Coding of information using of pseudo-random sequences  in quantum communication systems providing an operation with a low probability of single-photons detection is proposed. The results of statistical modeling of information extraction from the bit stream, received at different specified probability of detection based on the correlation properties of the M-sequences are demonstrated. It's demonstrated that the peak value of cross-correlation function for the M-sequence of 255 bits is on the average more than 2 times higher  than the level of side lobes at the probability of single-photons detection 20%.

Keywords: quantum communications, single-photon detector, maximum length sequence