Figure 2
Quantum error detection against BFE.
The results are taken for three complementary bases, linear polarization 
, 
and circular polarization 
. (a), (b), (c) The performance in the case of 10 m SMF. (d), (e), (f) The performance in the case of 0.8 km SMF. The 2-fold coincidence curves in (d), (e), (f) have a small shift about 7 degree along the axis of HWP angle, which is due to a birefringence-induced polarization rotation in the long fiber that occurred after initializing the error of the whole channel. The gray parts are the error probabilities simulated by the NS. The red histograms show the error probabilities obtained with quantum error detection. The blue squares show the efficiencies of transmission. Error bars are given by Poissonian statistics.
