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4 papers · 1 filter
\ell^1-spreading models in subspaces of mixed Tsirelson spaces
Denny H. Leung, Wee-Kee Tang
We investigate the existence of higher order \ell^1-spreading models in subspaces of mixed Tsirelson spaces. For instance, we show that the following conditions are equivalent for…
The isometries of the cut, metric and hypermetric cones
Antoine Deza, Boris Goldengorin, Dmitrii V. Pasechnik
We show that the symmetry groups of the cut cone Cut(n) and the metric cone Met(n) both consist of the isometries induced by the permutations on {1,...,n}; that is, Is(Cut(n))=Is(M…
An experimental observation of geometric phases for mixed states using NMR interferometry
Jiangfeng Du, Ping Zou, Mingjun Shi +6
Examples of geometric phases abound in many areas of physics. They offer both fundamental insights into many physical phenomena and lead to interesting practical implementations. O…
Direct estimation of functionals of density operators by local operations and classical communication
Carolina Moura Alves, Pawel Horodecki, Daniel K. L. Oi +2
We present a method of determining important properties of a shared bipartite quantum state, within the ``distant labs'' paradigm, using \emph{only} local operations and classical…