High-dimensional entanglement offers promising perspectives in quantum information science. In practice, however, the main challenge is to devise efficient methods to characterize high-dimensional entanglement, based on the available experimental data which is usually rather limited. Here we report the characterization and certification of high-dimensional entanglement in photon pairs, encoded in temporal modes. Building upon recently developed theoretical methods, we certify an entanglement of formation of 2.09(7) ebits in a time-bin implementation, and 4.1(1) ebits in an energy-time implementation. These results are based on very limited sets of local measurements, which illustrates the practical relevance of these methods.
@article{arxiv.1701.03269,
title = {Quantifying photonic high-dimensional entanglement},
author = {Anthony Martin and Thiago Guerreiro and Alexey Tiranov and Sébastien Designolle and Florian Fröwis and Nicolas Brunner and Marcus Huber and Nicolas Gisin},
journal= {arXiv preprint arXiv:1701.03269},
year = {2017}
}