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Quantum technologies hold great promise for revolutionizing photonicapplications such as cryptography. Yet their implementation in real-worldscenarios is held back, mostly due to sensitivity of quantum light toscattering. Recent developments in optimizing the shape of single photonsintroduce new ways to control quantum light. Nevertheless, shaping singlephotons in real-time remains a challenge due to the weak associated signals,which are too noisy for optimization processes. Here, we overcome thischallenge and control scattering of entangled photons by shaping the classicallaser beam that stimulates their creation. We discover that since the classicalbeam and the entangled photons follow the same path, the strong classicalsignal can be used for optimizing the weak quantum signal. We show that thisapproach can increase the length of free-space turbulent quantum links by up totwo orders of magnitude, opening the door for employing wavefront shaping forquantum communications.

Real-time shaping of entangled photons by classical control and feedback