Is state tomography an unambiguous test of quantum entanglement?

Details Is state tomography an unambiguous test of quantum entanglement? Is state tomography an unambiguous test of quantum entanglement?

2009-05-01

arxiv.org/abs/0905.0158v1

Physical Review Letters Vol.105, 010501 (2010)

Physics

Condensed Matter

Superconductivity

Four pages, two figures

Scientific paper

10.1103/PhysRevLett.105.010501

We provide an alternative interpretation of recently published experimental results that were represented as demonstrating entanglement between two macroscopic quantum Josephson oscillators. We model the experimental system using the well-established classical equivalent circuit of a resistively and capacitively shunted junction. Simulation results are used to generate the corresponding density matrix, which is strikingly similar to the previously published matrix that has been declared to be an unambiguous demonstration of quantum entanglement. Since our data are generated by a classical model, we therefore submit that state tomography cannot be used to determine absolutely whether or not quantum entanglement has taken place. Analytical arguments are given for why the classical analysis provides an adequate explanation of the experimental results.

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