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Related Experiment Video

Updated: Feb 21, 2026

The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
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Development of a Superconducting Differential Double Contour Interferometer.

Vladimir L Gurtovoi1,2, Vladimir N Antonov2,3, Alexey V Nikulov1

  • 1Institute of Microelectronics Technology and High Purity Materials, Russian Academy of Sciences , 142432 Chernogolovka, Moscow District Russia.

Nano Letters
|October 10, 2017
PubMed
Summary

We introduce the superconducting differential double contour interferometer (DDCI) for ultrasensitive magnetic flux detection and superconducting flux qubit readout. This novel device shows potential to surpass traditional superconducting quantum interference devices.

Keywords:
Josephson junctionSQUIDmagnetometersuperconductivity

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Area of Science:

  • Quantum Computing
  • Superconducting Devices
  • Quantum Metrology

Background:

  • Superconducting devices are crucial for quantum technologies.
  • Accurate detection of magnetic flux is essential for qubit manipulation.
  • Existing devices like SQUIDs have limitations in sensitivity and readout.

Purpose of the Study:

  • To investigate the operational principles of the superconducting differential double contour interferometer (DDCI).
  • To evaluate the DDCI's performance for ultrasensitive magnetic flux detection.
  • To assess the DDCI's suitability for digital readout of superconducting flux qubit states.

Main Methods:

  • Fabrication and characterization of the DDCI device.
  • Utilizing Josephson junctions for weak coupling between superconducting contours.
  • Analyzing the step-like changes in critical current due to magnetic flux variations.

Main Results:

  • Demonstrated the DDCI's functionality in detecting magnetic flux.
  • Observed step-like changes in critical current corresponding to quantum number changes.
  • Showcased the potential for digital readout of flux qubit states.

Conclusions:

  • The DDCI is a promising new device for ultrasensitive magnetic flux detection.
  • The DDCI offers a potential advantage over traditional superconducting quantum interference devices.
  • The DDCI facilitates digital readout for superconducting flux qubits.