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SUMMARY:Extra seminar: Are we all set with materials for qubits? - Sergey 
 Frolov (University of Pittsburgh)
DTSTART:20250414T140000Z
DTEND:20250414T150000Z
UID:TALK229921@talks.cam.ac.uk
CONTACT:Lucas Sá
DESCRIPTION:I will discuss superconducting qubits and quantum dot spin qub
 its. The basic physics of these platforms is fairly understood and non-con
 troversial. The bigger circuits tend to use similar materials\, such as al
 uminum and silicon. These are a great superconductor and a great semicondu
 ctor\, for device applications. But similar qubits can also be made out of
  different materials which come with larger gaps\, stronger spin-orbit int
 eraction\, electrical and not magnetic tunability and other nominal advant
 ages. We are working on unexplored materials for those\, namely Sn-based I
 nAs nanowire Josephson junctions and PbTe nanowire quantum dots. Of course
  new materials are less mature as device platforms\, but trying to make th
 em perform can offer valuable lessons and expand our understanding of what
  works and why. Mainstream technologies can hit future bottlenecks and hav
 ing reserve ideas will come in handy. For instance\, our InAs-Sn transmono
 s have reached a T1 relaxation time of 27 microseconds\, only one order of
  magnitude below state-of-the-art. How far can we go?
LOCATION:Cluster Seminar Room\, Ray Dolby Centre\, Cavendish Laboratory\, 
 JJ Thomson Avenue\, CB3 0US
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