KIP-Veröffentlichungen

Superconducting Nanowire Single Photon Detectors (SNSPDs) provide high detection ef- ficiencies and fast count rates over a broad wavelength range, leading to their use in many high performance applications. Due to their operation at cryogenic temperatures, readout via electrical wires is limited in scalability due to the wires’ thermal load. An alternative interfacing strategy is provided by optical readout, which could offer lower thermal load and higher data transfer bandwidths via optical fiber interconnects. To this end, I investigate in this thesis new possibilities of interfacing SNSPDs with electro-optic-modulators such that the SNSPDs voltage signals could be registered via optical readout. I propose and investigate three new interfacing circuits, which give rise to output voltages two orders of magnitude larger than reported for similar previous circuits, reaching the required voltage threshold for optical readout. As a second part of this thesis, I set up a basis to conduct cryogenic heat transport simulations and present an interfacing circuit that incorporates a self-regulated electro- thermal switch. Finally, I fabricate and measure integrated chips to extract resistances of cryogenic thin-film resistors and critical currents of thin-film superconducting devices.