Any practical experiment utilizing the innate $D$ -dimensional entanglement of the orbital angular momentum (OAM) of photons is subject to the generation capacity of the entangled photon source and the modal capacity of the detection system. We report an experimental spontaneous parametric-down-conversion system able to generate and detect tunable high-dimensional OAM entanglement. By tuning the phase matching, we demonstrate a factor of 2 increase on the half-width of the OAM-correlation spectrum, from 10 to 20. In terms of quantum mutual information capacity, this is an increase from $3.18$ to $4.95$ bits/photon. Furthermore, we measure correlations in the conjugate variable, angular position, and obtain concurrence values $0.96$ and $0.90$ . The good entanglement measures in both OAM and angular position bases indicate bipartite, $D$ -dimensional entanglement where $D$ is tunable.Any practical experiment utilizing the innate $D$-dimensional entanglement of the orbital angular momentum (OAM) of photons is subject to the generation capacity of the entangled photon source and the modal capacity of the detection system. We report an experimental spontaneous parametric-down-conversion system able to generate and detect tunable high-dimensional OAM entanglement. By tuning the phase matching, we demonstrate a factor of 2 increase on the half-width of the OAM-correlation spectrum, from 10 to 20. In terms of quantum mutual information capacity, this is an increase from $3.18$ to $4.95$ bits/photon. Furthermore, we measure correlations in the conjugate variable, angular position, and obtain concurrence values $0.96$ and $0.90$. The good entanglement measures in both OAM and angular position bases indicate bipartite, $D$-dimensional entanglement where $D$ is tunable.

arXiv:1205.1968Physical Review AJul 27, 2012107 citations

Towards entanglement of very high orbital angular momentum

Robert Fickler, Radek Łapkiewicz, Christoph Schaeff +4 more

Bulletin of the American Physical SocietyMar 21, 20110 citations

Entanglement of angular momentum

Institute of Physics eBooksNov 26, 20040 citations

Phase correlation arc and universal decay of entangled orbital angular momentum qubit states in atmospheric turbulence

Donghui Yang, Zheng-Da Hu, Shuailing Wang +1 more

In this study, we introduce the phase correlation arc of an orbital angular momentum (OAM) beam to investigate the evolution of OAM entanglement. We reveal that the entanglement decay of all OAM states of Laguerre-Gaussian modes in atmospheric turbulence is universal via both numerical predictions and experimental data. A similar evolution law is also theoretically confirmed to exist in Bessel-Gaussian modes. Finally, by using the phase correlation arc, the precise formula of the decay distance dependence on the OAM number is derived, and it exhibits excellent agreement with previous experimental conclusions.In this study, we introduce the phase correlation arc of an orbital angular momentum (OAM) beam to investigate the evolution of OAM entanglement. We reveal that the entanglement decay of all OAM states of Laguerre-Gaussian modes in atmospheric turbulence is universal via both numerical predictions and experimental data. A similar evolution law is also theoretically confirmed to exist in Bessel-Gaussian modes. Finally, by using the phase correlation arc, the precise formula of the decay distance dependence on the OAM number is derived, and it exhibits excellent agreement with previous experimental conclusions.

Optics LettersOct 14, 20216 citations

Entangled States of Orbital Angular Momentum of Photons

Alois Mair, Anton Zeilinger

Springer eBooksJan 1, 19992 citations

Orbital Angular Momentum Correlations in Spontaneous Parametric Down Conversion

Clara I. Osorio, Gabriel Molina‐Terriza, Juan P. Torres

We show that the orbital angular momentum (OAM) correlations, and the amount of spatial entanglement, of paired photons generated in spontaneous parametric downconver- sion are strongly affected by the use of noncollinear configurations and by the presence of Poynting vector walk-off. We discuss how our results are related to the question of the conservation of OAM in a nonlinear optics process, and we derive selection rules that allow to determine the sought-after OAM correlations, especially for those configurations used in current quantum information experiments.We show that the orbital angular momentum (OAM) correlations, and the amount of spatial entanglement, of paired photons generated in spontaneous parametric downconver- sion are strongly affected by the use of noncollinear configurations and by the presence of Poynting vector walk-off. We discuss how our results are related to the question of the conservation of OAM in a nonlinear optics process, and we derive selection rules that allow to determine the sought-after OAM correlations, especially for those configurations used in current quantum information experiments.

The Rochester Conferences on Coherence and Quantum Optics and the Quantum Information and Measurement meetingJan 1, 20070 citations

Any practical experiment utilizing the innate

D

-dimensional entanglement of the orbital angular momentum (OAM) of photons is subject to the generation capacity of the entangled photon source and the modal capacity of the detection system. We report an experimental spontaneous parametric-down-conversion system able to generate and detect tunable high-dimensional OAM entanglement. By tuning the phase matching, we demonstrate a factor of 2 increase on the half-width of the OAM-correlation spectrum, from 10 to 20. In terms of quantum mutual information capacity, this is an increase from

3.18

4.95

bits/photon. Furthermore, we measure correlations in the conjugate variable, angular position, and obtain concurrence values

0.96

and

0.90

. The good entanglement measures in both OAM and angular position bases indicate bipartite,

D

-dimensional entanglement where

D

is tunable.