BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//CERN//INDICO//EN
BEGIN:VEVENT
SUMMARY:PhD defense rehearsal: Highly integrated RF electronics for readou
 t of superconducting circuits
DTSTART:20261026T130000Z
DTEND:20261026T140000Z
DTSTAMP:20261030T050300Z
UID:indico-event-5896@indico.kit.edu
CONTACT:timo.muscheid@kit.edu
DESCRIPTION:Speakers: Robert Gartmann (KIT-IPE)\n\nRobert Gartmann will pr
 esent his PhD thesis. The presentation will be held in German.\nAbstract:\
 nMicrointegration through lithography of superconducting circuits enables 
 the formation of qubits and quantum sensors\, promising advances in sever
 al scientific fields. Qubits\, leveraging quantum superposition and entan
 glement\, facilitate simulation and modelling of quantum processes. Quant
 um computing establishes new algorithms that drastically reduce the asymp
 totic execution runtime from exponential to polynomial time. Furthermore\,
  detectors can benefit from the cryogenic environment through low ambient 
 noise levels and the macroscopic wave function property of superconductin
 g materials.\nFuture experiments require channel counts of sensors and qub
 its in the thousands. Handling the necessary signals for operation and re
 adout at high resolution and fidelity imposes challenges on the full sign
 al processing chain\, which spans from room temperature to the millikelvi
 n domain. To limit the number of lines and heat conduction to the sample\,
  frequency division multiplexing (FDM) increases the channel count throug
 h waveguide connections. Their substantial bandwidth supports elaborate a
 nalogue and concurrent microwave signal transmission. The high-throughput
  data acquisition (DAQ) electronics are typically founded on software-def
 ined radio (SDR) with a field-programmable gate array (FPGA) core. As the
  latter is a digital-only device\, there is a need for analog-to-digital c
 onverters (ADCs) and digital-to-analog converters (DACs)\, subsequently re
 quiring conversion to RF. At Institute for Data Processing and Electronic
 s (IPE)\, such a flexible SDR for superconducting cryogenic circuits is d
 eveloped\, albeit without custom integrated RF electronics yet. Therefore
 \, capability expansion of the analogue RF stage is needed\, towards high
 er channel counts and channel density through increased instantaneous band
 width. This serves as a foundation for present and upcoming experiments a
 nd applications.\nThe development of the analogue RF signal conditioning h
 ardware is presented in this thesis\, to refine and advance both current 
 and proposed developments in cryogenic electronics interfacing. While sta
 rting from general criteria and drafting of requirements\, it culminates 
 in the creation of two pieces of hardware for two use cases: cryogenic qua
 ntum sensor readout and qubit characterisation. Multiple evaluation print
 ed circuit boards (PCBs) are also introduced\, with advanced methodology 
 and measurements. This thesis guides through the concepts\, schematic cap
 ture and PCB routing\, manufacturing\, assembly and finally verification 
 of the full systems in use. Besides synthetic characterisation and valida
 tion throughout the chapters\, each also contains multiple real world expe
 riments\, demonstrating the newly gained capabilities of simultaneous 400
  channel readout and standalone qubit entanglement.\nThe main challenges 
 and intricacies along the way enable a thorough understanding for future 
 scalability. The thesis therefore establishes an essential contribution fo
 r utilisation of the SDR and beyond in future projects.\n \n \n \n\nht
 tps://indico.kit.edu/event/5896/
LOCATION:Seminarraum EG + zoom (IPE)
URL:https://indico.kit.edu/event/5896/
END:VEVENT
END:VCALENDAR