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The ability of an eavesdropper (Eve) to perform an intercept-resend attack ona free-space quantum key distribution (QKD) receiver by precisely controllingthe incidence angle of an attack laser has been previously demonstrated.However, such an attack could be ineffective in the presence of atmosphericturbulence due to beam wander and spatial mode aberrations induced by the air'svarying index of refraction. We experimentally investigate the impactturbulence has on Eve's attack on a free-space polarization-encoding QKDreceiver by emulating atmospheric turbulence with a spatial light modulator.Our results identify how well Eve would need to compensate for turbulence toperform a successful attack by either reducing her distance to the receiver, orusing beam wavefront correction via adaptive optics. Furthermore, we use anentanglement-breaking scheme to find a theoretical limit on the turbulencestrength that hinders Eve's attack.

Eavesdropper's ability to attack a free-space quantum-key-distribution receiver in atmospheric turbulence