Simple and Rigorous Proof Method for the Security of Practical Quantum Key Distribution in the Single-Qubit Regime Using Mismatched Basis Measurements. (arXiv:2208.13754v2 [quant-ph] UPDATED)

Quantum key distribution (QKD) protocols aim at allowing two parties to
generate a secret shared key. While many QKD protocols have been proven
unconditionally secure in theory, practical security analyses of experimental
QKD implementations typically do not take into account all possible loopholes,
and practical devices are still not fully characterized for obtaining tight and
realistic key rates. We present a simple method of computing secure key rates
for any practical implementation of discrete-variable QKD (which can also apply
to …

distribution key quantum quantum key distribution qubit security simple single