Experimental twin-field quantum key distribution with flawed and correlated sources. (arXiv:2204.08323v2 [quant-ph] UPDATED)

The security of quantum key distribution (QKD) is severely threatened by
discrepancies between realistic devices and theoretical assumptions. Recently,
a significant framework called the reference technique was proposed to provide
security against arbitrary source flaws, including pulse correlations. Here, we
propose an efficient four-phase twin-field QKD using laser pulses adopting the
reference technique for security against potential source imperfections. We
present a characterization of source flaws and connect them to experiments,
together with a finite-key analysis against coherent attacks. In …

distribution key quantum quantum key distribution