Time-of-Flight Spectrometer (ToFS) is a crucial tool for measuring time- frequency (TF) entanglement through time-frequency mapping using dispersive media, essential for TF quantum information applications. In this work, we developed and calibrated the ToFS, allowing us to clearly observe the frequency correlations of photon pairs generated from spontaneous parametric down-conversion (SPDC). This work lays a solid foundation for our research team in measuring frequency entanglement and further advancing TF quantum information processing techniques.
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