The resistance of quantum entanglement to temperature in the Kugel-Khomskii model

The Kugel--Khomskii model with entangled spin and orbital degrees of freedom is a good testing ground for many important features in quantum information processing, such as robust gaps in the entanglement spectra. Here, we demonstrate that the entanglement can be also robust under effect of temperat...

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Hauptverfasser: Valiulin, V E, Mikheyenkov, A V, Chtchelkatchev, N M, Kugel, K I
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Mikheyenkov, A V
Chtchelkatchev, N M
Kugel, K I
description The Kugel--Khomskii model with entangled spin and orbital degrees of freedom is a good testing ground for many important features in quantum information processing, such as robust gaps in the entanglement spectra. Here, we demonstrate that the entanglement can be also robust under effect of temperature within a wide range of parameters. It is shown, in particular, that the temperature dependence of entanglement often exhibits a nonmonotonic behavior. Namely, there turn out to be ranges of the model parameters, where entanglement is absent at zero temperature, but then, with an increase in temperature, it appears, passes through a maximum, and again vanishes.
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subjects Data processing
Mathematical models
Parameters
Quantum entanglement
Quantum phenomena
Robustness
Temperature
Temperature dependence
Temperature effects
title The resistance of quantum entanglement to temperature in the Kugel-Khomskii model
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