Two-photon spatial correlations are affected only by the even-parity component of far-field phase distortion, so odd-parity disorder can be ignored in wavefront correction.
Pump-shaping of non-collinear and non-degenerate entangled photons
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abstract
Free-space quantum key distribution is gaining increasing interest as a leading platform for long range quantum communication. However, the sensitivity of quantum correlations to scattering induced by turbulent atmospheric links limits the performance of such systems. Recently, methods for compensating the scattering of entangled photons have been demonstrated, allowing for real-time optimization of their quantum correlations. In this Letter, we demonstrate the use of wavefront shaping for compensating the scattering of non-collinear and non-degenerate entangled photons. These results demonstrate the applicability of wavefront shaping schemes for protocols utilizing the large bandwidth and emission angle of the entangled photons.
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Partial-immunity of two-photon correlation against wavefront distortion for spatially entangled photons
Two-photon spatial correlations are affected only by the even-parity component of far-field phase distortion, so odd-parity disorder can be ignored in wavefront correction.