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A radiofrequency voltage-controlled current source for quantum spin manipulation.

D S Barker1, A Restelli1, J A Fedchak2

  • 1Joint Quantum Institute, University of Maryland and National Institute of Standards and Technology, College Park, Maryland 20742, USA.

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Summary
This summary is machine-generated.

This study introduces a compact, low-power radiofrequency current source with current feedback. It delivers high currents over a wide bandwidth, ideal for quantum sensors and nuclear magnetic resonance.

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Area of Science:

  • Electrical Engineering
  • Physics
  • Quantum Sensing

Background:

  • Radiofrequency (RF) magnetic field coils are crucial for applications like nuclear magnetic resonance (NMR) and quantum sensing.
  • Controlling current in RF coils presents challenges due to frequency-dependent impedance.

Purpose of the Study:

  • To develop a wide-bandwidth, voltage-controlled current source for RF magnetic field coils.
  • To enable integration with deployable quantum sensors and NMR systems.

Main Methods:

  • Designed a current source utilizing current feedback to counteract frequency-dependent impedance.
  • Integrated the current source onto a compact printed circuit board (< 4 cm²).

Main Results:

  • Achieved peak currents > 100 mA across a 300 kHz to 54 MHz frequency range.
  • The device operates at low power (< 1.3 W).

Conclusions:

  • The developed RF current source is a versatile, efficient solution for RF coil control.
  • Its compact size and performance make it suitable for portable quantum sensing and NMR applications.