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Charge qubit entanglement in double quantum dots

S. Weiss, M. Thorwart and R. Egger

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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.


PACS

03.65.Ud Entanglement and quantum nonlocality (e.g. EPR paradox, Bell's inequalities, GHZ states, etc.)

73.23.-b Electronic transport in mesoscopic systems

73.21.La Quantum dots

Subjects

Surfaces, interfaces and thin films

Nanoscale science and low-D systems

Quantum information and quantum mechanics

Dates

Issue 5 (December 2006)

Received 21 July 2006, accepted for publication 4 October 2006, in final form 4 October 2006

Published 1 November 2006



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