Non-local nuclear spin quieting in quantum dot molecules: Optically-induced extended two-electron spin coherence time

Abstract

We demonstrate the extension of coherence between all four two-electron spin ground states of an InAs quantum dot molecule (QDM) via non-local suppression of nuclear spin fluctuations in both constituent quantum dots (QDs), while optically addressing only the upper QD transitions. Long coherence times are revealed through dark-state spectroscopy as resulting from nuclear spin locking mediated by the exchange interaction between the QDs. Lineshape analysis provides the first measurement of the quieting of the Overhauser field distribution correlating with reduced nuclear spin fluctuations.

arXiv commentSupplementary materials can be found on the publication page of our website. http://research.physics.lsa.umich.edu/dst/Publications.html

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• Classification of Dark States in Multi-level Dissipative Systems
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• The magneto-optics in quantum wires comprised of vertically stacked quantum dots: A calling for the magnetoplasmon qubits
• Single-particle and collective excitations in quantum wires comprised of vertically stacked quantum dots: Finite magnetic field
• Direct high resolution resonant Raman scattering measurements of InAs quantum dot dynamic nuclear spin polarization states
• Effective quasiparticle approach for a Cavity-QDots System