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American Physical Society, Physical Review A, 1(75), 2007

DOI: 10.1103/physreva.75.012330

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Optimal control of entanglement via quantum feedback

Journal article published in 2006 by Stefano Mancini, Howard Mark Wiseman ORCID
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This paper is available in a repository.

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Abstract

It has recently been shown that finding the optimal measurement on the environment for stationary Linear Quadratic Gaussian control problems is a semi-definite program. We apply this technique to the control of the EPR-correlations between two bosonic modes interacting via a parametric Hamiltonian at steady state. The optimal measurement turns out to be nonlocal homodyne measurement -- the outputs of the two modes must be combined before measurement. We also find the optimal local measurement and control technique. This gives the same degree of entanglement but a higher degree of purity than the local technique previously considered [S. Mancini, Phys. Rev. A {\bf 73}, 010304(R) (2006)]. Yes Yes