Charge qubit entanglement in double quantum dots

Abstract

We study entanglement of charge qubits in a vertical tunnel-coupled double quantum dot containing two interacting electrons. Exact diagonalization is used to compute the negativity characterizing entanglement. We find that entanglement can be efficiently generated and controlled by sidegate voltages, and describe how it can be detected. For large enough tunnel coupling, the negativity shows a pronounced maximum at an intermediate interaction strength within the Wigner molecule regime.

revised version of the manuscript, as published in EPL, 7 pages, 4 figures

References in corpus (3)

• Direct Observation of Controlled Coupling in an Individual Quantum Dot Molecule
• Direct control of the tunnel splitting in a one-electron double quantum dot
• Path-integral Monte Carlo simulations for interacting few-electron quantum dots with spin-orbit coupling

Cited by in corpus (5)

• A non-Markovian decoherence theory for double dot charge qubit
• Wigner localization in quantum dots from Kohn-Sham density functional theory without symmetry breaking
• Wave packet construction in three-dimensional quantum billiards: Visualizing the closed orbit, collapse and revival of wave packets in the cubical billiard
• Electronic Correlations in Double Quantum Dots
• A Finite Element Configuration Interaction Method for Wigner Localization