Function entanglement_entropy_sector 

pub fn entanglement_entropy_sector<State>(
    amplitudes: &[Complex64],
    basis_states: &[State],
    total_sites: usize,
    retained_sites: &[usize],
    noncommuting_groups: &[NoncommutingGroup],
    order: EntropyOrder,
) -> Result<f64>
where
    State: BinaryState,

Entanglement entropy of a pure state represented in a binary sector.