Background Noise Processes

For each subsystem (slot in the register), you also specify what background processes and noise parameters describe it. For instance, it could be a T1Decay or T2Dephasing process, or a coherent error, or a non-Markovian bath. It is supported by all backends (but maybe with twirling, e.g. to support T1Decay in a Clifford simulation).

Currently we implement:

┌──────────────────┬────────────────────────────────────────────────────────────────────────────────┐
│             type │                                                                            doc │
├──────────────────┼────────────────────────────────────────────────────────────────────────────────┤
│ AmplitudeDamping │   A depolarization background.                                                 │
│   Depolarization │   A depolarization background.                                                 │
│                  │                                                                                │
│                  │   The τ parameter specifies the average time between depolarization events     │
│                  │   (assuming a Poisson point process). I.e. after time t the probability for an │
│                  │   depolarization event is 1-exp(-t/τ).                                         │
│       PauliNoise │   A Pauli noise background.                                                    │
│          T1Decay │   A background describing the T₁ decay of a two-level system.                  │
│      T2Dephasing │   A background describing the T₂ dephasing of a two-level system.              │
└──────────────────┴────────────────────────────────────────────────────────────────────────────────┘

If you want to introspect these noise processes, you can use the paulinoise, krausops, and lindbladop functions.