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Erschienen in:
01.04.2019
Phase diagram for the one-way quantum deficit of two-qubit X states
Erschienen in: Quantum Information Processing | Ausgabe 4/2019
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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 \(\varDelta _0\) and \(\varDelta _{\pi /2}\) which are characterized by constant (i.e., universal) optimal measurement angles, correspondingly, zero and \(\pi /2\) with respect to the z-axis and a third phase \(\varDelta _\vartheta \) 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 \(\varDelta _\vartheta \) is large and achieves the sizes comparable to those of regions \(\varDelta _0\) and \(\varDelta _{\pi /2}\). This instils hope to detect the mysterious fraction of quantum correlation with the variable optimal measurement angle experimentally.