Randomly distilling W-class states into general configurations of two-party entanglement. Cui, W., Chitambar, E., & Lo, H., K. Physical Review A - Atomic, Molecular, and Optical Physics, 84(5):1-11, 2011.
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In this article we obtain results for the task of converting a single N-qubit W-class state (of the form √x0|00...0+√x 1|10...0++√xN|00...1) into maximum entanglement shared between two random parties. Previous studies in random distillation have not considered how the particular choice of target pairs affects the transformation, and here we develop a strategy for distilling into general configurations of target pairs. We completely solve the problem of determining the optimal distillation probability for all three-qubit configurations and most four-qubit configurations when x0=0. Our proof involves deriving new entanglement monotones defined on the set of four-qubit W-class states. As an additional application of our results, we present new upper bounds for converting a generic W-class state into the standard W state |W N=√1N(|10...0++|00...1). © 2011 American Physical Society.
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 title = {Randomly distilling W-class states into general configurations of two-party entanglement},
 type = {article},
 year = {2011},
 pages = {1-11},
 volume = {84},
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 abstract = {In this article we obtain results for the task of converting a single N-qubit W-class state (of the form √x0|00...0+√x 1|10...0++√xN|00...1) into maximum entanglement shared between two random parties. Previous studies in random distillation have not considered how the particular choice of target pairs affects the transformation, and here we develop a strategy for distilling into general configurations of target pairs. We completely solve the problem of determining the optimal distillation probability for all three-qubit configurations and most four-qubit configurations when x0=0. Our proof involves deriving new entanglement monotones defined on the set of four-qubit W-class states. As an additional application of our results, we present new upper bounds for converting a generic W-class state into the standard W state |W N=√1N(|10...0++|00...1). © 2011 American Physical Society.},
 bibtype = {article},
 author = {Cui, W. and Chitambar, E. and Lo, H. K.},
 doi = {10.1103/PhysRevA.84.052301},
 journal = {Physical Review A - Atomic, Molecular, and Optical Physics},
 number = {5}
}

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