C. Macchiavello, M. Rossi
We present a method to detect properties of quantum noisy channels, assuming that some a priori information about the form of the channel is available. The method is based on a correspondence with entanglement detection methods for multipartite density matrices based on witness operators. We illustrate the method in the case of entanglement breaking channels and non separable random unitary channels, and show how it can be implemented experimentally by means of local measurements.
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http://arxiv.org/abs/1208.5121
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