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Experimental studies of flux solitons in reversible logic gates

ORAL

Abstract

Reversible digital logic gates can provide a fundamental advantage in energy efficiency compared to industrial gates which are irreversible. Here we design and measure 1-bit gates implemented in superconducting circuits. The gate consists of Long Josephson junctions (LJJs) connected by a circuit interface. The gate interface includes large shunting capacitors, which is key for the resonant conservative dynamics in the gates. The dynamics of the scattering process, originally discovered in full numerical simulation, is understood using collective coordinate analysis [1,2]. Depending on the interface parameters, the gate dynamics realize different gate operations that may preserve or change the fluxon polarity, as an Identity or NOT gate. The LJJ circuit layout uses niobium trilayer short junctions with connecting wiring for inductors. We plan to experimentally study how well a fluxon can travel ballistically towards the gate, and scatter to another LJJ with the designed change in flux polarity (bit state).
[1] W. Wustmann, and K. D. Osborn, arXiv:1711.04339 (2018)
[2] K. D. Osborn and W. Wustmann, In: Kari J., Ulidowski I. (eds) Reversible Computation. RC 2018. Lecture Notes in Computer Science, vol 11106. Springer, Cham (2018).

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Presenters

  • Liuqi Yu

    Department of Physics, University of Basel, The Laboratory for Physical Sciences, University of Maryland, USA

Authors

  • Liuqi Yu

    Department of Physics, University of Basel, The Laboratory for Physical Sciences, University of Maryland, USA

  • Waltraut Wustmann

    The Laboratory for Physical Sciences, University of Maryland, USA, LPS at the University of Maryland, College Park

  • Kevin Osborn

    University of Maryland, College Park, The Laboratory for Physical Sciences, University of Maryland, USA, Laboratory of Physical Science, LPS at the University of Maryland, College Park