Polarization squeezing and multipartite entanglement of triphoton states
Guangri Jin, Shunlong Luo, Yong‐Chun Liu, Hui Jing, W. M. Liu · Journal of the Optical Society of America B · 2010
Based upon standard angular momentum theory, we develop a framework to investigate polarization squeezing and multipartite entanglement of a quantum light field. Both mean polarization and variances of the Stokes parameters are obtained analytically, with which we study recent observation of triphoton states [L. K. Shalm et al., Nature 457, 67 (2009)]. Our results show that the appearance of the maximally entangled NOON state accompanied by (|3,0⟩H,V−i|3,0⟩H,V)√2, is a flip of mean polarization and can be well understood in terms of quantum Fisher information.