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- Oliver Thewalt added a new video Japanese Scientist may have found a way to predict really big earthquakes(HawaiiNewsNow) - A Japanese Scientist may have found a way to predict really big earthquakes. His discovery could radically change seismology as Howard Dicus reports. The magnitude nine earthquake that devastated Japan on march 11th did something...
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- Rice University physicists have built an accurate model of part of the solar system inside a single atom. In a new paper in Physical Review Letters, Rice's team and collaborators from Oak Ridge National Laboratory and the Vienna University of...
- Oliver Thewalt commented on a bookmark Hitchin functionals are related to measures of entanglementhttp://en.wikipedia.org/wiki/Greenberger%E2%80%93Horne%E2%80%93Zeilinger_state
- Oliver Thewalt commented on a bookmark Hitchin functionals are related to measures of entanglementThree qubits can be entangled in two inequivalent ways W. Dür, G. Vidal, J. I. Cirac (Submitted on 26 May 2000 (v1), last revised 8 Jun 2000 (this version, v2)) Invertible local transformations of a multipartite system are used to...
- Hitchin functionals are related to measures of entanglement Péter Lévay, Gábor Sárosi (Submitted on 22 Jun 2012) According to the Black Hole/Qubit Correspondence (BHQC) certain black hole entropy formulas in...
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Three qubits can be entangled in two inequivalent ways

W. Dür, G. Vidal, J. I. Cirac

(Submitted on 26 May 2000 (v1), last revised 8 Jun 2000 (this version, v2))Invertible local transformations of a multipartite system are used to define equivalence classes in the set of entangled states. This classification concerns the entanglement properties of a single copy of the state. Accordingly, we say that two states have the same kind of entanglement if both of them can be obtained from the other by means of local operations and classical communcication (LOCC) with nonzero probability. When applied to pure states of a three-qubit system, this approach reveals the existence of two inequivalent kinds of genuine tripartite entanglement, for which the GHZ state and a W state appear as remarkable representatives. In particular, we show that the W state retains maximally bipartite entanglement when any one of the three qubits is traced out. We generalize our results both to the case of higher dimensional subsystems and also to more than three subsystems, for all of which we show that, typically, two randomly chosen pure states cannot be converted into each other by means of LOCC, not even with a small probability of success.