Qubit Zoo

Rabi Oscillations in a Large Josephson-Junction Qubit

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First demonstration of coherent Rabi oscillations in a current-biased Josephson junction (phase qubit). The qubit states are the two lowest energy levels in the tilted washboard potential of a large-area junction.

Key Results

  • Coherent Rabi oscillations with T_Rabi ~ 20 ns
  • Phase qubit: |0⟩ and |1⟩ are levels in anharmonic washboard potential
  • Readout via tunneling: |1⟩ tunnels to voltage state, |0⟩ stays trapped
  • Junction area: ~10 μm² (large by modern standards)

Graph View

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