Evaluation of two-photon polarization density matrix of polarization-entangled photon pairs generated through biexciton resonant hyper-parametric scattering
Yasuo Yamamoto, Goro Oohata, Kohji Mizoguchi · Journal of the Optical Society of America B · 2019
We have investigated the excitation-power dependence of polarization-entangled photon pairs generated from a CuCl single crystal using biexciton resonant hyper-parametric scattering. The two-photon polarization density matrix of photon pairs generated from a CuCl single crystal maintained at 10 K was measured under different excitation powers. The measured two-photon polarization density matrix, which corresponds to the two-photon polarization state, changes with an increase in the excitation power. The evaluations of the tangle and the linear entropy obtained from the measured density matrix indicate that the two-photon polarization density matrix can be expressed as the mixed state of an ideal state and a totally mixed state, and the mixture ratio of the totally mixed state increases as the excitation density increases. The variations of the density matrix and the mixture ratio with the excitation power originate from the generation of the multiple photon pairs. Furthermore, a numerical calculation considering simultaneous detection efficiency was able to reproduce the experimental results.