Projects per year

### Abstract

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.

Original language | English |
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Article number | 012334 |

Number of pages | 6 |

Journal | Physical Review A |

Volume | 86 |

Issue number | 1 |

DOIs | |

Publication status | Published - 27 Jul 2012 |

### Keywords

- dimension
- high-dimensional
- two-photon
- orbital angular
- momentum entaglement

## Projects

- 3 Finished

## Challenges in Orbital Angular Momentum

Barnett, S.

EPSRC (Engineering and Physical Sciences Research Council)

1/01/11 → 30/11/14

Project: Research

## Full-field Coherent Quantum Imaging

Barnett, S.

EPSRC (Engineering and Physical Sciences Research Council)

1/04/08 → 31/05/12

Project: Research

## Cite this

*Physical Review A*,

*86*(1), [012334]. https://doi.org/10.1103/PhysRevA.86.012334