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Showing 2011 · quant-phShow all
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quant-ph2011★ 157 cited
Extremal properties of the variance and the quantum Fisher information
Geza Toth, Denes Petz
We show that the variance is its own concave roof. For rank-2 density matrices and operators with zero diagonal elements in the eigenbasis of the density matrix, we prove analytica…
quant-ph2011★ 33 cited
Non-Markovian Open Quantum Systems: Input-Output Fields, Memory, Monitoring
Lajos Diósi
Principles of monitoring non-Markovian open quantum systems are analyzed. We use the field representation of the environment (Gardiner and Collet, 1985) for the separation of its m…