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Continuous-variable QKD
Continuous-variable QKD encodes information in optical quadratures and relies on reconciliation under noise constraints.
Instead of single-photon states, Gaussian-modulated quadratures and coherent detection estimate channel noise and correlations.
The dedicated estimator reports SNR, covariance-style observables, and a Holevo-style teaching proxy rather than a full symplectic-eigenvalue security proof.