Abstract.
We theoretically discuss two-photon double-slit interference for spontaneous and stimulated parametric down-conversions and compare it with one-photon case. We show that two-photon sub-wavelength interference can exist in a general interaction of spontaneous parametric down-conversion (SPDC) for both type I and type II crystals. In low gain SPDC, interference effect can be attributed to the previous study based on two-photon entangled state. But the important fact is that the sub-wavelength interference will not be washed out even if in very high gain SPDC, revealing the macroscopic nature. We propose an alternative scheme to observe sub-wavelength interference with a joint-intensity measurement, which occurs for a type I crystal in the high gain case. The theoretical analysis shows that the effect originates from classical thermal correlation. However, we also formulate the one-photon and two-photon double-slit interference in the stimulated process, and show amplified interference patterns.
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Cao, DZ., Li, Z., Zhai, YH. et al. One-photon and two-photon double-slit interference in spontaneous and stimulated parametric down-conversions. Eur. Phys. J. D 33, 137–147 (2005). https://doi.org/10.1140/epjd/e2005-00030-0
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DOI: https://doi.org/10.1140/epjd/e2005-00030-0