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PRODID:UW-Madison-Physics-Events
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SEQUENCE:1
UID:UW-Physics-Event-9654
DTSTART:20260903T150000Z
DTEND:20260903T230000Z
DTSTAMP:20260417T095940Z
LAST-MODIFIED:20260415T163116Z
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 work\, we overcome this limitation by demonstrating flux-frustrate
 d transmons [1] that utilize the interference of higher-order harmonic
 s in highly transparent epitaxial Al-InAs Josephson junctions (JJs) to
  achieve strongly enhanced anharmonicity. We experimentally demonstrat
 e anharmonicity exceeding 100%\, reaching as high as 800% with respect
  to the qubit transition frequency\, at the half-integer flux sweet-sp
 ot without any increased sensitivity to the o set-charge noise. This e
 nhancement allows us to achieve raw Rabi frequencies exceeding 100 MHz
  without the need for complex pulse shaping\, greatly simplifying qubi
 t control.  
\n
\nBuilding on this approach\, I will then present our 
 ongoing e orts to further generalize these unique qubit architectures 
 into devices with single JJs and multiple sweet-spots\, alongside our 
 progress in raising the operating temperature of these qubits to aroun
 d 1 Kelvin to facilitate easier scaling. Ultimately\, this combination
  of strong intrinsic anharmonicity\, flux tunability and a minimalisti
 c bare-bones device architecture - requiring no additional Josephson e
 lements or electrical gating highlights the unique advantages that hig
 hly transparent superconducting-semiconducting junctions o er to scala
 ble quantum information processing. 
\n
\n[1] S. Liu*\, A. Bordoloi* e
 t al.\, Nature Communications 17\, 740 (2026) 
URL:https://www.physics.wisc.edu/events/?id=9654
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