Struct ObservableCalculator 

pub struct ObservableCalculator { /* private fields */ }

High-performance observable calculator with GPU support

Implementations

impl ObservableCalculator

pub fn new() -> Self

Create a new observable calculator with default configuration

pub fn with_config(config: ObservableConfig) -> Self

Create with custom configuration

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

Compute expectation value ⟨ψ|O|ψ⟩ for a Pauli observable

pub fn hamiltonian_expectation_value( &self, state: &Array1<Complex64>, hamiltonian: &PauliHamiltonian, ) -> Result<Complex64>

Compute expectation value for a Hamiltonian (sum of Pauli terms)

pub fn variance( &self, state: &Array1<Complex64>, observable: &PauliObservable, ) -> Result<f64>

Compute variance Var(O) = ⟨O²⟩ - ⟨O⟩²

pub fn batch_expectation_values( &self, state: &Array1<Complex64>, observables: &[PauliObservable], ) -> Result<Vec<Complex64>>

Batch compute multiple expectation values in parallel

Trait Implementations

impl Default for ObservableCalculator

fn default() -> Self

Returns the “default value” for a type.