Spatial Entanglement of a Free Bosonic Field

Details Spatial Entanglement of a Free Bosonic Field Spatial Entanglement of a Free Bosonic Field

2006-07-11

arxiv.org/abs/quant-ph/0607069v3

Physics

Quantum Physics

5 pages, 4 figures, extended version of the paper from 5 to 8 pages. We have included a more detailed discussion and added new

Scientific paper

In this paper we discuss the entanglement properties of a thermal non-relativistic free bosonic field. We demonstrate how to formally construct spatial modes in order to use a continuous variable separability criterion and show that the construction of the modes plays a significant role in the way the entanglement manifests itself. For instance the presence of entanglement depends on the shape of the modes and their separation. The temperature of the gas is another crucial factor and for one choice of modes we show that entanglement can be found at arbitrarily high temperatures as long as we can zoom in on suitably small regions in space. Moreover, we show that the entanglement here is useful as it can be extracted to a pair of localised systems.

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