Struct QuantumSubspaceExpansion 

pub struct QuantumSubspaceExpansion {
    pub expansion_basis: Vec<Array1<Complex64>>,
    pub num_qubits: usize,
}

Quantum Subspace Expansion for error mitigation

Expands the computation into a larger Hilbert space that includes error states, then projects back to extract error-mitigated results.

Reference: McClean et al. (2020). “Decoding quantum errors with subspace expansions”

Fields

expansion_basis: Vec<Array1<Complex64>>

Basis states for the expanded subspace

num_qubits: usize

Number of qubits

Implementations

impl QuantumSubspaceExpansion

pub fn new(num_qubits: usize) -> Self

Create a new QSE instance

pub fn generate_excitation_basis(&mut self, num_excitations: usize)

Generate expansion basis including single-excitation operators

pub fn compute_coefficients( &self, noisy_state: &Array1<Complex64>, ) -> Result<Array1<f64>, QuantRS2Error>

Compute subspace expansion coefficients

pub fn reconstruct_state( &self, coefficients: &Array1<f64>, ) -> Result<Array1<Complex64>, QuantRS2Error>

Reconstruct mitigated state from subspace expansion

Trait Implementations

impl Clone for QuantumSubspaceExpansion

fn clone(&self) -> QuantumSubspaceExpansion

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for QuantumSubspaceExpansion

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

Formats the value using the given formatter.