Spin qubits in double quantum dots - entanglement versus the Kondo effect

Abstract

We investigate the competition between pair entanglement of two spin qubits in double quantum dots attached to leads with various topologies and the separate entanglement of each spin with nearby electrodes. Universal behavior of entanglement is demonstrated in dependence on the mutual interactions between the spin qubits, the coupling to their environment, temperature and magnetic field. As a consequence of quantum phase transition an abrupt switch between fully entangled and unentangled states takes place when the dots are coupled in parallel.

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References in corpus (14)

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• Inducing spin-correlations and entanglement in a double quantum dot through non-equilibrium transport
• Entanglement switching via the Kondo effect in triple quantum dots
• Carrier-carrier entanglement and transport resonances in semiconductor quantum dots
• Regular and singular Fermi liquid in triple quantum dots: Coherent transport studies
• Double-quantum-dot Andreev molecules: Phase diagrams and critical evaluation of effective models
• Thermal entanglement of qubit pairs on the Shastry-Sutherland lattice
• Pairwise entanglement and the Mott transition for correlated electrons in nanochains
• Spin selective transport through Aharonov-Bohm and Aharonov-Casher triple quantum dot systems
• Spin-spin correlations of entangled qubit pairs in the Bohm interpretation of quantum mechanics
• Entanglement of electron pairs extracted from a many-body system
• Geometrical view of quantum entanglement
• Quantum entanglement in a pure state of strongly correlated quantum impurity systems
• Diatomic molecule as a quantum entanglement switch
• Entanglement and the Kondo effect in double quantum dots
• Quantum entanglement of space domains occupied by interacting electrons
• The two-impurity Kondo model with spin-orbit interactions