Spin entanglement induced by spin-orbit interactions in coupled quantum dots

Abstract

We theoretically explore the possibility of creating spin quantum entanglement in a system of two electrons confined respectively in two vertically coupled quantum dots in the presence of Rashba type spin-orbit coupling. We find that the system can be described by a generalized Jaynes - Cummings model of two modes bosons interacting with two spins. The lower excitation states of this model are calculated to reveal the underlying physics of the far infrared absorption spectra. The analytic perturbation approach shows that an effective transverse coupling of spins can be obtained by eliminating the orbital degrees of freedom in the large detuning limit. Here, the orbital degrees of freedom of the two electrons, which are described by two modes of bosons, serve as a quantized data bus to exchange the quantum information between two electrons. Then a nontrivial two-qubit logic gate is realized and spin entanglement between the two electrons is created by virtue of spin-orbit coupling.

7 pages, 5 figures

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Cited by in corpus (11)

• Suppression of spin relaxation in an InAs nanowire double quantum dot
• The effect of spin-orbit interaction on entanglement of two-qubit Heisenberg XYZ systems in an inhomogeneous magnetic field
• Theory of anisotropic exchange in laterally coupled quantum dots
• Spin-spin coupling in electrostatically coupled quantum dots
• Spin-orbit coupling and anisotropic exchange in two-electron double quantum dots
• The energy level crossing behavior and quantum Fisher information in a quantum well with spin-orbit coupling
• Time dependent configuration interaction simulations of spin swap in spin orbit coupled double quantum dots
• Creation of Entanglement between Two Electron Spins Induced by Many Spin Ensemble Excitations
• Spin-orbit effects on two-electron states in nanowhisker double quantum dots
• Entanglement of spin-orbit qubits induced by Coulomb interaction
• Indirect control of spin precession by electric field via spin-orbit coupling