Struct AmplitudeDamping 

pub struct AmplitudeDamping {
    pub support: [u32; 1],
    pub gamma: f64,
}

Single-qubit amplitude damping with parameter gamma.

The only noise in the built-in set with genuine fan-out > 1. Heisenberg dual via Kraus operators E_0 = |0⟩⟨0| + √(1-γ)|1⟩⟨1| and E_1 = √γ |0⟩⟨1|:

• I → I
• X → √(1-γ) X
• Y → √(1-γ) Y
• Z → (1-γ) Z + γ I (the only fanout-2 case)

Not self-adjoint in general — the Heisenberg adjoint of amplitude damping is not amplitude damping itself. v0.1 uses the default apply_adjoint = apply placeholder; users propagating in Direction::Heisenberg mode with this channel should be aware of that approximation. (The non-Heisenberg use-case is the common one and is exact.)

Fields

support: [u32; 1]

The single qubit this channel acts on.

gamma: f64

Damping parameter γ ∈ [0, 1]. The amplitude that escapes to the |0⟩ state per application.

Trait Implementations

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

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.