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In a QKD protocol such as BB84 how do Alice and Bob deal with lost or undetected photons?

To address this, the BB84 protocol involves several steps to maintain security and establish a shared key even when some photons are lost: Shared Basis Announcement: After sending the qubits, Bob ...
Shravan Patel's user avatar
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In a QKD protocol such as BB84 how do Alice and Bob deal with lost or undetected photons?

If the photons are sent sequentially, they can implement some synchronous control and detect the missed bits by timing. Also, they could implement additional control using public non-encrypted ...
dariox's user avatar
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