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. 2022 Aug 5;8(31):eabn7876. doi: 10.1126/sciadv.abn7876

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Fig. 3. — (A) Schematic of the experimental setup for measuring position and angle coincidences. Inset shows the EMCCD images of the SPDC field and the corresponding two-photon position and angle probability distribution functions. (B) Schematic of the experimental setup for measuring the two-photon momentum probability distribution function. Inset shows EMCCD images of the SPDC field and the corresponding two-photon momentum probability distribution function. (C) Schematic of the experimental setup for measuring OAM coincidence and the OAM correlation. LPF, long-pass filter; BS, beam splitter; SLM, spatial light modulator; SMF, single-mode fiber; F, interference filter. The BH is used for generating turbulence, and it is switched on in the path of the SPDC field when studying the effect of turbulence on entanglement propagation.