Global versus local optimality in feedback-controlled qubit purification: new insights from minimizing Rényi entropies

Abstract

It was first shown by Jacobs, in 2003, that the process of qubit state purification by continuous measurement of one observable can be enhanced, on average, by unitary feedback control. Here, we quantify this by the reduction in any one of the family of Rényi entropies α S , with α < < ∞ 0 , at some terminal time, revealing the rich structure of stochastic… (More)

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Cite this paper

@inproceedings{Teo2014GlobalVL, title={Global versus local optimality in feedback-controlled qubit purification: new insights from minimizing Rényi entropies}, author={Colin Teo and Joshua Combes and Howard M. Wiseman}, year={2014} }