netket.operator.boson.proj

netket.operator.boson.proj(hilbert, site, n, dtype=<class 'float'>)

Builds the projector operator \(|n\rangle\langle n |\) acting on the site-th of the Hilbert space hilbert and collapsing on the state with n bosons.

If hilbert is a non-Bosonic space of local dimension M, it is considered as a bosonic space of local dimension M.

Parameters:

• hilbert (DiscreteHilbert) – The hilbert space.

• site (int) – The site on which this operator acts.

• dtype (Union[None, str, type[Any], dtype, _SupportsDType]) – The datatype to use for the matrix elements.

• n (int)

Return type:

LocalOperator

Returns:

An instance of {class}`nk.operator.LocalOperator`.