Probing entropic uncertainty and quantum correlations in a quadruple quantum dot device for two charge qubits

We analyze the quantum correlations, the quantum-memory-assisted entropic uncertainty (QMA-EUR), and its lower bound in a quadruple quantum dot device for two charge qubits. Herein, we select incompatible Pauli operators \hat \sigma _x and \hat \sigma _z as a pair of observables of interest for the measurement of particle A, and the uncertainty can be predicted from the entanglement of particle A with quantum memory B. We explore the dynamics of quantum discord and QMA-EUR, taking into account the effects of electron temperature, energy offsets, tunneling coupling, and the strength of coupling (i.e., the Coulomb interaction between electrons). Interestingly, our results indicate that there are certain adjustable parameters that can be tuned to suppress the entropy uncertainty bound and enhance quantum correlations.