Qubit Zoo

Coherent control of macroscopic quantum states in a single-Cooper-pair box

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First observation of coherent quantum oscillations in a superconducting circuit (Cooper pair box). This is the founding experiment of superconducting quantum computing — demonstrated that macroscopic electrical circuits can exhibit quantum coherence.

Key Results

  • Coherent Rabi oscillations between charge states of a CPB
  • Oscillation period ~0.15 ns, decay time ~2 ns
  • Operated at charge degeneracy point
  • Established superconducting circuits as a viable qubit platform

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