Villar A S, Martinelli M, Fabre C, Nussenzveig P
Instituto de Física, Universidade de São Paulo, Caixa Postal 66318, 05315-970 São Paulo, SP, Brazil.
Phys Rev Lett. 2006 Oct 6;97(14):140504. doi: 10.1103/PhysRevLett.97.140504.
We calculate the quantum correlations existing among the three output fields (pump, signal, and idler) of a triply resonant nondegenerate optical parametric oscillator operating above threshold. By applying the standard criteria [P. van Loock and A. Furusawa, Phys. Rev. A 67, 052315 (2003)], we show that strong tripartite continuous-variable entanglement is present in this well-known and simple system. Furthermore, since the entanglement is generated directly from a nonlinear process, the three entangled fields can have very different frequencies, opening the way for multicolored quantum information networks.
我们计算了阈值以上运行的三共振非简并光学参量振荡器的三个输出场（泵浦光、信号光和闲频光）之间存在的量子关联。通过应用标准判据[P. 范洛克和A. 古泽awa，《物理评论A》67，052315（2003年）]，我们表明在这个著名且简单的系统中存在强三方连续变量纠缠。此外，由于纠缠直接由非线性过程产生，这三个纠缠场可以具有非常不同的频率，为多色量子信息网络开辟了道路。
