热种子参量下转换中的量子-经典跃迁
The quantum-classical transition in thermally seeded parametric downconversion
摘要：
我们解决了从参数下转换得到的一对共轭场模作为一个方便的系统来分析连续变量制度中的量子经典跃迁。我们明确评估强度相关性，负性和纠缠的系统在热状态，并表明，一个层次的非经典阈值自然出现在热和下转换光子数。我们表明，从量子到经典制度的过渡可以通过控制种子的强度和强度测量检测调谐。此外，我们表明，阈值不受损失的影响，这只是修改量的非经典。多模的情况下，也进行了一些详细的分析。
英文摘要：
We address the pair of conjugated field modes obtained from parametric-downconversion as a convenient system to analyze the quantum-classical transition in the continuous variable regime. We explicitly evaluate intensity correlations, negativity and entanglement for the system in a thermal state and show that a hierarchy of nonclassicality thresholds naturally emerges in terms of thermal and downconversion photon number. We show that the transition from quantum to classical regime may be tuned by controlling the intensities of the seeds and detected by intensity measurements. Besides, we show that the thresholds are not affected by losses, which only modify the amount of nonclassicality. The multimode case is also analyzed in some detail.
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