Science Advances

This PDF file includes:

• section S1. Derivation of the circuit Hamiltonian
  
• section S2. Readout and dissipation
  
• section S3. Two coupled parametric oscillators
  
• section S4. Robustness to decoherence
  
• section S5. Quantum trajectory comparison between CVIM and QA
  
• section S6. Parameter estimates
  
• section S7. Typical quantum trajectories for the NPP
  
• fig. S1. Illustration of a superconducting quantum interference device–based KPO
  circuit.
  
• fig. S2. Schematics of a multiply connected circuit with logarithmically extended
  tunability.
  
• fig. S3. Highest part of the eigenspectrum of two coupled parametric oscillators in
  the rotating frame.
  
• fig. S4. Populations of the seven highest eigenstates as a function of the
  normalized ramp rate.
  
• fig. S5. Stability diagram for the symmetric mode when J > 0.
  
• fig. S6. Logarithmic negativity of the two-mode Gaussian state during annealing.
  
• fig. S7. Conditional success probability conditioned on the total number of jumps.
  
• fig. S8. Conditional success probability conditioned on the total number of jumps
  (N = 6) and conditioned on the number of jumps in a given oscillator.
  
• fig. S9. Effect of dephasing on the discrete qubit QA.
  
• fig. S10. Ratio of ac amplitudes as a function of c₁ = cos(Φ^dc₁ ) .
  
• fig. S11. Conditional expectation values of the interoscillator phase correlations
  for ε=100 .
  
• fig. S12. Conditional expectation values of the interoscillator phase correlations
  for ε=15 .
  
• fig. S13. Conditional expectation values of the interoscillator phase correlations
  for ε=3.
  
• References (52, 53, 56–61)

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