Module channel 

Quantum channel models for networking protocols.

Provides Kraus-operator-based single-qubit channel primitives (depolarizing, dephasing, amplitude damping) used by BB84, E91, and quantum teleportation simulations.

Structs

AmplitudeDampingChannel

Amplitude damping channel (spontaneous emission) with decay rate gamma.

DephazingChannel

Dephasing (phase-flip) channel with probability p.

DepolarizingChannel

Depolarizing channel with probability p.

Traits

NoiseChannel

A single-qubit quantum channel acting on a density matrix ρ.

Functions

fidelity_pure

Compute the fidelity F = ⟨ψ|ρ|ψ⟩ for a pure target state |ψ⟩.

ket_minus

|−⟩ = (|0⟩−|1⟩)/√2 state

ket_one

|1⟩ state

ket_plus

|+⟩ = (|0⟩+|1⟩)/√2 state

ket_zero

|0⟩ state

measure_computational

Measure a single qubit in the computational basis; returns (outcome, collapsed density matrix).

pure_state_density

Build the density matrix ρ = |ψ⟩⟨ψ| from a normalised 2-component state.