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.
Since the value ofxs are sampled uniformly, the probability of the messageλis µλ= 1 4 ∑ x∈X p(λ|x).(A1) Equation (A1) is just the law of total probability with priorp(x) = 1/4
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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.