Quantification and scaling of multipartite entanglement in continuous variable systems

Details Quantification and scaling of multipartite entanglement in continuous variable systems Quantification and scaling of multipartite entanglement in continuous variable systems

2004-06-09

arxiv.org/abs/quant-ph/0406053v2

Phys.Rev.Lett. 93 (2004) 220504

Physics

Quantum Physics

4 pages, 2 figures; to be published in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.93.220504

We present a theoretical method to determine the multipartite entanglement between different partitions of multimode, fully or partially symmetric Gaussian states of continuous variable systems. For such states, we determine the exact expression of the logarithmic negativity and show that it coincides with that of equivalent two--mode Gaussian states. Exploiting this reduction, we demonstrate the scaling of the multipartite entanglement with the number of modes and its reliable experimental estimate by direct measurements of the global and local purities.

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