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Supercurrent time division multiplexing with solid-state integrated hybrid superconducting electronics.

Alessandro Paghi1, Laura Borgongino2, Simone Tortorella2,3

  • 1Istituto Nanoscienze-CNR and Scuola Normale Superiore, Piazza San Silvestro 12, Pisa, Italy. alessandro.paghi@nano.cnr.it.

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This summary is machine-generated.

Time-division multiplexing of cryogenic signals was achieved using novel superconducting demultiplexers. This advance enables more efficient measurement of quantum devices by reducing space and cooldown times.

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Area of Science:

  • Quantum Computing
  • Superconducting Devices
  • Cryogenic Engineering

Background:

  • Multiplexing cryogenic signals is crucial for scaling quantum device measurements.
  • Current methods face limitations in space, cooldown time, and device density.
  • Efficient signal routing is essential for complex quantum systems.

Purpose of the Study:

  • To demonstrate time-division multiplexing of non-dissipative supercurrents.
  • To develop and test voltage-controlled hybrid superconducting demultiplexers.
  • To improve the efficiency and scalability of cryogenic quantum measurements.

Main Methods:

  • Fabrication of superconducting Josephson Field Effect Transistors (JoFETs) with Al electrodes, InAs channels, and HfOx gate insulators.
  • Integration of JoFETs into voltage-controlled hybrid superconducting demultiplexers.
  • Characterization of demultiplexer performance at 50 mK, including switching current suppression, resistance increase, signal frequency, switching frequency, insertion loss, and ON/OFF ratio.

Main Results:

  • Each JoFET suppressed switching current and increased resistance 20-fold at -4.5 V gate voltage.
  • An 8-output demultiplexer operated up to 100 MHz signal frequency and 100 kHz switching frequency with a ±2 μA input range.
  • Near-zero insertion loss and a 17.5 dB ON/OFF ratio were achieved.
  • Optimized layout extended operation to 4 GHz with a 2-output demultiplexer.

Conclusions:

  • Time-division multiplexing of supercurrents is feasible using hybrid superconducting demultiplexers.
  • The developed JoFETs and demultiplexers offer significant improvements in cryogenic signal routing.
  • This technology paves the way for more scalable and efficient quantum computing architectures.