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Quantum teleportation analysed by mathematical separation tool

Date:
September 28, 2011
Source:
Springer Science+Business Media
Summary:
Scientists recently gave a theoretical description of teleportation phenomena in sub-atomic scale physical systems.
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Scientists have now shown that mathematical tools give us the freedom to choose how to separate out the constituting matter of a complex physical system by selectively analysing its so-called quantum state.

Scientists from the University of Vienna's Faculty of Physics in Austria recently gave a theoretical description of teleportation phenomena in sub-atomic scale physical systems, in a publication in the European Physical Journal D.

For the first time, the Austrian team has demonstrated that mathematical tools give us the freedom to choose how to separate out the constituting matter of a complex physical system by selectively analysing its so-called quantum state. That is the state in which the system is found when performing measurement, which can either be entangled or not.

The state of entanglement corresponds to a complex physical system in a definite (pure) state, while its parts taken individually are not. This concept of entanglement used in quantum information theory applies when measurement in laboratory A (called Alice) depends on the definite measurement in laboratory B (called Bob), as both measurements are correlated. This phenomenon cannot be observed in larger-scale physical systems.

The findings of the Austrian team show that the entanglement or separability of a quantum state -whether its sub-states are separable or not; i.e., whether Alice and Bob were able to find independent measurements -- depends on the perspective used to assess its status.

A so-called density matrix is used to mathematically describe a quantum state. To assess this state's status, the matrix can be factorised in different ways, similar to the many ways a cake can be cut. The Vienna physicists have shown that by choosing a particular factorisation, it may lead to entanglement or separability; this can, however, only be done theoretically, as experimentally the factorisation is fixed by experimental conditions.


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The above post is reprinted from materials provided by Springer Science+Business Media. Note: Materials may be edited for content and length.


Journal Reference:

  1. W. Thirring, R. A. Bertlmann, P. Köhler, H. Narnhofer. Entanglement or separability: the choice of how to factorize the algebra of a density matrix. The European Physical Journal D, 2011; DOI: 10.1140/epjd/e2011-20452-1

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Springer Science+Business Media. "Quantum teleportation analysed by mathematical separation tool." ScienceDaily. ScienceDaily, 28 September 2011. <www.sciencedaily.com/releases/2011/09/110927112039.htm>.
Springer Science+Business Media. (2011, September 28). Quantum teleportation analysed by mathematical separation tool. ScienceDaily. Retrieved July 8, 2015 from www.sciencedaily.com/releases/2011/09/110927112039.htm
Springer Science+Business Media. "Quantum teleportation analysed by mathematical separation tool." ScienceDaily. www.sciencedaily.com/releases/2011/09/110927112039.htm (accessed July 8, 2015).

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