Struct PauliString 

pub struct PauliString {
    pub operators: Vec<PauliOp>,
    pub coefficient: Complex64,
}

Pauli string representation of a quantum operator

Fields

operators: Vec<PauliOp>

Pauli operators for each qubit

coefficient: Complex64

Overall coefficient

Implementations

impl PauliString

pub fn expectation_value(&self, state: &Array1<Complex64>) -> Complex64

Compute expectation value <ψ|P|ψ> for this Pauli string

pub fn apply_to_state(&self, state: &Array1<Complex64>) -> Array1<Complex64>

Apply Pauli string (scaled by its coefficient) to a quantum state.

Returns c · P |ψ⟩, where c is PauliString::coefficient. Qubit k corresponds to bit k of the state-vector index (little-endian), matching the bit-mask convention used throughout the crate.

pub fn commutator_with_hamiltonian( &self, hamiltonian: &MolecularHamiltonian, state: &Array1<Complex64>, ) -> Complex64

Compute commutator [H, P] where H is the Hamiltonian

Trait Implementations

impl Clone for PauliString

fn clone(&self) -> PauliString

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for PauliString

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.