Hi,
I have been reading Quantum Cryptography related papers for a short
while and I encountered some questions. Could any one of you clarify
them for me ?
1) Why the last bit of each block is discarded in reconciliation
process (parity check) of BB84 algorithm?
2) It is said that Eve can not eavesdrop without being detected because
she can use only rectilinear filter or diagonal filter. If she chooses
the wrong one this would change the polarization of photon and she can
be detected. I don't have any idea about filters but is not it possible
to make ONE filter that is both diagonal and rectilinear so that any
kind of photon polarization can be read without changing it ?
3) It is said that in privacy amplification step, n-m-s blocks are
chosen and their parity bits form the key for encryption. What does the
values of m and s depend on?
Thanks in advance.
