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首页> 外文会议>Advances in photonics of quantum computing, memory, and communication VI >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作用下写入热原子蒸气量子记忆的最佳失谐

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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 F' = 1 and F' = 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：当用作基于DLCZ（Duan-Lukin-Cirac-Zoller）协议的量子存储模块时，带有缓冲气体的原子蒸气电池具有许多优势：在室温以上工作，易于处理以及可商业获得。然而，当前实现中的信噪比受到碰撞荧光和四波混合噪声的同时存在的严重限制。在我们之前的工作中，我们展示了如何最大程度地减少前者对写入过程的影响，并提供了持续4μs的量子存储器的明确演示。 Walther等人（Int。1986）提出了一种优雅的方法，该方法通过将预抽到具有超精细子水平且具有最大值的状态来抑制四波混频噪声。 J.量子信息。 5，51（2007）。在这里，我们表明该方法从根本上受到涉及F'= 1和F'= 2水平的拉曼矩阵元素的抵消的限制，这种情况在所有实验条件下所有碱原子的S→P跃迁中均会发生。对于给定的检测器暗计数率，存在使信噪比最大的失谐。

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