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Microwave quantum optics as a direct probe of the Overhauser field in a quantum dot circuit quantum electrodynamics device

: Jin, Pei-Quing; Jeske, Jan; Greentree, Andrew D.; Cole, Jared H.


Physical Review. B 103 (2021), Nr.4, Art. 045301, 6 S.
ISSN: 0163-1829
ISSN: 1098-0121
ISSN: 0556-2805
ISSN: 2469-9950
Bundesministerium für Bildung und Forschung BMBF (Deutschland)
Fraunhofer IAF ()

We show theoretically that a quantum dot circuit quantum electrodynamics 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 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.