Struct Dephasing 

pub struct Dephasing {
    pub support: [u32; 1],
    pub p: f64,
}

Single-qubit dephasing noise with error probability p.

Heisenberg dual: E*(P) = (1-p) P + p Z P Z. So I and Z are preserved; X and Y are scaled by 1 - 2p (Z·X·Z = -X, Z·Y·Z = -Y). Equivalently, the scale fires iff the support qubit’s x_bit is set. Self-adjoint.

Fields

support: [u32; 1]

The single qubit this channel acts on.

p: f64

Error probability p ∈ [0, 1].

Trait Implementations

impl<const W: usize> Channel<W> for Dephasing

fn max_fanout(&self) -> usize

Maximum number of output terms produced per input term. Used by the engine to size the scratch buffer up-front.

fn support(&self) -> &[u32]

Qubits this channel acts on. Outputs differ from inputs only at these bit positions; the engine uses this for bucket layout (§5).

fn apply( &self, input_x: &[u64; W], input_z: &[u64; W], coeff: Complex64, out: &mut OutputBuffer<'_, W>, )

Apply the channel to a single input term, writing outputs to out.

fn apply_adjoint( &self, input_x: &[u64; W], input_z: &[u64; W], coeff: Complex64, out: &mut OutputBuffer<'_, W>, )

Apply the channel’s adjoint to a single input term, writing outputs to out. Used by the engine in Direction::Heisenberg mode for backpropagating observables.