Tomographic causal analysis of two-qubit states and tomographic discord
arXiv:1309.4948 · doi:10.1016/j.physleta.2014.04.036
Abstract
We study a behavior of two-qubit states subject to tomographic measurement. We propose a novel approach to definition of asymmetry in quantum bipartite state based on its tomographic Shannon entropies. We consider two types of measurement bases: the first is one that diagonalizes density matrices of subsystems and is used in a definition of tomographic discord, and the second is one that maximizes Shannon mutual information and relates to symmetrical form quantum discord. We show how these approaches relate to each other and then implement them to the different classes of two-qubit states. Consequently, new subclasses of X-states are revealed.
8 pages, 8 figures; comments are welcome; accepted in Physics Letters A
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Cited by in corpus (6)
- Multilevel superconducting circuits as two-qubit systems: Operations, state preparation, and entropic inequalities
- Analytical solutions and criteria for the quantum discord of two-qubit X-states
- Tomograms for open quantum systems: in(finite) dimensional optical and spin systems
- Tomographic discord for a system of two coupled nanoelectric circuits
- Quantum process in probability representation of quantum mechanics
- Protecting quantum systems from decoherence with unitary operations