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arXiv 2004.04268quant-phhep-phphysics.optics
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用定制的laser光束增强量子真空特征

Enhancing quantum vacuum signatures with tailored laser beams

Felix Karbstein, Elena A. Mosman

备注：
5 pages, 3 figures; presentation improved, matches PRD version
发表信息：
Phys. Rev. D 101, 113002 (2020)
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摘要：

我们证明，定制的激光束提供了一个强大的手段，使强电磁场中的量子真空签名在实验中可访问。在高强度前沿探测量子真空非线性的典型方案设想聚焦激光脉冲的碰撞。由真空涨落介导的驱动场的有效相互作用产生了编码量子真空非线性签名的信号光子。从驱动激光光子的大背景中分离出少量的信号光子是一个重大的实验挑战。本工作的主要思想是修改驱动激光束的远场特性，以在其中心呈现无场孔，从而允许在正向方向上散射的信号的基本上无背景的测量。我们的显式构造利用了一种特殊的远场/焦点对偶。

英文摘要：

We demonstrate that tailored laser beams provide a powerful means to make quantum vacuum signatures in strong electromagnetic fields accessible in experiment. Typical scenarios aiming at the detection of quantum vacuum nonlinearities at the high-intensity frontier envision the collision of focused laser pulses. The effective interaction of the driving fields mediated by vacuum fluctuations gives rise to signal photons encoding the signature of quantum vacuum nonlinearity. Isolating a small number of signal photons from the large background of the driving laser photons poses a major experimental challenge. The main idea of the present work is to modify the far-field properties of a driving laser beam to exhibit a field-free hole in its center, thereby allowing for an essentially background free measurement of the signal scattered in the forward direction. Our explicit construction makes use of a peculiar far-field/focus duality.

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