Optical pumping and initialization of a hole spin in site-controlled InGaAs pyramidal quantum dots
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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866908523412062208 |
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| author | Barcan, R. A. Samaras, I. Barr, K. Juska, G. Pelucchi, E. Lagoudakis, K. G. |
| author_facet | Barcan, R. A. Samaras, I. Barr, K. Juska, G. Pelucchi, E. Lagoudakis, K. G. |
| contents | We investigate site-controlled In$_{0.25}$Ga$_{0.75}$As quantum dots in (111)B GaAs pyramidal recesses as spin qubits. Combining scanning confocal cryomicroscopy, magneto-photoluminescence studies and resonant excitation, we identify and isolate a positively charged exciton with a hole-spin in its ground state. Application of a strong 5 T magnetic field parallel to the growth axis, induces a fourfold splitting of the energy levels of the positively charged exciton creating an optically addressable double-lambda system. We combine weak above-band and resonant excitation to demonstrate spin pumping and high-fidelity spin initialization through all four optical transitions and study the system behavior as a function of the resonant driving strength showing the existence of a robust spin that can be optically pumped and initialized. These results demonstrate the potential of these quantum dots for precise spin manipulation and their relevance for future quantum hardware. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2503_05400 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Optical pumping and initialization of a hole spin in site-controlled InGaAs pyramidal quantum dots Barcan, R. A. Samaras, I. Barr, K. Juska, G. Pelucchi, E. Lagoudakis, K. G. Mesoscale and Nanoscale Physics Other Condensed Matter We investigate site-controlled In$_{0.25}$Ga$_{0.75}$As quantum dots in (111)B GaAs pyramidal recesses as spin qubits. Combining scanning confocal cryomicroscopy, magneto-photoluminescence studies and resonant excitation, we identify and isolate a positively charged exciton with a hole-spin in its ground state. Application of a strong 5 T magnetic field parallel to the growth axis, induces a fourfold splitting of the energy levels of the positively charged exciton creating an optically addressable double-lambda system. We combine weak above-band and resonant excitation to demonstrate spin pumping and high-fidelity spin initialization through all four optical transitions and study the system behavior as a function of the resonant driving strength showing the existence of a robust spin that can be optically pumped and initialized. These results demonstrate the potential of these quantum dots for precise spin manipulation and their relevance for future quantum hardware. |
| title | Optical pumping and initialization of a hole spin in site-controlled InGaAs pyramidal quantum dots |
| topic | Mesoscale and Nanoscale Physics Other Condensed Matter |
| url | https://arxiv.org/abs/2503.05400 |