Entanglement detection via condition of quantum correlation

Details Entanglement detection via condition of quantum correlation Entanglement detection via condition of quantum correlation

2007-09-13

arxiv.org/abs/0709.1982v1

PHYSICAL REVIEW A 76, 032313 2007

Physics

Quantum Physics

Scientific paper

10.1103/PhysRevA.76.032313

We develop a novel necessary condition of quantum correlation. It is utilized to construct $d$-level bipartite Bell-type inequality which is strongly resistant to noise and requires only analyses of $O(d)$ measurement outcomes compared to the previous result $O(d^{2})$. Remarkably, a connection between the arbitrary high-dimensional bipartite Bell-type inequality and entanglement witnesses is found. Through the necessary condition of quantum correlation, we propose that the witness operators to detect truly multipartite entanglement for a generalized Greenberger-Horne-Zeilinger (GHZ) state with two local measurement settings and a four-qubit singlet state with three settings. Moreover, we also propose the first robust entanglement witness to detect four-level tripartite GHZ state with only two local measurement settings.

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