Phys. Scr., 2015, Volume 90, Issue 5, 55101, 13 pp.
Tomographic discord for a system of two coupled nanoelectric circuits
A. K. Fedorovab, E. O. Kiktenkoac, O. V. Man'kod, V. I. Man'kod
a Bauman Moscow State Technical University, Moscow 105005, Russi
b Russian Quantum Center, Skolkovo, Moscow 143025, Russia
c Geoelectromagnetic Research Center of the Schmidt Institute of Physics of the Earth, Russian Academy of Sciences, Troitsk, Moscow Region 142190, Russia
d P.N. Lebedev Physical Institute, Russian Academy of Sciences, Moscow 119991, Russia
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 measurement schemes, we establish the relation between the tomographic approaches 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 controlling the amounts of correlations and entropic asymmetry due to variation of the frequency detuning and the coupling constant are also considered.
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