Spatial mapping of quantum-dot dynamics across multiple timescales at low temperature using remote asynchronous optical sampling
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arXiv
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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866918426675511296 |
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| author | Asambo, Gen Shibata, Riku Takahashi, Yushiro Akahane, Kouichi Watanabe, Shinichi Ishi-Hayase, Junko |
| author_facet | Asambo, Gen Shibata, Riku Takahashi, Yushiro Akahane, Kouichi Watanabe, Shinichi Ishi-Hayase, Junko |
| contents | Quantum dots (QDs) offer significant potential for applications in quantum information and optoelectronic devices; however, conventional time-resolved spectroscopy cannot generally simultaneously extract both long-lived relaxation dynamics and short-lived quantum beats from ensemble measurements. This limitation arises from the inherent trade-off between temporal resolution and total acquisition time. Here, we demonstrate that asynchronous optical sampling based on a fiber-delivered frequency comb enables simultaneous observation of QD dynamics across multiple timescales. By integrating a galvanometric scanner, we achieve spatial mapping over a $1 \times 1$-\si{\milli\meter}$^2$ area at 441 discrete points in 30.1~min, a measurement that would otherwise require more than 12~days. At each location, both quantum beats and relaxation lifetimes are resolved, giving physical insights into QD ensembles that were previously inaccessible and paving the way for rapid feedback in device fabrication. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_03041 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Spatial mapping of quantum-dot dynamics across multiple timescales at low temperature using remote asynchronous optical sampling Asambo, Gen Shibata, Riku Takahashi, Yushiro Akahane, Kouichi Watanabe, Shinichi Ishi-Hayase, Junko Optics Quantum dots (QDs) offer significant potential for applications in quantum information and optoelectronic devices; however, conventional time-resolved spectroscopy cannot generally simultaneously extract both long-lived relaxation dynamics and short-lived quantum beats from ensemble measurements. This limitation arises from the inherent trade-off between temporal resolution and total acquisition time. Here, we demonstrate that asynchronous optical sampling based on a fiber-delivered frequency comb enables simultaneous observation of QD dynamics across multiple timescales. By integrating a galvanometric scanner, we achieve spatial mapping over a $1 \times 1$-\si{\milli\meter}$^2$ area at 441 discrete points in 30.1~min, a measurement that would otherwise require more than 12~days. At each location, both quantum beats and relaxation lifetimes are resolved, giving physical insights into QD ensembles that were previously inaccessible and paving the way for rapid feedback in device fabrication. |
| title | Spatial mapping of quantum-dot dynamics across multiple timescales at low temperature using remote asynchronous optical sampling |
| topic | Optics |
| url | https://arxiv.org/abs/2604.03041 |