The paper derives a sufficient condition for a positive Woodhead key-rate bound in BB84-like QKD, but the key inequality is false and the attack's induced error rate is never computed.
Simplifying this condition, we get a quadratic equation in δz, which is given by δ2 z − 2
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Condition for the generation of the secret key in a BB84 like quantum key distribution protocol
The paper derives a sufficient condition for a positive Woodhead key-rate bound in BB84-like QKD, but the key inequality is false and the attack's induced error rate is never computed.