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arXiv 1406.6489quant-ph
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室温拉曼原子存储器读出中的哈密顿量设计

Hamiltonian design in readout from room-temperature Raman atomic memory

Michał Dąbrowski, Radosław Chrapkiewicz, Wojciech Wasilewski

摘要:

本文介绍了在喇曼型铷-87蒸气温原子存储器中,光-原子界面哈密顿量操纵的实验结果。通过调节驱动光束的失谐量,我们改变了斯托克斯和反斯托克斯散射对四波混频过程的相对贡献,从而读出了原子存储器的空间多模态。我们测量了读出场的时间演化和写入和读出之间的空间强度相关性作为失谐的函数,使用增强相机。相关图使我们能够解决反斯托克斯散射和斯托克斯散射之间的关系,并量化它们的贡献。我们的实验结果同意定量与一个简单的,平面波的理论模型,我们提供。他们允许一个简单的解释的反斯托克斯和斯托克斯散射在读出阶段的共同作用。斯托克斯贡献在读出阶段产生额外的可调增益,尽管不可避免地有额外的噪声。在这里,我们提供了一个简单而有用的框架来跟踪它,这对现有的原子内存设置很有意义。此外,所示的哈密顿操纵提供了广泛的原子-光接口,易于应用于当前和未来的量子协议与原子系综。

英文摘要:

We present an experimental demonstration of the Hamiltonian manipulation in light-atom interface in Raman-type warm rubidium-87 vapor atomic memory. By adjusting the detuning of the driving beam we varied the relative contributions of the Stokes and anti-Stokes scattering to the process of four-wave mixing which reads out a spatially multimode state of atomic memory. We measured the temporal evolution of the readout fields and the spatial intensity correlations between write-in and readout as a function of detuning with the use of an intensified camera. The correlation maps enabled us to resolve between the anti-Stokes and the Stokes scattering and to quantify their contributions. Our experimental results agree quantitatively with a simple, plane-wave theoretical model we provide. They allow for a simple interpretation of the coaction of the anti-Stokes and the Stokes scattering at the readout stage. The Stokes contribution yields additional, adjustable gain at the readout stage, albeit with inevitable extra noise. Here we provide a simple and useful framework to trace it, which is significant to the existing atomic memories setups. Furthermore, the shown Hamiltonian manipulation offers a broad range of atom-light interfaces readily applicable in current and future quantum protocols with atomic ensembles.

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