期刊
FRONTIERS IN PHYSICS
卷 10, 期 -, 页码 -出版社
FRONTIERS MEDIA SA
DOI: 10.3389/fphy.2022.971360
关键词
orbital angular momentum; quantum entanglement; high-dimensional entanglement; nonlinear film; phase matching
资金
- National Key R&D Program of China
- National Natural Science Foundation of China
- Collaborative Innovation Center of Extreme Optics
- [2019YFA0705000]
- [2019YFA0308700]
- [2020YFA0309500]
- [12074197]
- [12074196]
- [11922406]
The article investigates the use of spontaneous parametric down conversion (SPDC) technology based on an ultrathin nonlinear lithium niobite crystal to demonstrate relatively flat high-dimensional OAM entanglement. The differences in coincidences between different-order OAM modes significantly decrease, providing a microscale SPDC source for further enhancing the nonlinear process and generating optimal high-dimensional OAM entanglement.
Entanglement, as a crucial feature of quantum systems, is essential for various applications of quantum technologies. High-dimensional entanglement has the potential to encode arbitrary large amount of information and enhance robustness against eavesdropping and quantum cloning. The orbital angular momentum (OAM) entanglement can achieve the high-dimensional entanglement nearly for free stems due to its discrete and theoretically infinite-dimensional Hilbert space. A stringent limitation, however, is that the phase-matching condition limits the entanglement dimension because the coincidence rate decreases significantly for high-order modes. Here we demonstrate relatively flat high-dimensional OAM entanglement based on a spontaneous parametric down conversion (SPDC) from an ultrathin nonlinear lithium niobite crystal. The difference of coincidences between the different-order OAM modes significantly decreases. To further enhance the nonlinear process, this microscale SPDC source will provide a promising and integrated method to generate optimal high-dimensional OAM entanglement.
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