Initialization of Neutral and Charged Exciton Spin States in a Telecom-Emitting Quantum Dot
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| Main Authors: | , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866908787217006592 |
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| author | Peniakov, Giora Michl, Johannes Helal, Mohamed Joos, Raphael Jetter, Michael Portalupi, Simone L. Michler, Peter Höfling, Sven Huber-Loyola, Tobias |
| author_facet | Peniakov, Giora Michl, Johannes Helal, Mohamed Joos, Raphael Jetter, Michael Portalupi, Simone L. Michler, Peter Höfling, Sven Huber-Loyola, Tobias |
| contents | Photonic cluster states are highly entangled states that allow for photonic quantum computing and memory-less quantum repeaters. Their generation has been recently demonstrated using semiconductor quantum dots emitting at the 900 nm wavelength range. However, a similar demonstration at the communication-optimal telecom range has remained elusive. A key ingredient that is still missing is an appropriate optical excitation method. A central requirement of such a method is to allow an arbitrary spin initialization of quantum dot excitonic complexes. In this work, we report on developing such a method based on a quasi-resonant p-shell excitation for a telecom-C-band-emitting quantum dot. We show qubit writing of a neutral exciton and spin-preserving excitation of a negative trion. Using the Larmor precession of the negative trion under an externally applied magnetic field, we determine the in-plane g-factors of both the electron and the hole in the investigated quantum dot. In addition, we measure a lower bound on the hole coherence time, $T_{2}^{*}>6.4$ ns, boosting its candidacy as a sound photon entangler for more advanced quantum photonic schemes. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2504_20497 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Initialization of Neutral and Charged Exciton Spin States in a Telecom-Emitting Quantum Dot Peniakov, Giora Michl, Johannes Helal, Mohamed Joos, Raphael Jetter, Michael Portalupi, Simone L. Michler, Peter Höfling, Sven Huber-Loyola, Tobias Quantum Physics Mesoscale and Nanoscale Physics Photonic cluster states are highly entangled states that allow for photonic quantum computing and memory-less quantum repeaters. Their generation has been recently demonstrated using semiconductor quantum dots emitting at the 900 nm wavelength range. However, a similar demonstration at the communication-optimal telecom range has remained elusive. A key ingredient that is still missing is an appropriate optical excitation method. A central requirement of such a method is to allow an arbitrary spin initialization of quantum dot excitonic complexes. In this work, we report on developing such a method based on a quasi-resonant p-shell excitation for a telecom-C-band-emitting quantum dot. We show qubit writing of a neutral exciton and spin-preserving excitation of a negative trion. Using the Larmor precession of the negative trion under an externally applied magnetic field, we determine the in-plane g-factors of both the electron and the hole in the investigated quantum dot. In addition, we measure a lower bound on the hole coherence time, $T_{2}^{*}>6.4$ ns, boosting its candidacy as a sound photon entangler for more advanced quantum photonic schemes. |
| title | Initialization of Neutral and Charged Exciton Spin States in a Telecom-Emitting Quantum Dot |
| topic | Quantum Physics Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2504.20497 |