Struct DensityMatrix 

pub struct DensityMatrix {
    pub rho: Vec<Complex<f32>>,
    pub dim: usize,
}

Density matrix ρ stored as a row-major dim×dim complex matrix.

Fields

rho: Vec<Complex<f32>>

dim: usize

Implementations

impl DensityMatrix

pub fn from_pure_state(sv: &StateVector) -> Self

Construct ρ = |ψ⟩⟨ψ| from a pure state vector.

pub fn apply_unitary( &mut self, u: &[Complex<f32>], dim: usize, ) -> QuantumResult<()>

Apply a unitary U: ρ’ = U ρ U†.

pub fn trace(&self) -> Complex<f32>

Trace Tr(ρ) = Σ_i ρ[i,i].

pub fn trace_sq(&self) -> Complex<f32>

Tr(ρ²) used for purity calculation.

Trait Implementations

impl Clone for DensityMatrix

fn clone(&self) -> DensityMatrix

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for DensityMatrix

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

Formats the value using the given formatter.