Decoherence of coupled electron spins via nuclear spin dynamics in quantum dots

Abstract

In double quantum dots, the exchange interaction between two electron spins renormalizes the excitation energy of pair-flips in the nuclear spin bath, which in turn modifies the non-Markovian bath dynamics. As the energy renormalization varies with the Overhauser field mismatch between the quantum dots, the electron singlet-triplet decoherence resulting from the bath dynamics depends on sampling of nuclear spin states from an ensemble, leading to the transition from exponential decoherence in single-sample dynamics to power-law decay under ensemble averaging. In contrast, the decoherence of a single electron spin in one dot is essentially the same for different choices of the nuclear spin configuration.

4 pages 3 figures

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Cited by in corpus (16)

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• Quantum many-body theory for electron spin decoherence in nanoscale nuclear spin baths
• Quantum many-body theory of qubit decoherence in a finite-size spin bath. II. Ensemble dynamics
• Wavefunction considerations for the central spin decoherence problem in a nuclear spin bath
• Master equation approach to the central spin decoherence problem: the uniform coupling model and the role of projection operators
• Two-spin dephasing by electron-phonon interaction in semiconductor double quantum dots
• General theory of feedback control of a nuclear spin ensemble in quantum dots
• Decoherence of an exchange qubit by hyperfine interaction
• Hyperfine interaction induced dephasing of coupled spin qubits in semiconductor double quantum dots
• Dynamics of entanglement of two electron spins interacting with nuclear spin baths in quantum dots
• Cluster-correlation expansion for studying decoherence of clock transitions in spin baths
• Atomic-scale positioning of single spins via multiple nitrogen-vacancy centers
• Estimation of the spatial decoherence time in circular quantum dots
• Spin-orbit torque on nuclear spins exerted by a spin accumulation via hyperfine interactions
• Limitations on the maximal level of entanglement of two singlet-triplet qubits in GaAs quantum dots