Save state together with its reference samples and log-probabilities.
The archive contains {key: state, "reference": SamplesWithProb(...)}, so
it can later be turned into an ISState
via ISState.from_nqxpack() without re-sampling.
- Parameters:
path (str) – Destination .nk path.
state – A sampled variational state (MCState / FoundationalQuantumState).
key (str) – Key under which the state is stored (default "state").
- Return type:
None