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Zel'dovich Amplification in a Superconducting Circuit.

Maria Chiara Braidotti1, Andrea Vinante2,3, Giulio Gasbarri2

  • 1School of Physics and Astronomy, University of Glasgow, G12 8QQ Glasgow, United Kingdom.

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|October 16, 2020
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Researchers propose a novel experiment to demonstrate Zel

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Area of Science:

  • Physics
  • Electromagnetism
  • Quantum Optics

Background:

  • The Zel'dovich effect predicts amplification of electromagnetic (EM) waves with angular momentum reflected from a rotating metallic cylinder.
  • Experimental verification has been challenging due to the requirement for mechanical rotation frequencies to match EM oscillation frequencies.

Purpose of the Study:

  • To propose a feasible experimental approach for demonstrating Zel'dovich amplification.
  • To overcome the frequency matching limitations of previous experimental proposals.

Main Methods:

  • Designing a superconducting circuit with low-frequency EM modes.
  • Coupling these EM modes to a magnetically levitated, spinning microsphere.
  • Theoretically estimating the EM mode gain within the circuit.

Main Results:

  • Theoretical estimation of measurable Zel'dovich amplification.
  • Demonstration of amplification through the rotation of the microsphere.

Conclusions:

  • The proposed experimental setup offers a viable pathway for the first direct EM-field demonstration of Zel'dovich amplification.
  • This work leverages superconducting circuit technology to overcome previous experimental hurdles.