Preparation and purification of four-photon Greenberger–Horne–Zeilinger state. (30th January 2015)

• Record Type: Journal Article
• Authors: He, Ying-Qiu; Ding, Dong; Yan, Feng-Li; Gao, Ting
• Is Part Of: Journal of physics. Volume 48:Number 5(2015:Mar. 01)
• Publication Date: 2015-01-30
• Subjects: preparation and purification -- four-photon Greenberger–Horne–Zeilinger state -- cross-Kerr nonlinearity; Atoms -- Periodicals; Molecules -- Periodicals; Optics -- Periodicals; Nuclear physics -- Periodicals; 539.6
• DOI: 10.1088/0953-4075/48/5/055501
• Languages: English
• ISSNs: 0953-4075

Abstract

Abstract: We present an efficient scheme for the preparing and purifying of the four-photon Greenberger–Horne–Zeilinger (GHZ) state based on linear optics and postselection. First, we describe how to create a four-photon GHZ state in both polarization and spatial degrees of freedom from two pairs. Moreover, in the presence of depolarization noise our scheme is capable of purifying the desired state. In the regime of weak nonlinearity we design an indirect photon number-resolving detection to distinguish two states of the two pairs. At last, a fourfold coincidence detector click indicates the creation of a polarization-entangled four-photon GHZ state.