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nanoSQUID operation using kinetic rather than magnetic induction.

Adam N McCaughan1, Qingyuan Zhao1, Karl K Berggren1

  • 1Massachusetts Institute of Technology, Dept. of EECS, 77 Massachusetts Ave, Cambridge, MA 02139, USA.

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This study introduces a new nanoSQUID modulation technique using kinetic inductance for fluxoid state control. This method enables smaller superconducting electronics and simplifies thin-film characterization.

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Area of Science:

  • Superconducting electronics
  • Quantum device physics
  • Materials science

Background:

  • Superconducting Quantum Interference Devices (SQUIDs) are crucial for sensitive magnetic field detection.
  • Traditional SQUID modulation relies on magnetic inductance, limiting miniaturization.
  • Controlling the internal fluxoid state is key to SQUID operation.

Purpose of the Study:

  • To develop a novel nanoSQUID modulation method utilizing kinetic inductance.
  • To demonstrate current injection for manipulating the fluxoid state, bypassing magnetic fields.
  • To explore the potential for miniaturizing SQUID-based superconducting electronics.

Main Methods:

  • Implementation of nanoSQUID modulation based on kinetic inductance.
  • Utilizing injected current to modulate the internal fluxoid state.
  • Observing critical current modulation and its periodicity.

Main Results:

  • Successful modulation of the nanoSQUID using kinetic inductance via current injection.
  • Observed triangle-wave modulation of critical current, periodic with fluxoid quantization.
  • Confirmed manipulation of the superconducting loop's fluxoid state primarily through kinetic inductance.

Conclusions:

  • Kinetic inductance modulation offers a viable alternative to magnetic inductance for nanoSQUIDs.
  • This approach significantly reduces the size of coupling inductors (by 10x).
  • The method facilitates the development of smaller SQUID-based electronics and aids in kinetic inductance characterization.