Zobrazeno 1 - 10
of 405
pro vyhledávání: '"Bruß, D."'
Autor:
Gühne, O., Cuquet, M., Steinhoff, F. E. S., Moroder, T., Rossi, M., Bruß, D., Kraus, B., Macchiavello, C.
Publikováno v:
J. Phys. A: Math. Theor. 47, 335303 (2014)
Hypergraph states are multi-qubit states that form a subset of the locally maximally entangleable states and a generalization of the well--established notion of graph states. Mathematically, they can conveniently be described by a hypergraph that ind
Externí odkaz:
http://arxiv.org/abs/1404.6492
Publikováno v:
Phys. Scr. T160, 014036 (2014)
We study the entanglement content of the states employed in the Grover algorithm after the first oracle call when a few searched items are concerned. We then construct a link between these initial states and hypergraphs, which provides an illustratio
Externí odkaz:
http://arxiv.org/abs/1404.1285
Publikováno v:
Phys. Rev. B 89, 125117 (2014)
We show how the entanglement contained in states of spins arranged on a lattice may be quantified with observables arising in scattering experiments. We focus on the partial differential cross-section obtained in neutron scattering from magnetic mate
Externí odkaz:
http://arxiv.org/abs/1310.0929
Publikováno v:
New J. Phys. 15, 113022 (2013)
We introduce a class of multiqubit quantum states which generalizes graph states. These states correspond to an underlying mathematical hypergraph, i.e. a graph where edges connecting more than two vertices are considered. We derive a generalised sta
Externí odkaz:
http://arxiv.org/abs/1211.5554
Publikováno v:
Phys. Rev. A 87, 012313 (2013)
We show that only those composite quantum systems possessing nonvanishing quantum correlations have the property that any nontrivial local unitary evolution changes their global state. We derive the exact relation between the global state change indu
Externí odkaz:
http://arxiv.org/abs/1206.4075
Publikováno v:
Phys. Rev. A 87, 022331 (2013)
We calculate the amount of entanglement of the multiqubit quantum states employed in the Grover algorithm, by following its dynamics at each step of the computation. We show that genuine multipartite entanglement is always present. Remarkably, the dy
Externí odkaz:
http://arxiv.org/abs/1205.3000
Publikováno v:
Phys. Rev. A 84, 042326 (2011)
We revisit the problem of discriminating orthogonal quantum states within the local quantum operation and classical communication (LOCC) paradigm. Our particular focus is on the asymptotic situation where the parties have infinite resources and the p
Externí odkaz:
http://arxiv.org/abs/1105.5132
Publikováno v:
Phys. Rev. Lett. 105, 250501 (2010)
We present an experimental method to produce 4-qubit phased Dicke states, based on a source of 2-photon hyperentangled states. By introducing quantum noise in the multipartite system in a controlled way, we have tested the robustness of these states.
Externí odkaz:
http://arxiv.org/abs/1007.4996
Autor:
Bruß, D., Macchiavello, C.
Publikováno v:
Phys. Rev. A 83, 052313 (2011)
We investigate the entanglement features of the quantum states employed in quantum algorithms. In particular, we analyse the multipartite entanglement properties in the Deutsch-Jozsa, Grover and Simon algorithms. Our results show that for these algor
Externí odkaz:
http://arxiv.org/abs/1007.4179
Publikováno v:
Phys. Rev. A 81, 040304(R) (2010)
We use Nuclear Magnetic Resonance (NMR) to experimentally generate a bound entangled (more precisely: pseudo bound entangled) state, i.e. a quantum state which is non-distillable but nevertheless entangled. Our quantum system consists of three qubits
Externí odkaz:
http://arxiv.org/abs/0909.2743