Pairs of photons entangled in the time frequency degree of freedom play a significant role in quantum communication due to their phase sensitive properties and high information capacity In this poster, we aim to demonstrate the swapping of high dimensional entanglement using time frequency photon pairs To achieve this, we have designed and simulated a nonlinear crystal capable of generating time frequency entanglement, and conducted initial experimental testing Furthermore, in order to accurately measure the properties of photon pairs in the time frequency domain, we have developed a high resolution time of flight ( spectrometer with a wavelength resolution of 0 05 nm Our experiment will provide a foundation for further investigations into the quantum characteristics of single photons in the time frequency degree of freedom, and contribute to the advancement of quantum information processing based on time frequency entanglement
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