Observation of photon antibunching with only one standard single-photon detector

The second-order photon correlation function g2(τ) is of great importance in quantum optics. typically measured with the Hanbury Brown and Twiss (HBT) interferometer, which employs a pair single-photon detectors dual-channel time acquisition module. Here, we demonstrate new method to measure extract standard avalanche photodiode (dead-time = 22 ns) single-channel This realized by shifting coincidence counts interest window not affected dead-time after-pulse detection system using fiber-based delay line. scheme verified measuring from single colloidal nanocrystal. Photon antibunching unambiguously observed agrees well result HBT setup. Our simplifies higher-order technique might be favored cost-sensitive circumstances.