Deterministic nanofabrication for engineering nanowire quantum dot devices
Abstract
Semiconductor quantum dots (QDs) are a leading platform for realising bright, wavelength-tunable sources of single and entangled photon pairs for photonic quantum technologies. Site-selected nanowire quantum dots (NWQDs) are a promising platform for fabricating such photonic devices in a scalable manner. However, implementing additional structures around the photonic nanowire while maintaining its vertical growth geometry has remained a challenge. In this work, we develop a deterministic pick-and-place technique to conduct a vertical-to-vertical transfer of NWQDs from the growth substrate to arbitrary templates. Using this transfer technique, we enhance the photon extraction efficiency to 75% by implementing a bottom gold mirror and tune the emission wavelength by 3.6 GHz via implementing electrostatic gates around the QD. Importantly, we measure low-multiphoton probability (g^(2)(0) = 0.002) and high indistinguishability (>80% for +/-100 ps) of the QD emission after the transfer process, yielding high-quality devices. These results demonstrate the repeatability and versatility of the developed transfer technique, which is an enabling step towards scalable single and entangled photon sources.
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BibTeX
@misc{patel2026deterministic,
title = {{Deterministic nanofabrication for engineering nanowire quantum dot devices}},
author = {Tarun Patel and Matteo Pennacchietti and Greg Holloway and Stephen R. Harrigan and Sayan Gangopadhyay and Anthony Drouin and Megha Jain and Dan Dalacu and Philip J. Poole and Sasan Vosoogh-Grayli and Michael E. Reimer},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.03076},
eprint = {2609.03076},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.03076},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Deterministic nanofabrication for engineering nanowire quantum dot devices
AU - Tarun Patel
AU - Matteo Pennacchietti
AU - Greg Holloway
AU - Stephen R. Harrigan
AU - Sayan Gangopadhyay
AU - Anthony Drouin
AU - Megha Jain
AU - Dan Dalacu
AU - Philip J. Poole
AU - Sasan Vosoogh-Grayli
AU - Michael E. Reimer
PY - 2026
DA - 2026/09/02
PB - arXiv
DO - 10.48550/arxiv.2609.03076
UR - https://arxiv.org/abs/2609.03076
AB - Semiconductor quantum dots (QDs) are a leading platform for realising bright, wavelength-tunable sources of single and entangled photon pairs for photonic quantum technologies. Site-selected nanowire quantum dots (NWQDs) are a promising platform for fabricating such photonic devices in a scalable manner. However, implementing additional structures around the photonic nanowire while maintaining its vertical growth geometry has remained a challenge. In this work, we develop a deterministic pick-and-place technique to conduct a vertical-to-vertical transfer of NWQDs from the growth substrate to arbitrary templates. Using this transfer technique, we enhance the photon extraction efficiency to 75% by implementing a bottom gold mirror and tune the emission wavelength by 3.6 GHz via implementing electrostatic gates around the QD. Importantly, we measure low-multiphoton probability (g^(2)(0) = 0.002) and high indistinguishability (>80% for +/-100 ps) of the QD emission after the transfer process, yielding high-quality devices. These results demonstrate the repeatability and versatility of the developed transfer technique, which is an enabling step towards scalable single and entangled photon sources.
ER -