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UID:UW-Physics-Event-3883
DTSTART:20160419T150000Z
DURATION:PT1H0M0S
DTSTAMP:20260419T110811Z
LAST-MODIFIED:20160418T145922Z
LOCATION:5310 Chamberlin Hall
SUMMARY:Semiconductors for Superconducting Qubits\, R. G. Herb Condens
 ed Matter Seminar\, Karl Petersson\, University of Copenhagen
DESCRIPTION:We have developed a superconducting transmon qubit with a 
 semiconductor-based Josephson junction element [1\,2]. The junction is
  made from an InAs nanowire with in situ molecular beam epitaxy-grown 
 superconducting Al contacts. This gate-controlled transmon\, or gatemo
 n\, allows simple tuning of the qubit transition frequency using a gat
 e voltage to vary the density of carriers in the semiconductor region.
  In the first generations of devices we have measured coherence times 
 up to 10 µs. These coherence times\, combined with stable qubit opera
 tion\, permit single qubit rotations with fidelities of ~99.5% for all
  gates including voltage-controlled Z rotations. Towards multi-qubit o
 peration we have also implemented a two qubit voltage-controlled cPhas
 e gate. In contrast to flux-tuned transmons\, voltage-tunable gatemons
  may simplify the task of scaling to multi-qubit circuits and enable n
 ew means of control for many qubit architectures.<br>
\n<br>
\n[1] T. 
 W. Larsen et al.\, Phys. Rev. Lett. 115\, 127001 (2015).<br>
\n[2] G. 
 de Lange et al.\, Phys. Rev. Lett. 115\, 127002 (2015).<br>
\n
URL:https://www.physics.wisc.edu/events/?id=3883
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