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Exponential suppression of bit-flips in a qubit encoded in an oscillator

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Demonstrates exponential suppression of bit-flip errors in a dissipatively stabilized cat qubit using a superconducting circuit. The two-photon driven-dissipative process confines the oscillator to a manifold of two coherent states, with bit-flip rate decreasing exponentially as the cat size grows.

Key Results

  • Bit-flip time: >10 s (extrapolated) at n̄ ≈ 5
  • Phase-flip time: ~1 μs (trades off against bit-flip suppression)
  • Uses engineered two-photon dissipation via a buffer mode
  • First experimental confirmation of exponential bit-flip suppression in a cat qubit

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