Optimal control of entanglement via quantum feedback
- 24 January 2007
- journal article
- Published by American Physical Society (APS) in Physical Review A
- Vol. 75 (1)
- https://doi.org/10.1103/physreva.75.012330
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)].Full TexKeywords
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