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  1. A classical bit which is 0 with probability 50% and 1 with probability 50%.
  2. |1>x
  3. - The honest players Alice and Bob need to communicate quantumly.
  4. - QKD requires authenticated classical communication between Alice and Bob
  5. - If Eve does not successfully break the security during the protocol execution, the generated key will be secure forever.
  6. - The security of QKD is intuitively based on the no-cloning theorem of quantum mechanics.
  7. - The attackers can set up in straight lines between the verifiers and the claimed position and exchange all information with each other. In this way, they can carry out the same operations as the honest prover.
  8.  
  9. Bell measurements, entangled quantum states, classical communication
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