Abstract
We present a method for determining the presence of an eavesdropper in QKD systems without using any public bit comparison. Alice and Bob use a duplex QKD channel and the bit transport technique for relays. The only information made public is the respective basis choices which must be revealed in standard QKD systems anyway. We find that every filtered bit can be used to determine the presence of errors without compromising the security. This is an improvement on using a random sample in the standard BB84 protocol.
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