On-chip coherent conversion of photonic quantum entanglement between different degrees of freedom.
On-chip coherent conversion of photonic quantum entanglement between different degrees of freedom.
复制标题
不同自由度之间光子量子纠缠的片上相干转换
DOI：
10.1038/ncomms11985
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发表时间：
2016-06-20
影响因子：
16.6
通讯作者：
Guo GC
中科院分区：
文献类型：
--
作者：
Feng LT;Zhang M;Zhou ZY;Li M;Xiong X;Yu L;Shi BS;Guo GP;Dai DX;Ren XF;Guo GC
在量子世界中，单个粒子可以有不同的自由度来编码量子信息。同时控制多个自由度对于完整地描述粒子是必要的，因此可以更有效地使用它。本文将横波导模自由度引入到量子光子集成电路中，并在单芯片上实现了光量子态在路径、偏振和横波导模自由度之间的相干转换。通过使用光纤分束器或片上分束器的单光子和双光子量子干涉证明了在这些转换过程中量子相干性的保持。这些结果为基于量子光子集成电路的量子信息处理提供了控制和转换多自由度光子的能力。
In the quantum world, a single particle can have various degrees of freedom to encode quantum information. Controlling multiple degrees of freedom simultaneously is necessary to describe a particle fully and, therefore, to use it more efficiently. Here we introduce the transverse waveguide-mode degree of freedom to quantum photonic integrated circuits, and demonstrate the coherent conversion of a photonic quantum state between path, polarization and transverse waveguide-mode degrees of freedom on a single chip. The preservation of quantum coherence in these conversion processes is proven by single-photon and two-photon quantum interference using a fibre beam splitter or on-chip beam splitters. These results provide us with the ability to control and convert multiple degrees of freedom of photons for quantum photonic integrated circuit-based quantum information process.