Limitations on the Creation of Maximal Entanglement

Details Limitations on the Creation of Maximal Entanglement Limitations on the Creation of Maximal Entanglement

2000-01-21

arxiv.org/abs/quant-ph/0001080v2

Phys. Rev. A 62, 064301 (2000)

Physics

Quantum Physics

5 pages, 2 figures REVTeX

Scientific paper

10.1103/PhysRevA.62.064301

We study a limited set of optical circuits for creating near maximal polarisation entanglement {\em without} the usual large vacuum contribution. The optical circuits we consider involve passive interferometers, feed-forward detection, down-converters and squeezers. For input vacuum fields we find that the creation of maximal entanglement using such circuits is impossible when conditioned on two detected auxiliary photons. So far, there have been no experiments with more auxiliary photons. Thus, based on the minimum complexity of the circuits required, if near maximal polarisation entanglement is possible it seems unlikely that it will be implemented experimentally with the current resources.

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