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Scalable multiparticle entanglement of trapped ions
The scalable and deterministic generation of four-, five-, six-, seven- and eight-particle entangled states of the W type with trapped ions are reported, which obtain the maximum possible information on these states by performing full characterization via state tomography, using individual control and detection of the ions.
Experimental detection of multipartite entanglement using witness operators.
A canonical way of constructing and decomposing witness operators so that they can be directly implemented with present technology is introduced and applied to three- and four-qubit entangled states of polarized photons, giving experimental evidence that the considered states contain true multipartite entanglement.
Separability criteria for genuine multiparticle entanglement
We present a method to derive separability criteria for different classes of multiparticle entanglement, especially genuine multiparticle entanglement. The resulting criteria are necessary and…
Optimal spin squeezing inequalities detect bound entanglement in spin models.
The complete set of generalized spin squeezing inequalities are determined, which can be used for the experimental detection of entanglement in a system of spin-1/2 particles in which the spins cannot be individually addressed.
Taming multiparticle entanglement.
A criterion for entanglement which can easily be calculated by using semidefinite programing and improves all existing approaches significantly is presented, leading to an exponential improvement compared with existing schemes.
State-independent experimental test of quantum contextuality
The question of whether quantum phenomena can be explained by classical models with hidden variables is the subject of a long-lasting debate. In 1964, Bell showed that certain types of classical…
Detecting genuine multipartite entanglement with two local measurements.
These witnesses are robust against noise and require only two local measurement settings when used in an experiment, independent of the number of qubits, which allows detection of entanglement for an increasing number of parties without a corresponding increase in effort.
Quantum correlations between two parties are essential for the argument of Einstein, Podolsky, and Rosen in favour of the incompleteness of quantum mechanics. Schr\"odinger noted that an essential…
Memory cost of quantum contextuality
The simulation of quantum effects requires certain classical resources, and quantifying them is an important step to characterize the difference between quantum and classical physics. For a…
Joint measurability of generalized measurements implies classicality.
It is proved that a set of generalized measurements which does not satisfy the notion of joint measurability is nonclassical, as it can be used for the task of quantum steering and the equivalence allows one to derive novel steering inequalities from known results on joint measuability.