Increasing two-photon entangled dimensions by shaping input beam profiles
Abstract
Photon pair entangled in high dimensional orbital angular momentum (OAM) degree of freedom (DOF) has been widely regarded as a possible source in improving the capacity of quantum information processing. The need for the generation of a high dimensional maximally entangled state in the OAM DOF is therefore much desired. In this work, we demonstrate a simple method to generate a broader and flatter OAM spectrum, i.e. a larger spiral bandwidth (SB), of entangled photon pairs generated through spontaneous parametric down-conversion by modifying the pump beam profile. By investigating both experimentally and theoretically, we have found that an exponential pump profile that is roughly the inverse of the mode profiles of the single-mode fibers used for OAM detection will provide a much larger SB when compared to a Gaussian shaped pump.
Cite
@article{arxiv.2001.04717,
title = {Increasing two-photon entangled dimensions by shaping input beam profiles},
author = {Shilong Liu and Yingwen Zhang and Chen Yang and Shikai Liu and Zheng Ge and Yinhai Li and Yan Li and Zhiyuan Zhou and Guangcan Guo and Baosen Shi},
journal= {arXiv preprint arXiv:2001.04717},
year = {2020}
}
Comments
This manuscript was accepted by PRA. In this version, we compose sup. to the main text, also fine repair some figures