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arXiv · 2608.02388

A high-Q Split Cavity Enabling Independent Electrical Tuning of two Quantum Dots

Lan Hoang Mai·Nazifa Tasnim Arony·R S Joshya·Tyler Manfre·Joshua M. O. Zide·Matthew F. Doty
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Abstract

Cavity-mediated strong coupling is an essential tool for quantum photonics. However, the inherent inhomogeneity in ensembles of matter-based qubits necessitates independent tuning to bring more than one qubit into resonance with a single cavity mode. We present the design, fabrication, and characterization of a GaAs-based photonic crystal split cavity that consists of two electrically-distinct portions, which preserves the ability to apply independent electric fields that would independently tune two distinct qubits based on InAs Quantum Dots (QDs) into resonance with a cavity mode. We show that this device, despite the cut required to electrically isolate the two halves, achieves an average Q $\geq 20,000$, sufficient to enter the strong coupling regime. Moreover, we show that the Q is limited primarily by the precision and accuracy of the e-beam lithography tool, rather than by sidewall scattering. This result creates a realistic experimental path toward devices that use controlled interactions between two InAs QDs, mediated by strong coupling to a single cavity mode, to generate multi-dimensional photon graph states.

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Lan Hoang Mai, Nazifa Tasnim Arony, R S Joshya, Tyler Manfre, Joshua M. O. Zide, Matthew F. Doty. 2026-08-03. A high-Q Split Cavity Enabling Independent Electrical Tuning of two Quantum Dots. https://arxiv.org/abs/2608.02388

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