Qubit Zoo

Dynamically protected cat-qubits: a new paradigm for universal quantum computation

1 min read

Proposes the cat code paradigm: encoding a qubit in coherent state superpositions of a harmonic oscillator, stabilized by engineered two-photon dissipation. Shows that bit-flip errors are exponentially suppressed with cat size while phase-flip errors grow only polynomially, creating a strongly biased noise channel exploitable by concatenated codes.

Key Results

  • Qubit states: |±α⟩ (even/odd cat states)
  • Bit-flip suppression: exponential in |α|²
  • Phase-flip rate: linear in |α|² (κ_1)
  • Universal gate set via concatenation with repetition code

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