Operational bounds on state exclusion (not only identification) plus a three-setting retained-key protocol certify positive SDI-QKD rates down to nearly vanishing preparation visibility.
At an active quadrature node0 < t <1, the BFF variational objective becomes βt = inf Z0,Z1 1 2 1∑ k=0 { Tr [ ηk(Zk +Z† k) ] + (1−t) Tr ( ηkZ† kZk ) +tTr ( ΩZkZ† k )}
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Semi-Device-Independent Quantum Key Distribution from Operational Assumptions
Operational bounds on state exclusion (not only identification) plus a three-setting retained-key protocol certify positive SDI-QKD rates down to nearly vanishing preparation visibility.