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Experimental evidence for a current-biased Josephson junction acting as either a macroscopic boson or fermion

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This experiment revisited the bias-controlled spectrum of a quantized current-biased Josephson junction, observing a crossover from nearly harmonic-oscillator behavior at low bias to a strongly nonlinear two-level artificial-atom regime near critical current.

Key Results

  • Fabricated and characterized current-biased Josephson-junction devices at 50 mK
  • Observed a 2.5949 GHz plasma resonance with at zero bias
  • Confirmed strong spectral nonlinearity near

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