Waveguide Excitation and Spin Pumping of Chirally Coupled Quantum Dots
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arXiv
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| Auteurs principaux: | , , , , , , , , , |
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| Format: | Preprint |
| Publié: |
2025
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| _version_ | 1866915560715976704 |
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| author | Germanis, Savvas Chen, Xuchao Dost, René Hallett, Dominic J. Clarke, Edmund Patil, Pallavi K. Skolnick, Maurice S. Wilson, Luke R. Siampour, Hamidreza Fox, A. Mark |
| author_facet | Germanis, Savvas Chen, Xuchao Dost, René Hallett, Dominic J. Clarke, Edmund Patil, Pallavi K. Skolnick, Maurice S. Wilson, Luke R. Siampour, Hamidreza Fox, A. Mark |
| contents | We report on an integrated semiconductor chip where a single quantum dot (QD) is excited in-plane via a photonic-crystal waveguide through its nearest p-shell optical transition. The chirality of the waveguide mode is exploited to achieve both directional absorption and directional emission, resulting in a substantial enhancement in directional contrast, as measured for the Zeeman components of the waveguide-coupled QD. This remote excitation scheme enables high directionality (greater than or equal to 0.95) across approximately 56% of the waveguide area, with significant overlap with the Purcell-enhanced region, where the electric field intensity profile is near its peak. In contrast, local excitation methods using an out-of-plane excitation beam focused directly over the area of the QD achieve only approximately 25% overlap. This enhancement increases the likelihood of locating Purcell-enhanced QDs in regions that support high directionality, enabling the experimental demonstration of a six-fold enhancement in the decay rate of a QD with greater than 90% directionality. The remote p-shell excitation protocol establishes a new benchmark for waveguide quantum optics in terms of the combination of Purcell enhancement and high directionality, thereby paving the way for on-chip excitation of spin-based solid-state quantum technologies in regimes of high beta-factor. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2502_00218 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Waveguide Excitation and Spin Pumping of Chirally Coupled Quantum Dots Germanis, Savvas Chen, Xuchao Dost, René Hallett, Dominic J. Clarke, Edmund Patil, Pallavi K. Skolnick, Maurice S. Wilson, Luke R. Siampour, Hamidreza Fox, A. Mark Mesoscale and Nanoscale Physics Applied Physics Optics Quantum Physics We report on an integrated semiconductor chip where a single quantum dot (QD) is excited in-plane via a photonic-crystal waveguide through its nearest p-shell optical transition. The chirality of the waveguide mode is exploited to achieve both directional absorption and directional emission, resulting in a substantial enhancement in directional contrast, as measured for the Zeeman components of the waveguide-coupled QD. This remote excitation scheme enables high directionality (greater than or equal to 0.95) across approximately 56% of the waveguide area, with significant overlap with the Purcell-enhanced region, where the electric field intensity profile is near its peak. In contrast, local excitation methods using an out-of-plane excitation beam focused directly over the area of the QD achieve only approximately 25% overlap. This enhancement increases the likelihood of locating Purcell-enhanced QDs in regions that support high directionality, enabling the experimental demonstration of a six-fold enhancement in the decay rate of a QD with greater than 90% directionality. The remote p-shell excitation protocol establishes a new benchmark for waveguide quantum optics in terms of the combination of Purcell enhancement and high directionality, thereby paving the way for on-chip excitation of spin-based solid-state quantum technologies in regimes of high beta-factor. |
| title | Waveguide Excitation and Spin Pumping of Chirally Coupled Quantum Dots |
| topic | Mesoscale and Nanoscale Physics Applied Physics Optics Quantum Physics |
| url | https://arxiv.org/abs/2502.00218 |