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首页> 外文会议>SPIE Conference on Advances in Photonics of Quantum Computing, Memory, and Communication >Optimal detuning for writing warm-atomic-vapor quantum memory in the presence of collisional fluorescence and four-wave mixing
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Optimal detuning for writing warm-atomic-vapor quantum memory in the presence of collisional fluorescence and four-wave mixing

机译：在碰撞荧光和四波混合存在下写入暖 - 原子蒸气量子记忆的最佳失真

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摘要

Atomic vapor cells with buffer gas have a number of advantages when employed as quantum memory blocks based on the DLCZ (Duan-Lukin-Cirac-Zoller) protocol: operation slightly above room temperature, ease of handling, as well as commercial availability. Nevertheless, the signal-to-noise ratio in the current implementations is severely limited by the simultaneous presence of collisional fluorescence and the four-wave mixing noise. In our previous work, we have shown how to minimize the influence of the former on the writing process and provided an unambiguous demonstration of quantum memory lasting for 4 μs. An elegant approach to suppress the four-wave-mixing noise by pre-pumping to the state with the hyperfine sublevel with the maximum value was proposed by Walther et al., Int. J. Quantum Inform. 5, 51 (2007). Here we show that this approach is fundamentally limited by the cancellation of the Raman matrix elements involving the Fˊ= 1 and Fˊ= 2 levels, which occurs for all experimental conditions in the S → P transitions of all alkali atoms. A detuning that maximizes the signal-to-noise ratio is shown to exist for a given detector dark-count rate.
机译：当基于DLCZ（Duan-Lukin-Cirac-Zoller）协议的量子存储器块时，具有缓冲气体的原子蒸汽细胞具有许多优点：操作略高于室温，易于处理以及商业可用性。然而，当前实施方式中的信噪比受到碰撞荧光的同时存在和四波混合噪声的严重限制。在我们以前的工作中，我们已经表明了如何最大限度地减少前者对写作过程的影响，并提供了持续4μs的量子记忆的明确演示。通过预先泵送到具有最大值的具有最大值的高浓度浮出水，抑制四波混合噪声的优雅方法是由Walther等，int。，int。 J.量子通知。 5,51（2007）。在这里，我们表明该方法基本上受到涉及F'= 1和F'= 2水平的拉曼基质元素的基本限制，这发生了所有碱原子的S→P转变中的所有实验条件。在给定的探测器暗计数率下显示最大化信噪比的失谐。

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