Hyperentangled states can outperform their classical counterparts on solving certain tasks. Here we present a simplified scheme for completely distinguishing two-photon hyperentangled Bell states in polarization, spatial, and time-bin degrees of freedom (DOFs). Unity fidelity can be achieved in principle without strong couple limitation between photon and quantum dot (QD), and the incomplete and imperfect QD-cavity interactions are prevented by single-photon detectors. In addition, auxiliary photons or DOFs are not required in our scheme. The necessary linear optical elements are fewer than the parity-check-based one.
@article{arxiv.2204.01442,
title = {Complete hyperentangled Bell states analysis for polarization-spatial-time-bin degrees of freedom with unity fidelity},
author = {Xin-Jie Zhou and Wen-Qiang Liu and Yan-Bei Zheng and Hai-Rui Wei and Fang-Fang Du},
journal= {arXiv preprint arXiv:2204.01442},
year = {2022}
}