Hyperfine induced spin and entanglement dynamics in Double Quantum Dots: A homogeneous coupling approach

Abstract

We investigate hyperfine induced electron spin and entanglement dynamics in a system of two quantum dot spin qubits. We focus on the situation of zero external magnetic field and concentrate on approximation-free theoretical methods. We give an exact solution of the model for homogeneous hyperfine coupling constants (with all coupling coefficients being equal) and varying exchange coupling, and we derive the dynamics therefrom. After describing and explaining the basic dynamical properties, the decoherence time is calculated from the results of a detailed investigation of the short time electron spin dynamics. The result turns out to be in good agreement with experimental data.

10 pages, 8 figures

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Cited by in corpus (13)

• Rabi oscillations, decoherence, and disentanglement in a qubit-spin-bath system: exact dynamics
• Sensitivity of the decay of entanglement of quantum dot spin qubits to the magnetic field
• Dynamics of entanglement of two electron spins interacting with nuclear spin baths in quantum dots
• Different types of integrability and their relation to decoherence in central spin models
• Theory of box-model hyperfine couplings and transport signatures of long-range nuclear-spin coherence in a quantum-dot spin valve
• Coherence of an extended central spin model with a coupled spin bath
• Dynamical nuclear spin polarization induced by electronic current through double quantum dots
• Temperature-dependent dynamical nuclear polarization bistabilities in double quantum dots in the spin-blockade regime
• Hyperfine induced electron spin and entanglement dynamics in double quantum dots: The case of separate baths
• Swapping and entangling hyperfine coupled nuclear spin baths
• Perturbative regimes in central spin models
• Dynamics of quantum entanglement in the reservoir with memory effects
• Thermal electron spin flip in quantum dots