Quantum memory and entanglement of two dipole-coupled semiconductor qubit states: dipole–dipole interaction and Coulomb-electron interactions

Abstract

In this study, we explore the behavior of the entropic uncertainty, its lower bound, and the negativity of the quantum-dot state of paired electrons as the couplings of the tunneling k-inter-dot tunneling, the dipole–dipole interaction, and the Coulomb-electron interaction increase. Notably, the thermal entropic uncertainty of two-electron qubits, its lower bound, and negativity show a high sensitivity to increase in Coulomb-electron coupling. Our findings suggest that stronger dipole coupling enhances the interplay between entropic uncertainty and quantum entanglement. This highlights the considerable dependence of the thermal qubit behavior on the strength of the dipole interactions. These results indicate the essential role of dipole coupling in influencing the thermal properties and entanglement characteristics of two-electron qubits.