Charge qubit entanglement in double quantum dots

2006/01/31 by S Weiss, S. Weiss, M. Thorwart +3 · 1 citation
Chemistry · Physics and Astronomy · #Advanced Physical and Chemical Molecular Interactions #Quantum and electron transport phenomena #Semiconductor Quantum Structures and Devices #cond-mat.other #quant-ph

paper · pdf · doi:10.1209/epl/i2006-10342-y

published as Europhys. Lett. 76 (5) 905-911 (2006) · revised version of the manuscript, as published in EPL, 7 pages, 4 figures

openalex publication_date 2006/12/01 · arxiv created 2006/12/04 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/30

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.

Citations

• Electronic structure of quantum dots
• Entanglement of Formation of an Arbitrary State of Two Qubits
• A comparison of the entanglement measures negativity and concurrence
• Separability Criterion for Density Matrices
• Coherent Manipulation of Coupled Electron Spins in Semiconductor Quantum Dots

Cited by

• Electronic correlations in double quantum dots