Abstract
An important problem in the practical application of high-dimensional two-photon orbital angular momentum (OAM) entanglement generated by spontaneous down conversion is a lower degree of entanglement, where the amplitudes of modes are not uniformly distributed. In contrast to the previously raised entanglement concentration protocol, we here report on an experimental scheme that addresses this problem by tuning the two-photon quantum angular position correlation. An opaque mask with N evenly distributed angular slits having a radius r is inserted in the two-photon down-conversion light path. The number N should be such that the separation of adjacent angular slits is larger than the scale of the two-photon angular position correlation. The OAM entanglement for the two-photon state after the opaque mask is cast into a set of folded subbands with a dimension of N, owing to the reduction of rotational symmetry from continuous invariance to discrete invariance. Almost maximum OAM entanglement can be realized by properly setting the width of the angular slits.
Highlights
Scitation.org/journal/apl eigenstate; this has a finite radial expansion, which reduces the spiral bandwidth.8 how to generate maximal entanglement given a specified dimension remains an important problem to be solved
An important problem in the practical application of high-dimensional two-photon orbital angular momentum (OAM) entanglement generated by spontaneous down conversion is a lower degree of entanglement, where the amplitudes of modes are not uniformly distributed
The OAM entanglement for the two-photon state after the opaque mask is cast into a set of folded subbands with a dimension of N, owing to the reduction of rotational symmetry from continuous invariance to discrete invariance
Summary
ARTICLES YOU MAY BE INTERESTED IN Quantum mechanics with patterns of light: Progress in high dimensional and multidimensional entanglement with structured light AVS Quantum Science 1, 011701 (2019); https://doi.org/10.1116/1.5112027 Entanglement distillation by Hong-Ou-Mandel interference with orbital angular momentum states APL Photonics 4, 016103 (2019); https://doi.org/10.1063/1.5079970 Light’s Orbital Angular Momentum Physics Today 57, 35 (2004); https://doi.org/10.1063/1.1768672
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