Regensburg 2022 – scientific programme

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QI: Fachverband Quanteninformation

QI 4: Poster: Quantum Information

QI 4.38: Poster

Monday, September 5, 2022, 18:00–20:00, P2

Nb/AlOx/Nb-trilayer based Dimer Josephson Junction Array Amplifiers — Judi Parvizinejad¹, Fabian Kaap¹, Sergey Lothkov¹, Christoph Kissling¹, Victor Gaydamachenko¹, Marat Khabipov¹, •Mark Bieler¹, and Lukas Grünhaupt^1,2 — ¹Physikalisch-Technische Bundesanstalt, Department Quantum Electronics, 38116 Braunschweig, Germany — ²Physikalisch-Technische Bundesanstalt, Quantum Technology Competence Center, 38116 Braunschweig, Germany

Josephson parametric amplifiers are crucial components for superconducting quantum circuits as they enable high fidelity readout of qubits by improving the signal-to-noise ratio. Among them, Dimer Josephson Junction Array Amplifiers (DJJAA) [1] have shown promise as user-friendly devices with gain on the order of 20 dB, low added noise, saturation powers larger than approximately -110 dBm, and non-degenerate amplification over a bandwidth of up to ~10 MHz. Due to the use of dc-SQUIDS and multiple dimer modes the operating frequency can be tuned in the range of 2-10 GHz. Using results obtained on DJJAAs with Al/AlOx/Al Josephson junctions as a baseline, we present our progress towards realizing DJJAAs with Nb/AlOx/Nb-trilayer Josephson junctions. We will discuss the circuit design, our fabrication processes, and show preliminary cryogenic measurements of the device.

[1] P. Winkel et al., Phys. Rev. Applied 13, 024015 (2020)