期刊
JOURNAL OF OPTICS
卷 23, 期 10, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/2040-8986/ac213c
关键词
Laguerre-Gaussian; high-dimensional entanglement; entanglement certification
类别
资金
- UK Engineering and Physical Sciences Research Council (EPSRC) [EP/P024114/1]
- QuantERA ERA-NET Co-fund (FWF) [I3773-N36]
- EPSRC [EP/P024114/1] Funding Source: UKRI
This passage discusses the spatial structure of photons and its applications in quantum physics. Through experiments, it confirms entanglement between photon pairs and studies quantum correlations between different LG mode groups. The text also proposes precise measurement methods for high-dimensional entanglement certification.
It is well known that photons can carry a spatial structure akin to a 'twisted' or 'rippled' wavefront. Such structured light fields have sparked significant interest in both classical and quantum physics, with applications ranging from dense communications to light-matter interaction. Harnessing the full advantage of transverse spatial photonic encoding using the Laguerre-Gaussian (LG) basis in the quantum domain requires control over both the azimuthal (twisted) and radial (rippled) components of photons. However, precise measurement of the radial photonic degree-of-freedom has proven to be experimentally challenging primarily due to its transverse amplitude structure. Here we demonstrate the generation and certification of full-field LG entanglement between photons pairs generated by spontaneous parametric down conversion in the telecom regime. By precisely tuning the optical system parameters for state generation and collection, and adopting recently developed techniques for precise spatial mode measurement, we are able to certify fidelities up to 85% and entanglement dimensionalities up to 26 in a 43-dimensional radial and azimuthal LG mode space. Furthermore, we study two-photon quantum correlations between nine LG mode groups, demonstrating a correlation structure related to mode group order and inter-modal cross-talk. In addition, we show how the noise-robustness of high-dimensional entanglement certification can be significantly increased by using measurements in multiple LG mutually unbiased bases. Our work demonstrates the potential offered by the full spatial structure of the two-photon field for enhancing technologies for quantum information processing and communication.
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