Tobias Moroder
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View article: Proving genuine multiparticle entanglement from separable nearest-neighbor marginals
Proving genuine multiparticle entanglement from separable nearest-neighbor marginals Open
We address the question of whether or not global entanglement of a quantum state can be inferred from local properties. Specifically, we are interested in genuinely multiparticle entangled states whose two-body marginals are all separable,…
View article: Adaptive strategy for joint measurements
Adaptive strategy for joint measurements Open
We develop a technique to find simultaneous measurements for noisy quantum\nobservables in finite-dimensional Hilbert spaces. We use the method to derive\nlower bounds for the noise needed to make incompatible measurements jointly\nmeasura…
View article: Steering Maps and Their Application to Dimension-Bounded Steering
Steering Maps and Their Application to Dimension-Bounded Steering Open
The existence of quantum correlations that allow one party to steer the quantum state of another party is a counterintuitive quantum effect that was described at the beginning of the past century. Steering occurs if entanglement can be pro…
View article: Multiparticle entanglement as an emergent phenomenon
Multiparticle entanglement as an emergent phenomenon Open
The question whether global entanglement of a multiparticle quantum system\ncan be inferred from local properties is of great relevance for the theory of\nquantum correlations as well as for experimental implementations. We present a\nmeth…
View article: Evaluating Convex Roof Entanglement Measures
Evaluating Convex Roof Entanglement Measures Open
We show a powerful method to compute entanglement measures based on convex roof constructions. In particular, our method is applicable to measures that, for pure states, can be written as low order polynomials of operator expectation value…
View article: Systematic Errors in Current Quantum State Tomography Tools
Systematic Errors in Current Quantum State Tomography Tools Open
Common tools for obtaining physical density matrices in experimental quantum state tomography are shown here to cause systematic errors. For example, using maximum likelihood or least squares optimization to obtain physical estimates for t…
View article: Nonclassicality tests and entanglement witnesses for macroscopic mechanical superposition states
Nonclassicality tests and entanglement witnesses for macroscopic mechanical superposition states Open
We describe a set of measurement protocols for performing non-classicality\ntests and the verification of entangled superposition states of macroscopic\ncontinuous variable systems, such as nanomechanical resonators. Following\nearlier wor…