Passive Demultiplexed Two-photon State Generation from a Quantum Dot
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arXiv
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| Main Authors: | , , , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866917931126882304 |
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| author | Karli, Yusuf Arenas, Iker Avila Schimpf, Christian Junior, Ailton José Garcia Manna, Santanu Kappe, Florian Schwarz, René Undeutsch, Gabriel Aigner, Maximilian Peter, Melina da Silva, Saimon F Covre Rastelli, Armando Weihs, Gregor Remesh, Vikas |
| author_facet | Karli, Yusuf Arenas, Iker Avila Schimpf, Christian Junior, Ailton José Garcia Manna, Santanu Kappe, Florian Schwarz, René Undeutsch, Gabriel Aigner, Maximilian Peter, Melina da Silva, Saimon F Covre Rastelli, Armando Weihs, Gregor Remesh, Vikas |
| contents | High-purity multi-photon states are essential for photonic quantum computing. Among existing platforms, semiconductor quantum dots offer a promising route to scalable and deterministic multi-photon state generation. However, to fully realize their potential we require a suitable optical excitation method. Current approaches of multi-photon generation rely on active polarization-switching elements (e.g., electro-optic modulators, EOMs) to spatio-temporally demultiplex single photons. Yet, the achievable multi-photon rate is fundamentally limited by the switching speed of the EOM. Here, we introduce a fully passive demultiplexing technique that leverages a stimulated two-photon excitation process to achieve switching rates that are only limited by the quantum dot lifetime. We demonstrate this method by generating two-photon states from a single quantum dot without requiring any active switching elements. Our approach significantly reduces the cost of demultiplexing while shifting it to the excitation stage, enabling loss-free demultiplexing and effectively doubling the achievable multi-photon generation rate when combined with existing active demultiplexing techniques. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2502_14806 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Passive Demultiplexed Two-photon State Generation from a Quantum Dot Karli, Yusuf Arenas, Iker Avila Schimpf, Christian Junior, Ailton José Garcia Manna, Santanu Kappe, Florian Schwarz, René Undeutsch, Gabriel Aigner, Maximilian Peter, Melina da Silva, Saimon F Covre Rastelli, Armando Weihs, Gregor Remesh, Vikas Quantum Physics Mesoscale and Nanoscale Physics Optics High-purity multi-photon states are essential for photonic quantum computing. Among existing platforms, semiconductor quantum dots offer a promising route to scalable and deterministic multi-photon state generation. However, to fully realize their potential we require a suitable optical excitation method. Current approaches of multi-photon generation rely on active polarization-switching elements (e.g., electro-optic modulators, EOMs) to spatio-temporally demultiplex single photons. Yet, the achievable multi-photon rate is fundamentally limited by the switching speed of the EOM. Here, we introduce a fully passive demultiplexing technique that leverages a stimulated two-photon excitation process to achieve switching rates that are only limited by the quantum dot lifetime. We demonstrate this method by generating two-photon states from a single quantum dot without requiring any active switching elements. Our approach significantly reduces the cost of demultiplexing while shifting it to the excitation stage, enabling loss-free demultiplexing and effectively doubling the achievable multi-photon generation rate when combined with existing active demultiplexing techniques. |
| title | Passive Demultiplexed Two-photon State Generation from a Quantum Dot |
| topic | Quantum Physics Mesoscale and Nanoscale Physics Optics |
| url | https://arxiv.org/abs/2502.14806 |