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Bulletin of the American Physical Society

Detuning dependence of capacitive coupling for quantum dot hybrid qubits

A. A. Setser, J. P. Kestner

Published Mar 5, 2019• 0 citations
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We theoretically examine the capacitive coupling between two quantum dot hybrid qubits, each consisting of three electrons in a double quantum dot, as a function of the energy detuning of the double dot potentials. We show that a shaped detuning pulse can produce a two-qubit maximally entangling operation in $\ensuremath{\sim}50\phantom{\rule{0.28em}{0ex}}\mathrm{ns}$ without having to simultaneously change tunnel couplings. Simulations of the entangling operation in the presence of experimentally realistic charge noise yield two-qubit fidelities over 90%.
We explore the microwave radiation emitted from a biased double quantum dot due to the inelastic tunneling of single charges. Radiation is detected over a broad range of detuning configurations between the dot energy levels, with pronounced maxima occurring in resonance with a capacitively coupled transmission line resonator. The power emitted for forward and reverse resonant detuning is found to be in good agreement with a rate equation model, which considers the hybridization of the individual dot charge states.
Understanding the interactions that couple gate-defined quantum-dot qubits is an important step to using such devices in quantum computing. For double-quantum-dot qubits with an effective charge dipole moment, a capacitive dipole-dipole interaction can yield coherent coupling between neighboring qubits. Here researchers reveal the tunability of this capacitive-coupling energy with applied gate voltages in a quadruple-quantum-dot array, tuning the coupling energy from 15 to 32 GHz. Modeling the system as a network of charge nodes joined by capacitors, the authors demonstrate how the capacitive-coupling energy between pairs of double dots depends on the various capacitances in the network.