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We experimentally demonstrate time-frequency entanglement of photon pairs produced in a cw-pumped quasi-phased-matched AlGaAs superlattice waveguide, producing 8×106 pairs/s with 96.0 ± 0.7% visibility without background subtraction, highest known visibility by far in AlGaAs waveguides.
Interference, one of the major physical phenomena, relies on coherent superposition of waves, undertaking different phase lag. Considering vectorial near-fields structure, the fundamental concept was reconsidered, reformulated, and demonstrated at optical and radio frequencies.
We verified interferometrically generation of spatially pure photon pairs via spontaneous parametric down-conversion in a multimode nonlinear waveguide in the 800 nm spectral region, obtaining two-photon interference visibility robustly exceeding 90% without any spatial filtering.
A novel ultra-short InP-based 1.31/1.55-µm wavelength demutiplexer, whose MMI section is only one beat length of the two guided modes, is demonstrated. The measured extinction ratios for 1.3/1.55-µm bands exceed 20/15 dB, respectively.
1.5µm degenerate-frequency photon pairs are generated in a silicon micro-ring cavity by reverse degenerate spontaneous four wave mixing. Their quantum interferences in Mach-Zehnder interferometers are demonstrated, showing their potential in quantum metrology and quantum information.
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