quspin.tools.measurements.ent_entropy

quspin.tools.measurements.ent_entropy(system_state, basis, chain_subsys=None, DM=False, svd_return_vec=[False, False, False], **_basis_kwargs)[source]

DEPRECATED (cf basis.ent_entropy). Calculates entanglement entropy of a subsystem using Singular Value Decomposition (svd).

Note: we recommend the use of the “basis.ent_entropy()” method instead of this function. This function is now deprecated!