We experimentally demonstrate polarization entanglement for squeezed vacuum pulses containing more than 10^5 photons. We also study photon-number entanglement by calculating the Schmidt number and measuring its operational counterpart. Theoretically, our pulses are the more entangled the brighter they are. This promises important applications in quantum technologies, especially photonic quantum gates and quantum memories.
@article{arxiv.1111.2073,
title = {Polarization-Entangled Light Pulses of 10^5 Photons},
author = {Timur Sh. Iskhakov and Ivan N. Agafonov and Maria V. Chekhova and Gerd Leuchs},
journal= {arXiv preprint arXiv:1111.2073},
year = {2012}
}