Science Advances

Supplementary Materials

This PDF file includes:

  • I. Degenerate and nondegenerate parametric amplification
  • II. The double-well potential
  • III. Pump phase
  • fig. S1. Experimentally measured degenerate and nondegenerate parametric amplification of both modes in the electromechanical system.
  • fig. S2. The double-well potential underpinning a parametric resonance.
  • fig. S3. The pump phase dependence of the two-mode squeezing.

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