are an important step towards quantum error co rrection and quantum simulation with quantum dots.\n\nHosted by JP Deholla in\, UTS Centre for Quantum Software and Information\n LOCATION:https://researchseminars.org/talk/UTSQSI/21/ END:VEVENT END:VCALENDAR