Suppression of nuclear spin bath fluctuations in self-assembled quantum dots induced by inhomogeneous strain

• DOI: 10.1038/ncomms7348
• Publication Date: 2015-02-23T10:24:36Z
• Authors: E.A. Chekhovich; M. Hopkinson; M.S. Skolnick; A.I. Tartakovskii
• Keywords: 0103 physical sciences; 01 natural sciences; Article

Interaction with nuclear spins leads to decoherence and information loss in solid-state electron-spin qubits. One particular, ineradicable source of electron arises from the spin bath, driven by nuclear-nuclear dipolar interactions. Owing its many-body nature is difficult predict, especially for an important class strained nanostructures where quadrupolar effects have a significant but largely unknown impact. Here, we report direct measurement bath coherence individual self-assembled InGaAs/GaAs quantum dots: spin-echo times range 1.2-4.5 ms are found. Based on these values, demonstrate that strain-induced interactions make fluctuations much slower compared lattice-matched GaAs/AlGaAs structures. Our findings can potentially be used engineer optically active III-V semiconductor spin-qubits nearly noise-free previously achievable only spin-0 semiconductors, qubit network interconnection scaling challenging.