Calibration of the Franson Interferometer for Time-Frequency Quantum Entanglement Measurement

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In previous work, we demonstrated time-frequency entanglement distribution over 2.64 km within NCU's campus network. However, nonlinear phase control in the Franson interferometer distorted the estimated entanglement strength. In this work, we corrected the phase control, increasing nonlocal interference visibility from 83.4% to 87.3%, thereby restoring the true performance of the entanglement distribution system.

poster_Chen-Ling-Tsai.

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