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arXiv 1106.4607quant-phphysics.optics
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利用单个哈密顿量实现互补可观量的可行光学弱测量

Feasible optical weak measurements of complementary observables via a single Hamiltonian

Shengjun Wu, Marek Żukowski

摘要:

给出了一对互补观测量联合弱测量的一般形式。在非线性晶体中的光学三波混频的标准过程(例如在参量下转换中)适合于这样的任务。为了获得变量$A$的弱值,使用“米”场的不同初始状态执行两次弱测量。这似乎是一个缺点,但作为补偿,我们得到免费的互补变量$B$的弱值。该方案是可调的和通用的:一个人可以访问一个连续的一组可能的弱测量对可观的。该方案相对于没有后选择的情况提高了信噪比。

英文摘要:

A general formalism for joint weak measurements of a pair of complementary observables is given. The standard process of optical three-wave mixing in a nonlinear crystal (such as in parametric down-conversion) is suitable for such tasks. To obtain the weak value of a variable $A$ one performs weak measurements twice, with different initial states of the "meter" field. This seems to be a drawback, but as a compensation we get for free the weak value of a complementary variable $B$. The scheme is tunable and versatile: one has access to a continuous set of possible weak measurements of pair of observables. The scheme increases signal-to-noise ratio with respect to the case without postselection.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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