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Protecting the entanglement of twisted photons by adaptive optics

: Leonhard, N.; Sorelli, G.; Shatokhin, V.N.; Reinlein, C.; Buchleitner, A.


Physical review. A 97 (2018), Nr.1, Art.012321
ISSN: 2469-9926
ISSN: 2469-9934
Fraunhofer IOF ()

We study the efficiency of adaptive optics (AO) correction for the free-space propagation of entangled photonic orbital-angular-momentum (OAM) qubit states to reverse moderate atmospheric turbulence distortions. We show that AO can significantly reduce crosstalk to modes within and outside the encoding subspace and thereby stabilize entanglement against turbulence. This method establishes a reliable quantum channel for OAM photons in turbulence, and it enhances the threshold turbulence strength for secure quantum communication by at least a factor 2.