Protecting entanglement of twisted photons by adaptive optics
arXiv:1709.09887 · doi:10.1103/PhysRevA.97.012321
Abstract
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 enhances the threshold turbulence strength for secure quantum communication at least by a factor two.
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- Structured Light in Turbulence
- Optimal vector beams maintaining robust intensity profile on propagation through turbulence
- Satellite-to-Earth Quantum Key Distribution via Orbital Angular Momentum
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- Information processing at the speed of light
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