Experimental demonstration of macroscopic quantum coherence in Gaussian states
Christoph Marquardt, Ulrik L. Andersen, Gerd Leuchs, Yuishi Takeno, Mitsuyoshi Yukawa, Hidehiro Yonezawa, and Akira Furusawa
Phys. Rev. A 76, 030101(R) (2007) - Published 18 September, 2007