In a silicon nitride microresonator, the linewidth of photon pairs generated by four-wave mixing narrows continuously from the cavity-limited scale (about 85 MHz) toward the pump scale (193 kHz) near the OPO threshold, and a linearized Lindblad model reproduces the trend.
Bell violation using entangled photons without the fair-sampling assumption,
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Spectral evolution of two-photon emission in microresonators
In a silicon nitride microresonator, the linewidth of photon pairs generated by four-wave mixing narrows continuously from the cavity-limited scale (about 85 MHz) toward the pump scale (193 kHz) near the OPO threshold, and a linearized Lindblad model reproduces the trend.