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arXiv quant-ph/0507142quant-ph
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光的横向空间量子态的单光子测量

Measurement of the transverse spatial quantum state of light at the single-photon level

Brian J. Smith, Bryan Killett, M. G. Raymer, I. A. Walmsley, K. Banaszek

摘要:

提出了一种在单光子水平上测量坐标空间光场横向空间量子态的实验方法。连续变量的测量与光子计数,宇称反转Sagnac干涉仪的基础上全反射光学。该技术提供了一个大的数值孔径,而不扭曲的波前的形状,不引入像散,并允许在单光子水平的完全或部分相干光场的表征。测量了高衰减相干光束的横向空间维格纳函数,并与理论预测进行了比较。

英文摘要:

We present an experimental method to measure the transverse spatial quantum state of an optical field in coordinate space at the single-photon level. The continuous-variable measurements are made with a photon-counting, parity-inverting Sagnac interferometer based on all-reflecting optics. The technique provides a large numerical aperture without distorting the shape of the wave front, does not introduce astigmatism, and allows for characterization of fully or partially coherent optical fields at the single-photon level. Measurements of the transverse spatial Wigner functions for highly attenuated coherent beams are presented and compared to theoretical predictions.

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