Under a symmetry condition, an SDI security witness equals twice the sum of visibility and distinguishability, and a tightened bound lowers the certification threshold to D+V > 1.332.
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Certifying semi-device-independent security via wave-particle duality experiments
Under a symmetry condition, an SDI security witness equals twice the sum of visibility and distinguishability, and a tightened bound lowers the certification threshold to D+V > 1.332.