Usami Koji, Nambu Yoshihiro, Shi Bao-Sen, Tomita Akihisa, Nakamura Kazuo
Department of Material Science and Engineering, Tokyo Institute of Technology, Yokohama 226-0026, Japan.
Phys Rev Lett. 2004 Mar 19;92(11):113601. doi: 10.1103/PhysRevLett.92.113601. Epub 2004 Mar 18.
We have measured antinormally ordered Hanbury Brown-Twiss correlations for coherent states of the electromagnetic field by using a stimulated parametric down-conversion process. Photons were detected by stimulated emission, rather than by absorption, so that the detection responded not only to actual photons but also to zero-point fluctuations via spontaneous emission. The observed correlations were distinct from normally ordered ones as they showed excess positive correlations, i.e., photon bunching effects, which arose from the thermal nature of zero-point fluctuations.
我们通过受激参量下转换过程测量了电磁场相干态的反常排序汉伯里·布朗 - 特威斯关联。光子是通过受激发射而非吸收来检测的，这样检测不仅对实际光子有响应，还通过自发发射对零点涨落有响应。所观测到的关联与正常排序的关联不同，因为它们表现出额外的正关联，即光子聚束效应，这是由零点涨落的热性质引起的。
