2.4k citations · 5k across the 56 of their papers we have counts for
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Entanglement detection
Otfried Gühne, Geza Toth
How can one prove that a given state is entangled? In this paper we review different methods that have been proposed for entanglement detection. We first explain the basic elements…
Experimental demonstration of a hyper-entangled ten-qubit Schrödinger cat state
Wei-Bo Gao, Chao-Yang Lu, Xing-Can Yao +7
Coherent manipulation of an increasing number of qubits for the generation of entangled states has been an important goal and benchmark in the emerging field of quantum information…
Generalized Ardehali-Bell inequalities for graph states
Otfried Gühne, Adan Cabello
We derive Bell inequalities for graph states by generalizing the approach proposed by Ardehali [Phys. Rev. A 46, 5375 (1992)] for Greenberger-Horne-Zeilinger (GHZ) states. Using th…
Iterations of nonlinear entanglement witnesses
Tobias Moroder, Otfried Gühne, Norbert Lütkenhaus
We describe a generic way to improve a given linear entanglement witness by a quadratic, nonlinear term. This method can be iterated, leading to a whole sequence of nonlinear witne…
Spin squeezing and entanglement
Geza Toth, Christian Knapp, Otfried Gühne +1
What is the relation between spin squeezing and entanglement? To clarify this, we derive the full set of generalized spin squeezing inequalities for the detection of entanglement.…
Unifying several separability conditions using the covariance matrix criterion
Oleg Gittsovich, Otfried Gühne, Philipp Hyllus +1
We present a framework for deciding whether a quantum state is separable or entangled using covariance matrices of locally measurable observables. This leads to the covariance matr…