State detection using coherent Raman repumping and two-color Raman transfers
| Autor: | Nicholas C. Lewty, Murray D. Barrett, Boon Leng Chuah |
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| Rok vydání: | 2011 |
| Předmět: | |
| Zdroj: | Physical Review A. 84 |
| ISSN: | 1094-1622 1050-2947 |
| DOI: | 10.1103/physreva.84.013411 |
| Popis: | We demonstrate state detection based on coherent Raman repumping and a two-color Raman state transfer. The Raman coupling during detection selectively eliminates unwanted dark states in the fluorescence cycle without compromising the immunity of the desired dark state to off-resonant scattering. We demonstrate this technique using $^{137}\mathrm{Ba}^+$ where a combination of Raman coupling and optical pumping leaves the $D_{3/2}$ $\ket{F"=3,m_F"=3}$ metastable state optically dark and immune to off-resonant scattering. All other states are strongly coupled to the upper $P_{1/2}$ levels. We achieve a single shot state-detection efficiency of $89.6(3)%$ in a $1\mathrm{ms}$ integration time, limited almost entirely by technical imperfections. Shelving to the $\ket{F"=3,m_F"=3}$ state before detection is performed via a two-color Raman transfer with a fidelity of $1.00(3)$. |
| Databáze: | OpenAIRE |
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