Decoherence dynamics of two charge qubits in vertically coupled quantum dots

Journal Article · Sat Dec 15 00:00:00 EST 2007 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.76.062303· OSTI ID:21140618

Ben Chouikha, W; Bennaceur, R ^[1]; Jaziri, S ^[2]

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1. Laboratoire de Physique de la Matiere Condensee, Departement de Physique, Faculte des Sciences de Tunis, 1060 Tunis (Tunisia)
2. Departement de Physique, Faculte des Sciences de Bizerte, Jarzouna 7021 Bizerte (Tunisia)

The decoherence dynamics of two charge qubits in a double quantum dot is investigated theoretically. We consider the quantum dynamics of two interacting electrons in a vertically coupled quantum dot driven by an external electric field. We derive the equations of motion for the density matrix, in which the presence of an electron confined in the double dot represents one qubit. A Markovian approach to the dynamical evolution of the reduced density matrix is adopted. We evaluate the concurrence of two qubits in order to study the effect of acoustic phonons on the entanglement. We also show that the disentanglement effect depends on the double dot parameters and increases with the temperature.

• OSTI ID: 21140618
• Journal Information: Physical Review. A, Vol. 76, Issue 6; Other Information: DOI: 10.1103/PhysRevA.76.062303; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
DENSITY MATRIX
ELECTRIC FIELDS
ELECTRON-ELECTRON INTERACTIONS
ELECTRONS
EQUATIONS OF MOTION
EVOLUTION
MARKOV PROCESS
PHONONS
QUANTUM COMPUTERS
QUANTUM DECOHERENCE
QUANTUM DOTS
QUANTUM ELECTRODYNAMICS
QUANTUM ENTANGLEMENT
QUANTUM MECHANICS
QUBITS
SIMULATION