Abstract

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 $\left(\right|\mathrm{3,0}{⟩}_{\mathit{H,V}}-i\left|\mathrm{3,0}{⟩}_{\mathit{H,V}}\right)\sqrt{2}$, is a flip of mean polarization and can be well understood in terms of quantum Fisher information.

© 2010 Optical Society of America

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