New scheme for generating GHZ like state of $n$ photons

Abstract

In this paper we propose a new scheme for creating a three photons GHZ state using only linear optics elements and single photon detectors. We furthermore generalize the scheme for producing any GHZ-like state of $n$ photons. The input state of the scheme consists of a non-entangled state of $n$ photons. Experimental aspects regarding the implementation of the scheme are presented. Finally, the role of such schemes in quantum information processing with photons is discussed.

4 pages, 4 figures

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• Linear-optical implementations of the iSWAP and controlled NOT gates based on conventional detectors
• Generating Greenberger-Horne-Zeilinger states using multiport splitters
• Push button generation of multiphoton entanglement
• Heralding Higher-Dimensional Bell and Greenberger-Horne-Zeilinger States Using Multiport Splitters