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Quantum key distribution (BB84)
How to detect an eavesdropper
MCQ
In BB84, how do Alice and Bob detect the presence of an eavesdropper on the quantum channel?
Possible answers
By checking that their announced bases remained secret
By breaking the eavesdropper's RSA key
By estimating the error rate (QBER) on a sample of the key: too many errors give the eavesdropper away
By measuring the photons' transmission time
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