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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:0
UID:UW-Physics-Event-9079
DTSTART:20250204T150000Z
DTEND:20250204T170000Z
DTSTAMP:20260413T170651Z
LAST-MODIFIED:20250129T175729Z
LOCATION:5310 CH
SUMMARY:Novel Quantum Devices for Computation and Sensing\, Thesis Def
 ense\, Abigail Shearrow\, Physics PhD student
DESCRIPTION:Josephson junction-based devices have demonstrated utility
  in a breadth of applications ranging from quantum computation to sens
 ing and meteorology. In this talk we introduce two novel superconducti
 ng devices: a protected qubit relying on engineered composite Josephso
 n elements and a mm-wave detector utilizing a Josephson junction for i
 mpedance matching to free space to enhance power absorption efficiency
 . First we introduce a novel quantum sensor\, consisting of impedance-
 matched Josephson junction-based slot antennas embedded in a microwave
  kinetic inductance detector. We discuss operating principles and desi
 gn of such devices. We present data on the response of devices to a th
 ermal quasiparticle distribution and the calibration of the detector u
 sing a blackbody source. And finally spectroscopic characterization of
  the devices with a Josephson emitter. In the second part of this thes
 is we describe work toward the design\, control\, and characterization
  of a novel protected qubit\, the charge-parity qubit\, consisting of 
 a composite pi-periodic Josephson element shunted by a large capacitan
 ce. Such a device provides protection against local noise at the hardw
 are level and aspires to substantially reduce the overhead needed for 
 quantum error correction. Together these projects demonstrate the vers
 atility the Josephson junction in superconducting quantum devices.
URL:https://www.physics.wisc.edu/events/?id=9079
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