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Figure 2: (a) Experimental setup of the AO-compensated, bi-directional, and OAM-encoded quantum communication link. (b) The OAM converter pairs used in the setup and the generated OAM intensity profiles [34]. AWG: arbitrary waveform generator; Attn.: attenuator; PBS: polarizing beam splitter; Col.: collimator; PC: polarization controller; HWP: half-wave plate; SLM: spatial light modulator; WFS: wavefront sensor; SPD: single photon detector; M.: mirror. The OAM intensity profiles are collected by using charge coupled device- (CCD-) based camera in the classical domain.