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6 papers · 2 filters
Experimentally friendly geometrical criteria for entanglement
P. Badziag, C. Brukner, W. Laskowski +2
We present an intuitive geometrical entanglement criterion. It allows formulation of simple and experimentally friendly sufficient conditions for entanglement. The conditions are i…
Complex projective scheme approach to the geometrical structures of multipartite quantum systems
Hoshang Heydari
In this paper, I will discuss the geometrical structures of multipartite quantum systems based on complex projective schemes. In particular, I will explicitly construct multi-qubit…
Spectra of phase point operators in odd prime dimensions and the extended Clifford group
D. M. Appleby, Ingemar Bengtsson, S. Chaturvedi
We analyse the role of the Extended Clifford group in classifying the spectra of phase point operators within the framework laid out by Gibbons et al for setting up Wigner distribu…
Experimental demonstration of a quantum protocol for Byzantine agreement and liar detection
Sascha Gaertner, Mohamed Bourennane, Christian Kurtsiefer +2
We introduce a new quantum protocol for solving detectable Byzantine agreement (also called detectable broadcast) between three parties, and also for solving the detectable liar de…
A Curious Geometrical Fact About Entanglement
Ingemar Bengtsson
I sketch how the set of pure quantum states forms a phase space, and then point out a curiousity concerning maximally entangled pure states: they form a minimal Lagrangian submanif…
Separability in terms of a single entanglement witness
Piotr Badziąg, Paweł Horodecki, Ryszard Horodecki +1
The separability problem is formulated in terms of a characterization of a single entanglement witness. More specifically, we show that any (in general multipartite) state \varrho…