Dresden 2011 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 60: SC \& MLT: Cryodetectors
TT 60.4: Talk
Friday, March 18, 2011, 11:30–11:45, HSZ 301
Cryogenic single-photon detector on the base of a S-I-N-I-S type single-electron trap — •Sergey V. Lotkhov1, Antti Kemppinen2, Olli-Pentti Siara3, Jukka P. Pekola3, and Alexander B. Zorin1 — 1Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Brausnchweig — 2Centre for Metrology and Accreditation (MIKES), P.O. Box 9, 02151 Espoo, Finland — 3Low Temperature Laboratory, Aalto University, P.O. Box 13500, FI-00076 AALTO, Finland
For a long time, extremely high sensitivity of the single-electron circuits in respect to their electromagnetic environment was considered as a bottle neck for realization of a quantum current standard. For example, our recent experiments with the so-called hybrid superconductor-normal metal electron turnstiles on the base of Al and AuPd revealed an inherent relation of the pumping accuracy to the quality of noise filtering for such a device. In the current work, we generalize the task and regard our single-electron trapping circuit as a detector of single noise quanta, reaching the sample even in a well-filtered cryogenic setup at T ∼ 100 mK. Owing to simplicity of the hybrid approach: our trap is built on a basic two-junction hybrid device controlled by a single gate, we can characterize not only the average noise level, but to conclude on the noise spectrum of the particular setup as well, on the frequency scale around f ∼ (Ec + Δ)/h ∼100-200 GHz, where Ec is the charging energy barrier in the trap, and Δ is a superconducting energy gap of Al.