Fabrication and optical characterization of photonic crystal nanocavities with electrodes for gate-defined quantum dots

Tajiri, T. and Sakai, Y. and Kuruma, K. and Ji, S.M. and Kiyama, H. and Oiwa, A. and Ritzmann, J. and Ludwig, Ar. and Wieck, A.D. and Ota, Y. and Arakawa, Y. and Iwamoto, S.

Volume: 59 Pages:
DOI: 10.7567/1347-4065/ab5b62
Published: 2020

Among various solid-state systems, gate-defined quantum dots (QD) with high scalability and controllability for single electron spin qubits are promising candidates to realize quantum spin-photon interface. The efficiency of the spin-photon interface is expected to be significantly enhanced by optical coupling of gate-defined QDs with photonic crystal (PhC) nanocavities. As the first step towards this optical coupling, we designed and experimentally demonstrated a PhC nanocavity with electrodes. The electrodes, which can form a single QD, were introduced on the top surfaces of two-dimensional PhC nanocavities with a position accuracy of a few tens of nanometers. Despite the electrodes, a resonant mode was confirmed for the PhC nanocavities through micro-photoluminescence spectroscopy. This work marks a crucial step towards optical coupling between gate-defined QDs and PhC nanocavities. © 2020 The Japan Society of Applied Physics.

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