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.
For the K = 0branch and the K = 1branch the implemented equations are 0 =L ϱ00(A†) + (1−t)Lϱ00(A†z0) +tLϱ00+ϱ11(z0A†), 0 =L ϱ11(A†) + (1−t)Lϱ11(A†z1) +tLϱ00+ϱ11(z1A†)
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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.