Function quest_bind::calc_density_inner_product

pub fn calc_density_inner_product(
    rho1: &Qureg<'_>,
    rho2: &Qureg<'_>
) -> Result<Qreal, QuestError>

Computes the Hilbert-Schmidt scalar product.

Examples

let env = QuestEnv::new();
let qureg = Qureg::try_new_density(2, &env)
    .expect("cannot allocate memory for Qureg");
let other_qureg = {
    let mut other_qureg = Qureg::try_new_density(2, &env)
        .expect("cannot allocate memory for Qureg");
    other_qureg.init_plus_state();
    other_qureg
};

let prod = calc_density_inner_product(&qureg, &other_qureg).unwrap();
assert!((prod - 0.25).abs() < EPSILON);

See QuEST API for more information.