Centre for Quantum Photonics, H. H. Wills Physics Laboratory and Department of Electrical and Electronic Engineering, University of Bristol, Merchant Venturers Building, Woodland Road, Bristol BS8 1UB, United Kingdom.
Institute of Applied Physics, Friedrich-Schiller-Universität Jena, Max-Wien-Platz 1, D-07743 Jena, Germany.
Phys Rev Lett. 2014 Apr 11;112(14):143604. doi: 10.1103/PhysRevLett.112.143604. Epub 2014 Apr 10.
We demonstrate quantum walks of correlated photons in a two-dimensional network of directly laser written waveguides coupled in a "swiss cross" arrangement. The correlated detection events show high-visibility quantum interference and unique composite behavior: strong correlation and independence of the quantum walkers, between and within the planes of the cross. Violations of a classically defined inequality, for photons injected in the same plane and in orthogonal planes, reveal nonclassical behavior in a nonplanar structure.
我们在一个由直接激光写入的波导组成的二维网络中演示了相关光子的量子漫步，这些波导以“瑞士十字”的形式耦合。相关的检测事件显示出高可见度的量子干涉和独特的复合行为：在十字交叉的平面之间和内部，量子漫步者之间存在强相关性和独立性。对于注入同一平面和正交平面的光子，违反一个经典定义的不等式表明，在非平面结构中存在非经典行为。
