Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 16: Poster Session Superconductivity, Cryogenic Particle Detectors, Cryotechnique

TT 16.24: Poster

Montag, 16. März 2020, 15:00–19:00, P2/EG

Towards direct on-chip spectroscopy of the Bloch oscillations in a small Josephson junction — •Sergey Lotkhov — Physikalisch-Technische Bundesanstalt, Bundesallee 100, D-38116 Braunschweig

In our presentation, we address an experimental design which should make it possible to directly detect and to measure the linewidth of Bloch oscillations in a small Josephson junction. A dual experiment has been recently reported by our group [1] in respect to the Josephson radiation transmitted via a SQUID-tunable coplanar waveguide (CPW) to a photon-assisted tunneling (PAT) detector fabricated on the same on-chip. Single-photon-state readout has been demonstrated for the microwave frequencies around 80 GHz. In the new design, the source of oscillations is realized as a Bloch junction embedded into reactive high-impedance environment. The oscillations are coupled weakly to a sharp CPW resonant mode within the Bloch frequency range of 15-30 GHz. We discuss the experimental challenges and the promising solutions which we are about to deal with in the new experiments. In particular, we address our recent progress towards lower-threshold PAT detectors and highly transparent Bloch junctions. Furthermore, we will briefly overview the expected impact of the known stray mechanisms, like Landau-Zener tunneling or electron heating, on the oscillations linewidth for the scope of feasible parameters.

[1] S. V. Lotkhov et al., Appl. Phys. Lett. 115, 192601 (2019)

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