Multiqubit entanglement of a general input state

Details Multiqubit entanglement of a general input state Multiqubit entanglement of a general input state

2011-08-06

arxiv.org/abs/1108.1955v1

Physics

Quantum Physics

10 pages, 9 tables, 9 figures; submitted to Phys Rev A (August 2011)

Scientific paper

Measurement of entanglement remains an important problem for quantum information. We present the design and simulation of an experimental method for entanglement estimation for a general multiqubit state. The system can be in a pure or a mixed state, and it need not be "close" to any particular state. Our method, based on dynamic learning, does not require prior state reconstruction or lengthy optimization. Results for three-qubit systems compare favorably with known entanglement measures. The method is then extended to four- and five-qubit systems, with relative ease. As the size of the system grows the amount of training necessary diminishes, raising hopes for applicability to large computational systems.

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