1301.6107 (E. C. Behrman et al.)

On the correction of anomalous phase oscillation in entanglement
witnesses using quantum neural networks    [PDF]

E. C. Behrman, R. E. F. Bonde, J. E. Steck, J. F. Behrman

Entanglement of a quantum system depends upon relative phase in complicated ways, which no single measurement can reflect. Because of this, entanglement witnesses are necessarily limited in applicability and/or utility. We propose here a solution to the problem using quantum neural networks. A quantum system contains the information of its entanglement; thus, if we are clever, we can extract that information efficiently. As proof of concept, we show how this can be done for the case of pure states of a two-qubit system, using an entanglement indicator corrected for the anomalous phase oscillation. Both the entanglement indicator and the phase correction are calculated by the quantum system itself acting as a neural network.

View original: http://arxiv.org/abs/1301.6107