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14 papers · 2 filters
On the entanglement structure in quantum cloning
D. Bruss, C. Macchiavello
We study the entanglement properties of the output state of a universal cloning machine. We analyse in particular bipartite and tripartite entanglement of the clones, and discuss t…
Construction of extremal local positive operator-valued measures under symmetry
S. Virmani, M. B. Plenio
We study the local implementation of POVMs when we require only the faithful reproduction of the statistics of the measurement outcomes for all initial states. We first demonstrate…
Local observables for entanglement witnesses
G. Mauro D'Ariano, Chiara Macchiavello, Matteo G. A. Paris
We present an explicit construction of entanglement witnesses for depolarized states in arbitrary finite dimension. For infinite dimension we generalize the construction to twin-be…
Spin tomography
G. M. D'Ariano, L. Maccone, M. Paini
We propose a tomographic reconstruction scheme for spin states. The experimental setup, which is a modification of the Stern-Gerlach scheme, can be easily performed with currently…
The information-theoretical viewpoint on the physical complexity of classical and quantum objects and their dynamical evolution
Gavriel Segre
Charles Bennett's measure of physical complexity for classical objects, namely logical-depth, is used in order to prove that a chaotic classical dynamical system is not physical co…
Experimental detection of entanglement via witness operators and local measurements
O. Guehne, P. Hyllus, D. Bruss +4
In this paper we address the problem of detection of entanglement using only few local measurements when some knowledge about the state is given. The idea is based on an optimized…