光子局域化障碍可以克服
Photon localization barrier can be overcome
摘要：
与普遍认为光子的空间局部化受光子能量密度的幂律衰减限制的观点相反，I.Bialynicki-Birula [Phys. Rev. Lett. 80，5247（1998）]已经证明，任何更强的--直到几乎指数的--衰减都是允许的。我们表明，对于某些特别设计的圆柱形单光子状态的本地化是更好的横向方向。如果光子态是从所谓的聚焦波模式建立的，则腰部横截面平面中的衰减是二次指数（高斯）的，并且这种强局域化在传播过程中持续存在。
英文摘要：
In contradistinction to a widespread belief that the spatial localization of photons is restricted by a power-law falloff of the photon energy density, I.Bialynicki-Birula [Phys. Rev. Lett. 80, 5247 (1998)] has proved that any stronger -- up to an almost exponential -- falloff is allowed. We are showing that for certain specifically designed cylindrical one-photon states the localization is even better in lateral directions. If the photon state is built from the so-called focus wave mode, the falloff in the waist cross-section plane turns out to be quadratically exponential (Gaussian) and such strong localization persists in the course of propagation.
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