Fig. 2: Private communication with chaos synchronization.

2D and 1D (insets) correlation diagrams for the filtered intensity of the slave and the master QCL (left panels). Bit series (right panels) for the initial message (IM in green), the difference (in purple), the master’s signal (in red) and the slave’s signal (in blue). Except for the initial message, the number of errors is written on the right side of the bit series, with the corresponding color. a, b correspond to the global sequence with 791 bits, c, d correspond to a portion of the global sequence, between 1 and 191, e, f correspond to a portion of the global sequence, between 400 and 591, g, h correspond to a cross-analysis between the slave signal of the second row and the master signal of the third row.