Scalable continuous-variable entanglement of light beams produced by optical parametric oscillators
Abstract
We show that scalable multipartite entanglement among light fields may be generated by optical parametric oscillators (OPOs). The tripartite entanglement existent among the three bright beams produced by a single OPO—pump, signal, and idler—is scalable to a system of many OPOs by pumping them in cascade with the same optical field. This latter serves as an entanglement distributor. The special case of two OPOs is studied, as it is shown that the resulting five bright beams share genuine multipartite entanglement. In addition, the structure of entanglement distribution among the fields can be manipulated to some degree by tuning the incident pump power. The scalability to many fields is straightforward, allowing an alternative implementation of a multipartite quantum information network with continuous variables.
- Publication:
-
Physical Review A
- Pub Date:
- February 2008
- DOI:
- 10.1103/PhysRevA.77.022311
- arXiv:
- arXiv:0801.2706
- Bibcode:
- 2008PhRvA..77b2311C
- Keywords:
-
- 03.67.Mn;
- 42.50.Dv;
- 42.65.Yj;
- Entanglement production characterization and manipulation;
- Nonclassical states of the electromagnetic field including entangled photon states;
- quantum state engineering and measurements;
- Optical parametric oscillators and amplifiers;
- Quantum Physics
- E-Print:
- Phys. Rev. A 77, 022311 (2008)