Figure 4
From: Experimental realization of equiangular three-state quantum key distribution

Result obtained during 2 hour of continuous acquisition.
The time has been divided into 90 blocks of about 80 s each, with a mean number of 1.1 ⋅ 106 sifted bits. The QBER is estimated from inconclusive events, with Poissonian error bars. The secret key rate is estimated for the case of infinitely long key, using equation (2).