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We experimentally establish a non-classical correlation between a single Stokes photon and the collective spin excited state of a cold atomic ensemble by using a spontaneous Raman scattering process. The correlation between them can be proved by transferring the spin excited state of the atomic ensemble into an anti-Stokes photon and checking the Cauchy-Schwarz inequality between the Stokes and the anti-Stokes photons. The non-classical correlation can be kept for at least 300 ns. 相似文献
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Frequency up-conversion is an effective method of mid-infrared (MIR) detection by converting long-wavelength photons to the visible domain, where efficient detectors are readily available. Here, we generate MIR light carrying orbital angular momentum (OAM) from a difference frequency generation process and perform up-conversion on it via sum frequency conversion in a bulk quasi-phase-matching crystal. The maximum quantum conversion efficiencies from MIR to visible are 34.0%, 10.4%, and 3.5% for light with topological charges of 0, 1, and 2, respectively, achieved by utilizing an optimized strong pump light. We also verify the OAM conservation with a specially designed interferometer, and the results agree well with the numerical simulations. Our study opens up the possibilities for generating, manipulating, and detecting MIR light that carries OAM, and will have great potential for optical communications and remote sensing in the MIR regime. 相似文献
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传统的红外探测主要基于铟镓砷、锑镉汞等半导体光子型探测器,然而这类探测器在常温下具有灵敏度低和噪声较大的缺点,高灵敏探测还需要深制冷,相对于成熟的硅探测器性能差距非常大。因此,将不易探测的红外波段转迁移至硅探测器的工作波段,并且利用高性能的硅基探测器进行有效探测是一种可行的路径。基于这种思想,目前发展了一种有效的频谱迁移探测方法,即通过非线性和频上转换过程将红外光子的频谱迁移到硅探测器的探测波段,从而实现高效的探测。文中系统介绍了基于频谱迁移红外探测的基本原理、主要参数和最新研究进展,最后对潜在的研究趋势和应用前景进行了展望。 相似文献
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Generation of a Non-Classical Correlated Photon Pair via Spontaneous Four-Wave Mixing in a Cold Atomic Ensemble 下载免费PDF全文
Counter propagated write and read lasers can be used to generate non-classical correlated photon pairs in an atomic ensemble. We experimentally investigate how the detuning of the write laser affects the non-classical correlation function between the Stokes photon and the anti-Stokes photon, which are generated via a spontaneous four-wave mixing process using an off-axis configuration in a cold 85 Rb atomic ensemble. The change of the time-resolved second-order correlated function between the Stokes and anti-Stokes photons is presented. The experimental result suggests that a suitable choice of detuning should be considered in such an experiment. 相似文献
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