4 ms·

For eavesdropping, there is someone there who cares about what you're sending and is successfully learning things about it.

• thesz 1y ago
  How can one quantumly differentiate between photon lost due to eavesdropping and photon lost due to some other error?
  • staunton 1y ago
    Other than by going around and finding the eavesdropper sitting somewhere, one cannot.