Bulletin of the American Physical Society
2024 APS March Meeting
Monday–Friday, March 4–8, 2024; Minneapolis & Virtual
Session A52: Novel Approaches to Quantum Sensing and Simulations
8:00 AM–10:12 AM,
Monday, March 4, 2024
Room: 201AB
Sponsoring
Unit:
DQI
Chair: Akshay Koottandavida, Yale University
Abstract: A52.00004 : Shaping dual Shapiro steps in Josephson junctions using tailored drives
8:36 AM–8:48 AM
Presenter:
Fabian Kaap
(Physikalisch-Technische Bundesanstalt)
Authors:
Fabian Kaap
(Physikalisch-Technische Bundesanstalt)
Christoph Kissling
(Physikalisch-Technische Bundesanstalt)
Victor Gaydamachenko
(Physikalisch-Technische Bundesanstalt)
Lukas Grünhaupt
(Physikalisch-Technische Bundesanstalt)
Sergey Lotkhov
(Physikalisch-Technische Bundesanstalt)
We integrate a dc-SQUID into a high-impedance environment composed of granular aluminum and oxidized titanium to suppress the quantum fluctuations of charge, which would otherwise prevent the occurrence of quantized current steps. First, we demonstrate dual Shapiro steps using an external rf drive with frequencies up to 6 GHz, resulting in current steps up to 2ef ≈ 2 nA. By applying a sawtooth waveform instead of the initially used sinusoidal one the first dual Shapiro step is either enhanced or suppressed, depending on the sign of the sawtooth. When comparing the differential resistance Rdiff of the enhanced dual Shapiro step with a step generated by a sinusoidal drive, we observe an increase of Rdiff by a factor of ≈ 2.
[1] K. K. Likharev and A. B. Zorin, J. Low Temp. Phys. 59, 347 (1985).
[2] R. S. Shaikhaidarov et al., Nature 608, 45–49 (2022).
[3] N. Crescini et al., Nat. Phys. 19, 851–856 (2023).
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