Function bra_ket_transitions 

pub fn bra_ket_transitions<B>(
    basis: &B,
    operator: &str,
    sites: &[usize],
    coefficient: impl Into<Complex64>,
    kets: impl IntoIterator<Item = B::State>,
) -> Result<Vec<BraKetTransition<B::State>>>
where
    B: Basis,

Raw local transition table, including branching callbacks and fermionic signs.