Two-color hyper-entangled photon pairs generation in a cold ^85Rb atomic ensemble
Ming‐Xin Dong, Wei Zhang, Shuai Shi, Kai Wang, Zhi‐Yuan Zhou, Shi-Long Liu, Dong-Sheng Ding, Bao‐Sen Shi · Optics Express · 2017
Rb atomic ensemble. The photons in each pair generated are entangled in both the time-frequency and polarization degrees of freedom. Such hyper-entangled photon pairs with special wavelength have potential applications in high-dimensional quantum communication and quantum physics.