Coherence Time Extension by Large Scale Optical Spin Polarization in a Rare-Earth Doped Crystal
| Autor: | Welinski, Sacha, Tiranov, Alexey, Businger, Moritz, Ferrier, Alban, Afzelius, Mikael, Goldner, Philippe |
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| Rok vydání: | 2019 |
| Předmět: | |
| Zdroj: | Phys. Rev. X 10, 031060 (2020) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevX.10.031060 |
| Popis: | Optically addressable spins are actively investigated in quantum communication, processing and sensing. Optical and spin coherence lifetimes, which determine quantum operation fidelity and storage time, are often limited by spin-spin interactions, which can be decreased by polarizing spins in their lower energy state using large magnetic fields and/or mK range temperatures. Here, we show that optical pumping of a small fraction of ions with a fixed frequency laser, coupled with spin-spin interactions and spin diffusion, leads to substantial spin polarization in a paramagnetic rare earth doped crystal, $^{171}$Yb$^{3+}$:YSO. Indeed, up to more than 90 % spin polarizations have been achieved at 2 K and zero magnetic field. Using this spin polarization mechanism, we furthermore demonstrate an increase in optical coherence lifetime from 0.3 ms to 0.8 ms, due to a strong decrease in spin-spin interactions. This effect opens the way to new schemes for obtaining long optical and spin coherence lifetimes in various solid-state systems such as ensembles of rare earth ions or color centers in diamond, which is of interest for a broad range of quantum technologies. Comment: 22 pages, 17 figures |
| Databáze: | arXiv |
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