As far as I understand, CV-QKD (also here) uses coherent states to send a key, that is encoded in amplitude and phase quadratures. When someone tries to eavesdrop, this will introduce an error and therefore the eavesdropper is detected. I think I can see that an intercept/resend attack of any kind would introduce such an error. What I do not understand, however:

How is the error introduced if and eavesdropper just taps a few of the photons?



Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Browse other questions tagged or ask your own question.