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European Quantum Electronics Conference (EQEC)

Three photon W state

Manfred Eibl, Nikolai Kiesel, Mohamed Bourennane, Sascha Gaertner, Christian Kurtsiefer, Harald Weinfurter

Published Jan 1, 2003• 1 citation
Publisher

Abstract

Experimental preparation of the 3-photon W-state and demonstration some of its unique features, like how the pair-correlations depend on the observation of the third photon, and on the robustness of entanglement and violation of a 3-particle Mermin inequality are reported.
DOI
10.1109/eqec.2003.1314254

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There are different families of inequalities that can be used to characterize the entanglement of multiqubit entangled states by the violation of quantum mechanics prediction versus local realism prediction. In a noisy environment, the violation of different inequalities distinguishes a direct from a noise-free environment. That is, each inequality has a different robustness against noise. We investigate theoretically and experimentally this proposition with the Mermin inequality, Bell inequality, and Svetlichny inequality using three-qubit GHZ states for different levels of noise. Our purpose is to determine which one of the inequalities is more robust against noise and thus more suitable to characterize entanglement of states. Our results show that the Mermin inequality is the most robust against stronger noise and is, thus, more suitable for characterizing the entanglement of three-qubit GHZ states in a noisy environment.
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