@article{Chen2018, author = {Chen, Yuanyuan and Ecker, Sebastian and Wengerowsky, Sören and Bulla, Lukas and Joshi, Siddarth Koduru and Steinlechner, Fabian and Ursin, Rupert}, year = {2018}, pages = {200502}, title = {Polarization Entanglement by Time-Reversed Hong-Ou-Mandel Interference}, volume = {121}, journal = {Physical Review Letters} }