Function unitarity
Source pub fn unitarity(channel: &QuantumChannel) -> Result<f64, QuantumInfoError>
Expand description
Calculate the unitarity of a quantum channel.
u(E) = d/(d-1) * (F_pro(E⊗E, SWAP) - 1/d)
This measures how well the channel preserves purity.
§Arguments
channel - Quantum channel
§Returns
The unitarity u ∈ [0, 1]