3 votes

Doubt in understanding the use of Uhlmann's Theorem in BB84 security proof

The relation in 1. is essentially a statement of Uhlmann's theorem. Ulmann's theorem states: Given two density matrices $\rho$ and $\sigma$, we have that the fidelity $F(\rho, \sigma)$ is given by $$F(...
xzkxyz's user avatar
  • 406
1 vote

Choosing E91/BB84 basis states and angles

The fundamental idea of $S\leq 2$ remains the same. However, when you design the scheme, you ideally want two things: When you're measuring the generate key, the two parties should be using the same ...
DaftWullie's user avatar
  • 57.9k
1 vote

What authentication protocol to use for BB84 and other QKD protocols?

In classical cryptography, the Diffie-Hellman key exchange is also susceptible to a man-in-the-middle attack, and to get around that, we use a digital signature algorithm, like RSA or ECDSA. You can ...
amihart's user avatar
  • 41

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