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Superconducting quantum interference device readout circuit with tunable feedback polarity.

Xinyu Wu1, Jianshe Liu1, Wei Chen1,2,3

  • 1Laboratory of Superconducting Quantum Information Processing, School of Integrated Circuits, Tsinghua University, Beijing 100084, People's Republic of China.

The Review of Scientific Instruments
|September 28, 2023
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Summary
This summary is machine-generated.

This study introduces a tunable feedback polarity (TFP) circuit for superconducting quantum interference device (SQUID) readout. This innovation enhances SQUID performance and enables compact, versatile SQUID electronics.

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Area of Science:

  • Superconducting electronics
  • Quantum device readout

Background:

  • Feedback circuits are crucial for high-performance superconducting quantum interference device (SQUID) readout.
  • Positive feedback suppresses noise, while negative feedback expands the linear flux range.
  • Integrating diverse feedback functions onto a single SQUID chip is key for compact SQUID electronics.

Purpose of the Study:

  • To propose a novel SQUID readout circuit with tunable feedback polarity (TFP).
  • To enable easy switching of feedback polarity using integrated superconducting switches.
  • To develop a compact and versatile SQUID readout architecture.

Main Methods:

  • Implementation of a SQUID readout circuit with integrated superconducting switches for polarity control.
  • Application of a control current to switch feedback polarity.
  • Introduction of a two-stage scheme to mitigate noise degradation from negative feedback.

Main Results:

  • The tunable feedback polarity (TFP) circuit allows for easy switching between positive and negative feedback.
  • The choice of feedback polarity directly influences the enhancement of the flux-to-voltage transfer coefficient or linear flux range.
  • The two-stage scheme effectively addresses noise performance issues associated with negative feedback.

Conclusions:

  • The proposed TFP SQUID readout circuit offers enhanced performance and versatility.
  • This architecture facilitates the development of highly compact SQUID electronics.
  • The use of compatible superconducting technologies ensures a robust and adaptable design for advanced SQUID applications.