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VERSION:2.0
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PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:3
UID:UW-Physics-Event-9654
DTSTART:20260903T150000Z
DTEND:20260903T230000Z
DTSTAMP:20260904T224115Z
LAST-MODIFIED:20260902T145406Z
LOCATION:5310 Chamberlin Hall
SUMMARY:Strongly anharmonic flux-tunable transmon based on InAs-Al two
 -dimensional heterostructure \, R. G. Herb Condensed Matter Seminar\, 
 Arunav Bordoloi\, NYU
DESCRIPTION:Superconducting qubits inherently face a longstanding trad
 eoff between anharmonicity and susceptibility to charge noise - a limi
 tation that affects even state-of-the-art transmons and gatemons. In t
 his talk\, I will present a flux-frustrated transmon architecture [1] 
 that overcomes this tradeoff by exploiting the interference of higher-
 order harmonics in highly transparent epitaxial Al-InAs Josephson junc
 tions. Using this approach\, we experimentally demonstrate anharmonici
 ty exceeding 100% and reaching up to 800% of the qubit transition freq
 uency at the half-integer flux sweet spot\, without introducing additi
 onal sensitivity to offset-charge noise. The resulting large anharmoni
 city enables raw Rabi frequencies exceeding 100 MHz without complex pu
 lse shaping\, providing a simple and robust route toward faster qubit 
 control.
\n
\nI will then discuss our ongoing efforts to extend this p
 latform toward higher-temperature operation\, with the goal of realizi
 ng superconducting qubits near 1 Kelvin to facilitate the scaling of q
 uantum hardware. Finally\, I will present preliminary results on gate-
 tunable superconductor–insulator transitions in epitaxial Al-InAs he
 terostructures\, demonstrating the broader potential of this platform 
 for exploring dissipative quantum phenomena and electrically tunable s
 uperconducting devices.
\n
\n[1] S. Liu*\, A. Bordoloi* et al.\, Natur
 e Communications 17\, 740 (2026)
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URL:https://www.physics.wisc.edu/events/?id=9654
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