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We theoretically discuss one-photon and two-photon double-slit interferencesfor spontaneous and stimulated parametric down-conversions. We show that thetwo-photon sub-wavelength interference can exist in a general spontaneousparametric down-conversion (SPDC) for both type I and type II crystals. Wepropose an alternative way to observe sub-wavelength interference by ajoint-intensity measurement which occurs for only type I crystal in a highergain of SPDC. When a signal beam injects into the crystal, it may create twointerference patterns by two stimulated down-converted beams, showing nosub-wavelength interference effect.Comment: 10 pages, 6 figure

the european physical journal. d, atomic, molecular and optical physics/the european physical journal. d, atomic, molecular, optical and plasma physics

One-photon and two-photon double-slit interference in spontaneous and stimulated parametric down-conversions