Abstract
The second-order correlation function of light constitutes a pivotal tool to quantify the quantum behavior of an emitter and in turn its potential for quantum information applications. The experimentally accessible time resolution of is usually limited by the jitter of available single-photon detectors. Here, we present a versatile technique allowing to be measured from a large variety of light signals with a time resolution given by the pulse length of a mode-locked laser. The technique is based on frequency upconversion in a nonlinear waveguide, and we analyze its properties and limitations by modeling the pulse propagation and the frequency conversion process. We measure from various signals including light from a quantum emitter—a confined exciton-polariton structure—revealing its quantum signatures at a scale of a few picoseconds and demonstrating the capability of the technique.
© 2019 Optical Society of America
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