The impact of hole $g$-factor anisotropy on spin-photon entanglement generation with InGaAs quantum dots
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| Autores principales: | , , , , , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| _version_ | 1866912550606602240 |
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| author | Ramesh, P. R. Annoni, E. Margaria, N. Fioretto, D. A. Pishchagin, A. Morassi, M. Lemaître, A. Doty, M. F. Senellart, P. Lanco, L. Belabas, N. Wein, S. C. Krebs, O. |
| author_facet | Ramesh, P. R. Annoni, E. Margaria, N. Fioretto, D. A. Pishchagin, A. Morassi, M. Lemaître, A. Doty, M. F. Senellart, P. Lanco, L. Belabas, N. Wein, S. C. Krebs, O. |
| contents | Self-assembled InGaAs/GaAs quantum dots (QDs) are of particular importance for the deterministic generation of spin-photon entanglement. One promising scheme relies on the Larmor precession of a spin in a transverse magnetic field, which is governed by the in-plane $g$-factors of the electron and valence band heavy-hole. We probe the origin of heavy-hole $g$-factor anisotropy with respect to the in-plane magnetic field direction and uncover how it impacts the entanglement generated between the spin and the photon polarization. First, using polarization-resolved photoluminescence measurements on a single QD, we determine that the impact of valence-band mixing dominates over effects due to a confinement-renormalized cubic Luttinger $q$ parameter. From this, we construct a comprehensive hole $g$-tensor model. We then use this model to simulate the concurrence and fidelity of spin-photon entanglement generation with anisotropic hole $g$-factors, which can be tuned via magnetic field angle and excitation polarization. The results demonstrate that post-growth control of the hole $g$-factor can be used to improve spin-photon cluster state generation. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2502_07627 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | The impact of hole $g$-factor anisotropy on spin-photon entanglement generation with InGaAs quantum dots Ramesh, P. R. Annoni, E. Margaria, N. Fioretto, D. A. Pishchagin, A. Morassi, M. Lemaître, A. Doty, M. F. Senellart, P. Lanco, L. Belabas, N. Wein, S. C. Krebs, O. Mesoscale and Nanoscale Physics Quantum Physics Self-assembled InGaAs/GaAs quantum dots (QDs) are of particular importance for the deterministic generation of spin-photon entanglement. One promising scheme relies on the Larmor precession of a spin in a transverse magnetic field, which is governed by the in-plane $g$-factors of the electron and valence band heavy-hole. We probe the origin of heavy-hole $g$-factor anisotropy with respect to the in-plane magnetic field direction and uncover how it impacts the entanglement generated between the spin and the photon polarization. First, using polarization-resolved photoluminescence measurements on a single QD, we determine that the impact of valence-band mixing dominates over effects due to a confinement-renormalized cubic Luttinger $q$ parameter. From this, we construct a comprehensive hole $g$-tensor model. We then use this model to simulate the concurrence and fidelity of spin-photon entanglement generation with anisotropic hole $g$-factors, which can be tuned via magnetic field angle and excitation polarization. The results demonstrate that post-growth control of the hole $g$-factor can be used to improve spin-photon cluster state generation. |
| title | The impact of hole $g$-factor anisotropy on spin-photon entanglement generation with InGaAs quantum dots |
| topic | Mesoscale and Nanoscale Physics Quantum Physics |
| url | https://arxiv.org/abs/2502.07627 |