Tomographic discord for a system of two coupled nanoelectric circuits

Abstract

We consider quantum correlations and quantum discord phenomena for two-qubit states with $X$-type density matrices in the tomographic framework of quantum mechanics. By introducing different measurements schemes, we establish the relation between tomographic approach to quantum discord, symmetric discord, and measurement-induced disturbance. In our consideration, $X$-states appear as approximations of ground and low temperature thermal states of two coupled harmonic oscillators realized by nanoelectric $LC$-circuits. Possibilities for control the amounts of correlations and entropic asymmetry due to variation of the frequency detuning and the coupling constant are also considered.

13 pages, 5 figures; published version

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Cited by in corpus (3)

• Multilevel superconducting circuits as two-qubit systems: Operations, state preparation, and entropic inequalities
• Information processing using three-qubit and qubit-qutrit encodings of noncomposite quantum systems
• Local available quantum correlations of X states: The symmetric and anti-symmetric cases