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Figure 6: (a) The QSER and (b) the registered photon rate in single-directional and bi-directional quantum links for one random turbulence realization. Different cases in (a-b): back-to-back link (1) with no probe beam and (2) with the probe beam; under the influence of turbulence effects (3) without compensation without the probe beam, (4) without compensation with the probe beam, and (5) with AO compensation with the probe beam. (c) QSERs under four different turbulence realizations. Different cases in (c) are as follows: (i) and (ii) are forward and backward channels without compensation without the probe beam; (iii) and (iv) are forward and backward channels without compensation with the probe beam; (v) and (vi) are forward and backward channels with AO compensation with the probe beam, respectively. The turbulence strength of is applied in (a-c). (d) The improvements of the AO mitigation in (a-c).