Driving a low critical current Josephson junction array with a mode-locked laser

We demonstrate the operation of Josephson junction arrays (JJA) driven by optical pulses generated by a mode-locked laser and an optical time-division multiplexer. A commercial photodiode converts the optical pulses into electrical ones in liquid helium several cm from the JJA. The performance of ou...

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Bibliographic Details
Published in:arXiv.org 2020-09
Main Authors: Nissila, J, dell, T, Kohopaa, K, Mykkanen, E, Immonen, P, Jabradaghi, R N, Bardalen, E, Kieler, O, Karlsen, B, Ohlckers, P A, Behr, R, Manninen, A J, Govenius, J, Kemppinen, A
Format: Article
Language:English
Subjects:
Critical current (superconductivity)
Josephson junctions
Laser arrays
Laser mode locking
Lasers
Liquid helium
Optical pulses
Photodiodes
Synthesizers
Waveforms
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Summary:We demonstrate the operation of Josephson junction arrays (JJA) driven by optical pulses generated by a mode-locked laser and an optical time-division multiplexer. A commercial photodiode converts the optical pulses into electrical ones in liquid helium several cm from the JJA. The performance of our custom-made mode-locked laser is sufficient for driving a JJA with low critical current at multiple Shapiro steps. Our optical approach is a potential enabler for fast and energy-efficient pulse drive without expensive high-bandwidth electrical pulse pattern generator, and without high-bandwidth electrical cabling crossing temperature stages. Our measurements and simulations motivate an improved integration of photodiodes and JJAs using, e.g., flip-chip techniques, in order to improve both the understanding and fidelity of pulse-driven Josephson Arbitrary Waveform Synthesizers (JAWS).
ISSN:2331-8422
DOI:10.48550/arxiv.2009.12352