Feng Sheng, Pfister Olivier
Department of Physics, University of Virginia, 382 McCormick Road, Charlottesville, Virginia 22904-4714, USA.
Phys Rev Lett. 2004 May 21;92(20):203601. doi: 10.1103/PhysRevLett.92.203601.
We report the first measurement of the quantum phase-difference noise of an ultrastable nondegenerate optical parametric oscillator that emits twin beams classically phase locked at exact frequency degeneracy. The measurement illustrates the property of a lossless balanced beam splitter to convert number-difference squeezing into phase-difference squeezing, and thus provides indirect evidence for Heisenberg-limited interferometry using twin beams. This experiment is a generalization of the Hong-Ou-Mandel interference effect for continuous variables and constitutes a milestone towards continuous-variable entanglement of bright, ultrastable nondegenerate beams.
我们报告了对一种超稳定非简并光学参量振荡器的量子相位差噪声的首次测量，该振荡器发射经典锁相于精确频率简并的孪生光束。该测量展示了无损平衡分束器将数差压缩转换为相位差压缩的特性，从而为使用孪生光束的海森堡极限干涉测量提供了间接证据。这个实验是连续变量的洪-欧-曼德尔干涉效应的推广，是朝着明亮、超稳定非简并光束的连续变量纠缠迈出的一个里程碑。
