Experimental demonstration of two-color Einstein–Podolsky–Rosen entanglement in a hot vapor cell
Kai Wang, Shuai Shi, Wei Zhang, Ying-Hao Ye, Yichen Yu, Ming‐Xin Dong, Yueyang Zhai, Dong-Sheng Ding, Bao‐Sen Shi · OSA Continuum · 2019
Einstein–Podolsky–Rosen (EPR) entanglement, involving pairs of particles that are entangled in position and momenta, is of special importance for quantum information processing. Practical quantum communication requires a two-color entanglement source: visible-band photons used to excite atoms and the communication band used for signal transmission. In this article, we report on the first experimental demonstration of two-color EPR entanglement based on spontaneous Raman scattering thermal Rb atoms using quantum ghost interference and ghost imaging. This work adopts a fundamental experiment that assists in promoting practical quantum communications and in providing a means to perform quantum imaging.