BEGIN:VCALENDAR VERSION:2.0 PRODID:-//Sabre//Sabre VObject 4.5.8//EN CALSCALE:GREGORIAN BEGIN:VTIMEZONE TZID:Europe/Zurich X-LIC-LOCATION:Europe/Zurich TZURL:http://tzurl.org/zoneinfo/Europe/Zurich BEGIN:DAYLIGHT TZOFFSETFROM:+0100 TZOFFSETTO:+0200 TZNAME:CEST DTSTART:19810329T020000 RRULE:FREQ=YEARLY;BYMONTH=3;BYDAY=-1SU END:DAYLIGHT BEGIN:STANDARD TZOFFSETFROM:+0200 TZOFFSETTO:+0100 TZNAME:CET DTSTART:19961027T030000 RRULE:FREQ=YEARLY;BYMONTH=10;BYDAY=-1SU END:STANDARD END:VTIMEZONE BEGIN:VEVENT UID:news714@physik.unibas.ch DTSTAMP;TZID=Europe/Zurich:20230621T115907 DTSTART;TZID=Europe/Zurich:20230623T131500 SUMMARY:Next-Generation Qubits in Superconducting Circuits DESCRIPTION:Abstract:\\r\\nOver the past decade\, qubits encoded in superco nducting circuits have emerged as a leading platform for quantum informati on processing\, resulting in a rapidly expanding and thriving research fie ld. However\, present-day superconducting quantum processors are still hig hly susceptible to the effects of environmental noise\, which degrades the ir computational performance and limits applications. As a result\, develo ping next-generation superconducting qubits with improved protection is a major research focus to accelerate the path to a fault-tolerant quantum co mputer.  In this talk\, I will introduce our approach for protecting qua ntum information in superconducting circuits\, which relies on quantum mat erial Josephson junction realized in superconductor-semiconductor hybrid s tructures [1\,2]. First\, I will describe how such hybrid quantum material s when placed in contact with superconductors can give rise to an exotic c harge-4e supercurrent and discuss approaches for experimentally detecting this coherent transport of “pairs of Cooper-pairs“ [3]. Second\, I wil l present resulting insights in how the charge-4e supercurrent can be empl oyed to create a protected “0-Pi“ superconducting qubit in arrays of J osephson junctions and discuss how the Josephson junction arrays can be th eoretically modeled with effective spin models. Finally\, I will compare t he “0-Pi“ protected superconducting qubits to an alternative approach based on topological wavefunctions\, the Majorana zero modes [4\,5]\, and discuss how quantum material Josephson junctions can provide a new avenue for quantum simulation.  [1] C. Schrade\, C. M. Marcus\, A. Gyenis\, PRX Quantum 3\, 030303 (2022) [2] A. Maiani\, M. Kjaergaard\, C. Schrade\, PR X Quantum 3\, 030329 (2022) [3] R. S. Souto\, M. Leijnse\, C. Schrade\, Ph ys. Rev. Lett. 129 267702 (2022) [4] C. Schrade and L. Fu\, Phys. Rev. Let t 129\, 227002 (2022) [5] C. Schrade and L. Fu\, Phys. Rev. Lett. 121\, 26 7002 (2018) X-ALT-DESC:

Abstract:

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Over the past d ecade\, qubits encoded in superconducting circuits have emerged as a leadi ng platform for quantum information processing\, resulting in a rapidly ex panding and thriving research field. However\, present-day superconducting quantum processors are still highly susceptible to the effects of environ mental noise\, which degrades their computational performance and limits a pplications. As a result\, developing next-generation superconducting qubi ts with improved protection is a major research focus to accelerate the pa th to a fault-tolerant quantum computer. \;

In this talk\ , I will introduce our approach for protecting quantum information in supe rconducting circuits\, which relies on quantum material Josephson junction realized in superconductor-semiconductor hybrid structures [1\,2]. First\ , I will describe how such hybrid quantum materials when placed in contact with superconductors can give rise to an exotic charge-4e supercurrent an d discuss approaches for experimentally detecting this coherent transport of “pairs of Cooper-pairs“ [3]. Second\, I will present resulting insi ghts in how the charge-4e supercurrent can be employed to create a protect ed “0-Pi“ superconducting qubit in arrays of Josephson junctions and d iscuss how the Josephson junction arrays can be theoretically modeled with effective spin models. Finally\, I will compare the “0-Pi“ protected superconducting qubits to an alternative approach based on topological wav efunctions\, the Majorana zero modes [4\,5]\, and discuss how quantum mate rial Josephson junctions can provide a new avenue for quantum simulation.& nbsp\;

[1] C. Schrade\, C. M. Marcus\, A. Gyenis\, PRX Quantu m 3\, 030303 (2022)
[2] A. Maiani\, M. Kjaergaard\, C. Schrade\, PRX Quantum 3\, 030329 (2022)
[3] R. S. Souto\, M. Leijnse\, C. Schrade \, Phys. Rev. Lett. 129 267702 (2022)
[4] C. Schrade and L. Fu\, Phy s. Rev. Lett 129\, 227002 (2022)
[5] C. Schrade and L. Fu\, Phys. Re v. Lett. 121\, 267002 (2018)

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