Pairwise quantum correlations in four-level quantum dot systems

Abstract

In this paper we assume quantum dots can be assimilated to Fermi Hubbard sites when the Coulomb interaction between electrons is higher compared to their tunneling. The study of pairwise entanglement in a small size array of quantum dots allows to model each pair as a quadrit-quadrit system (4 $\times$ 4 mixed state) instead of the more common and simplistic approach of describing it in quantum information as a qubit-qubit system. We study the effect of Coulomb interaction and temperature on pairwise entanglement as well as on quantum coherence and total correlations. The crucial results of this study are that entanglement resists better the increase in temperature when the Coulomb interaction is stronger. Moreover, we successfully explain the behavior of these correlations in terms of the energy spectrum, namely the ground state degeneracy and the state energy difference.

References in corpus (6)

• Concurrence of arbitrary dimensional bipartite quantum states
• Measuring Multipartite Concurrence with a Single Factorizable Observable
• Quantum simulation of Fermi-Hubbard models in semiconductor quantum dot arrays
• Hubbard model description of silicon spin qubits: charge stability diagram and tunnel coupling in Si double quantum dots
• The Hubbard model as an approximation to the entanglement in nanostructures
• Quantum Correlations Dynamics In Two Coupled Semiconductor InAs Quantum Dots