Results 11 to 20 of about 46 (45)
Quantum steering ellipsoids, extremal physical states and monogamy
New Journal of Physics, 2014 Any two-qubit state can be faithfully represented by a steering ellipsoid inside the Bloch sphere, but not every ellipsoid inside the Bloch sphere corresponds to a two-qubit state.
Antony Milne +4 more
doaj +1 more source
New Journal of Physics, 2017 When a measurement is compatible with each of two other measurements that are incompatible with one another, these define distinct contexts for the given measurement. The Kochen–Specker theorem rules out models of quantum theory that satisfy a particular
Anirudh Krishna +2 more
doaj +1 more source
Entanglement and extreme spin squeezing of unpolarized states
New Journal of Physics, 2017 We present criteria to detect the depth of entanglement in macroscopic ensembles of spin- j particles using the variance and second moments of the collective spin components.
Giuseppe Vitagliano +5 more
doaj +1 more source
Entanglement rate for Gaussian continuous variable beams
New Journal of Physics, 2016 We derive a general expression that quantifies the total entanglement production rate in continuous variable systems, where a source emits two entangled Gaussian beams with arbitrary correlators.
Zhi Jiao Deng +2 more
doaj +1 more source
Building versatile bipartite probes for quantum metrology
New Journal of Physics, 2016 We consider bipartite systems as versatile probes for the estimation of transformations acting locally on one of the subsystems. We investigate what resources are required for the probes to offer a guaranteed level of metrological performance, when the ...
Alessandro Farace +3 more
doaj +1 more source
Thermodynamic cost of creating correlations
New Journal of Physics, 2015 We investigate the fundamental limitations imposed by thermodynamics for creating correlations. Considering a collection of initially uncorrelated thermal quantum systems, we ask how much classical and quantum correlations can be obtained via a cyclic ...
Marcus Huber +6 more
doaj +1 more source
Measurement-induced nonlocality based on the trace norm
New Journal of Physics, 2015 Nonlocality is one unique property of quantum mechanics that differs from the classical world. One of its quantifications can be properly described as the maximum global effect caused by locally invariant measurements, known as measurement-induced ...
Ming-Liang Hu, Heng Fan
doaj +1 more source
Bipartite Bell inequalities with three ternary-outcome measurements—from theory to experiments
New Journal of Physics, 2016 We explore quantum nonlocality in one of the simplest bipartite scenarios. Several new facet-defining Bell inequalities for the $\{[3\;3\;3]\;[3\;3\;3]\}$ scenario are obtained with their quantum violations analyzed in details.
Sacha Schwarz +3 more
doaj +1 more source
Reasonable fermionic quantum information theories require relativity
New Journal of Physics, 2016 We show that any quantum information theory based on anticommuting operators must be supplemented by a superselection rule deeply rooted in relativity to establish a reasonable notion of entanglement.
Nicolai Friis
doaj +1 more source
Unlocking fermionic mode entanglement
New Journal of Physics, 2016 Aside from other puzzling features of entanglement, it has been debated whether a physically meaningful notion of entanglement requires two (or more) particles as carriers of the correlated degrees-of-freedom, or if a single particle could be considered ...
Nicolai Friis
doaj +1 more source