Near Transform-Limited Quantum Dot Linewidths in a Broadband Photonic Crystal Waveguide

Pedersen, Freja T. and Wang, Ying and Olesen, Cecilie T. and Scholz, Sven and Wieck, Andreas D. and Ludwig, Arne and LObl, Matthias C. and Warburton, Richard J. and Midolo, Leonardo and Uppu, Ravitej and Lodahl, Peter. (2020) Near Transform-Limited Quantum Dot Linewidths in a Broadband Photonic Crystal Waveguide. ACS Photonics, 7 (9). pp. 2343-2349.

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Planar nanophotonic structures enable broadband, near-unity coupling of emission from quantum dots embeddedwithin, thereby realizing ideal singe-photon sources. The efficiency and coherence of the single-photon source islimited by charge noise, which results in the broadening of the emission spectrum. We report suppression of the noiseby fabricating photonic crystal waveguides in a gallium arsenide membrane containing quantum dots embedded in ap-i-ndiode. Local electrical contacts in the vicinity of the waveguides minimize the leakage current and allow fastelectrical control (≈4 MHz bandwidth) of the quantum dot resonances. Resonant linewidth measurements of 79 quan-tum dots coupled to the photonic crystal waveguides exhibit near transform-limited emission over a 6 nm wide range ofemission wavelengths. Importantly, the local electrical contacts allow independent tuning of multiple quantum dots onthe same chip, which together with the transform-limited emission are key components in realizing multiemitter-basedquantum information processing.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Experimental Physics (Warburton)
UniBasel Contributors:Warburton, Richard J
Item Type:Article, refereed
Article Subtype:Research Article
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:07 Apr 2021 13:30
Deposited On:07 Apr 2021 13:29

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