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- W1570576074 abstract "For every possible spectrum of $2^N$-dimensional density operators, we construct an $N$-qubit X-state of same spectrum and maximal genuine multipartite (GM-) concurrence, hence characterizing a global unitary transformation that --- constrained to output X-states --- maximizes the GM-concurrence of an arbitrary input mixed state of $N$ qubits. We also apply semidefinite programming methods to obtain $N$-qubit X-states with maximal GM-concurrence for a given purity and to provide an alternative proof of optimality of a recently proposed set of density matrices for the role, the so-called X-MEMS. Furthermore, we introduce a numerical strategy to tailor a quantum operation that converts between any two given density matrices using a relatively small number of Kraus operators. We apply our strategy to design short operator-sum representations for the transformation between any given $N$-qubit mixed state and a corresponding X-MEMS of same purity." @default.
- W1570576074 created "2016-06-24" @default.
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- W1570576074 date "2015-05-08" @default.
- W1570576074 modified "2023-10-18" @default.
- W1570576074 title "Maximally genuine multipartite entangled mixed X-states ofN-qubits" @default.
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- W1570576074 doi "https://doi.org/10.1088/1751-8113/48/21/215304" @default.
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