Qubit Zoo

Protected gates for superconducting qubits

1 min read

Proposes the 0-π qubit: a superconducting circuit with two degenerate ground states protected by a combination of disjoint charge and flux noise immunity. The circuit uses a superinductance and a pair of Josephson junctions to create a potential that is periodic in 2π but with two inequivalent minima at φ = 0 and φ = π.

Key Results

  • Protection against both charge and flux noise at the Hamiltonian level
  • Qubit splitting exponentially small in circuit parameters
  • Requires superinductance >1 μH (challenging but achievable)
  • Related to the cos(2φ) qubit family

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