The influence of atmospheric turbulence on partially coherent two-photon entangled field

Samukelisiwe Purity Phehlukwayo, Marie Louise Umuhire, Yaseera Ismail +2 more

The development of a quantum network relies on the advances of hybrid systems which include ground-to-ground communication. However, the atmospheric turbulence of the environment poses a severe challenge to the optical quantum link. In this paper, we outline a theoretical and experimental investigation of the influence of atmospheric turbulence on the coincidence detection of the entangled photon pairs using a fully and partially spatially coherent pump beam. A spatial light modulator is encoded to mimic the atmospheric turbulence strength based on the Kolmogorov model of turbulence. The results show that the photon pairs generated using a partially spatially coherent pump are more robust towards varying atmospheric turbulence strengths than the photon pairs produced by a fully spatially coherent pump beam.

Jan Peřina

Mei-Song Wei, Jicheng Wang, Yixin Zhang +2 more

We investigate the decay properties of the quantum coherence and nonclassical correlations of two photonic qubits, which are partially entangled in their orbital angular momenta, through Kolmogorov turbulent atmosphere. It is found that the decay of quantum coherence and quantum discord may be qualitatively different from that of entanglement when the initial state of two photons is not maximally entangled. We derive two universal decay laws for quantum coherence and quantum discord, respectively, and show that the decay of quantum coherence is more robust than nonclassical correlations.

M. Schubert, W. Vogel

Mei-Song Wei, Jicheng Wang, Yixin Zhang +1 more

We investigate the decay properties of the quantumness including quantum entanglement, quantum discord, and quantum coherence for two photonic qubits, which are partially entangled in their orbital angular momenta, through Kolmogorov turbulent atmosphere. It is found that the decay of quantum coherence and quantum discord may be qualitatively different from that of quantum entanglement when the initial state of two photons is not maximally entangled. We also derive two universal decay laws for quantum coherence and quantum discord, respectively, and show that the decay of quantum coherence is more robust than nonclassical correlations.

Mamoon Safadi, Ohad Lib, Ho-Chun Lin +3 more