Correlated twirling via unitary 2-design converts deterministic asymmetric polarization rotations into an isotropic Pauli depolarizing channel, suppressing noise by 2/3 and extending misalignment tolerance in MDI-QKD simulations.
Braunstein and Stefano Pirandola
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Hardware-Free Polarization Stabilization for Measurement-Device-Independent Quantum Key Distribution via Correlated Twirling
Correlated twirling via unitary 2-design converts deterministic asymmetric polarization rotations into an isotropic Pauli depolarizing channel, suppressing noise by 2/3 and extending misalignment tolerance in MDI-QKD simulations.