MajoranaPropagator

Initial operator, either a monoprop.majorana.MajoranaOperator or an object implementing get_majorana_operator().

Slater determinant (occupied mode indices) for the initial state.

Truncation parameter controlling the maximum complexity of the Majorana monomials retained during evolution; its meaning depends on cutoff_type. Higher values increase accuracy at greater cost. A fully paired monomial -- one whose support consists entirely of complete pairs $(m_{2j-1} m_{2j})$ on a mode -- is always kept regardless of this cutoff, because only paired monomials can contribute to an expectation value against a computational-basis state or Slater determinant; discarding them would throw away signal.

Selects and configures Schrodinger-picture evolution. If None (default), the simulator runs in the Heisenberg picture. If an integer is provided, the simulator runs in the Schrodinger picture and this value is used as the truncation limit for the evolved state (including initialization from initial_state), using the same complexity notion as cutoff_type. In practice, choose schrodinger_cutoff at least as large as cutoff (often slightly larger) for comparable accuracy.

Truncation scheme (the fully-paired exception above always applies on top of either). "length" (default) keeps monomials whose length -- the number of Majorana operators -- does not exceed cutoff; "support" keeps monomials acting on at most cutoff distinct orbitals (their orbital support).

Optional lower absolute-tolerance threshold for coefficient truncation. Monomials with |coeff| \< lower_atol are discarded during evolution to improve performance.

Optional upper absolute-tolerance threshold. Monomials with |coeff| > upper_atol are always retained regardless of their complexity, overriding cutoff-based truncation.

Optional MPI communicator. The communicator must remain valid for the simulator's lifetime.