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arXiv · 1507.07198

Microwave quantum optics as a direct probe of the Overhauser field in a quantum-dot CQED device

Pei-Qing Jin·Jan Jeske·Andrew D. Greentree·Jared H. Cole
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Abstract

We show theoretically that a quantum-dot circuit quantum electrodynamics (CQED) device can be used as a probe of the Overhauser field in quantum dots. By coupling a transmission line to the interdot tunneling gate, an electromagnetically-induced-transparency (EIT) scheme can be established, whose Fano-type interference leads to a sharp curvature in the reflection spectrum around resonance. This sharp feature persists even in the presence of the fluctuating spin bath, rendering a high-resolution method to extract the bath's statistical information. For strong nuclear spin fields, the reflection spectrum exhibits an Autler-Townes splitting, where the peak locations indicate the strengths of the Overhauser field gradient (OFG).

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Pei-Qing Jin, Jan Jeske, Andrew D. Greentree, Jared H. Cole. 2015-07-26. Microwave quantum optics as a direct probe of the Overhauser field in a quantum-dot CQED device. https://doi.org/10.1103/physrevb.103.045301

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