Entanglement of polarization and orbital angular momentum
Abstract
We investigate two-photon entangled states using two important degrees of freedom of the electromagnetic field, namely orbital angular momentum (OAM) and spin angular momentum. For photons propagating in the same direction we apply the idea of entanglement duality and develop schemes to do entanglement sorting based on either OAM or polarization. In each case the entanglement is tested using appropriate witnesses. We finally present generalizations of these ideas to three- and four-photon entangled states.
- Publication:
-
Physical Review A
- Pub Date:
- June 2015
- DOI:
- 10.1103/PhysRevA.91.062303
- arXiv:
- arXiv:1502.01906
- Bibcode:
- 2015PhRvA..91f2303B
- Keywords:
-
- 03.67.Bg;
- 42.50.Dv;
- 42.50.Tx;
- 03.65.Ud;
- Entanglement production and manipulation;
- Nonclassical states of the electromagnetic field including entangled photon states;
- quantum state engineering and measurements;
- Optical angular momentum and its quantum aspects;
- Entanglement and quantum nonlocality;
- Quantum Physics
- E-Print:
- 6 pages, 3 figures