Simulation of Leggett-Garg Inequalities Using a Heralded-single-photon Source

We have experimentally simulated the violation of the Leggett-Garg inequality (LGI) using a heralded-single-photon source via spontaneous parametric down-conversion (SPDC) in a periodically poled potassium titanyl phosphate (PPKTP) crystal. We measured the polarization fringe as a function of the angle of the linear polarization of the photons, and analyzed the LGI according to n measurement. Simulation results for LGI based on the polarization of the heralded single photon were in good agreement with theoretical calculations.

Automated summary

The experiment simulated the violation of the Leggett-Garg inequality using a heralded single-photon source generated by SPDC in a PPKTP crystal. The polarization fringe of the photons was measured and analyzed according to n measurements, with simulation results based on the polarization of the heralded single photon in good agreement with theoretical calculations.