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arXiv · 1804.03755

Phase diagram for the one-way quantum deficit of two-qubit X states

M. A. Yurischev
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Abstract

The one-way quantum deficit, a measure of quantum correlation, can exhibit for X quantum states the regions (subdomains) with the phases $Δ_0$ and $Δ_{π/2}$ which are characterized by constant (i.e., universal) optimal measurement angles, correspondingly, zero and $π/2$ with respect to the $z$-axis and a third phase $Δ_\vartheta$ with the variable (state-dependent) optimal measurement angle $\vartheta$. We build the complete phase diagram of one-way quantum deficit for the XXZ subclass of symmetric X states. In contrast to the quantum discord where the region for the phase with variable optimal measurement angle is very tiny (more exactly, it is a very thin layer), the similar region $Δ_\vartheta$ is large and achieves the sizes comparable to those of regions $Δ_0$ and $Δ_{π/2}$. This instils hope to detect the mysterious fraction of quantum correlation with the variable optimal measurement angle experimentally.

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M. A. Yurischev. 2018-11-09. Phase diagram for the one-way quantum deficit of two-qubit X states. https://doi.org/10.1007/s11128-019-2243-4

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