Versatile and precise quantum state engineering by using nonlinear interferometers
Versatile and precise quantum state engineering by using nonlinear interferometers
复制标题
使用非线性干涉仪进行多功能且精确的量子态工程
DOI：
10.1364/oe.27.020479
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发表时间：
2019-07-22
期刊：
影响因子：
3.8
通讯作者：
Ou, Z. Y.
中科院分区：
文献类型：
--
作者：
Su, Jie;Cui, Liang;Ou, Z. Y.
具有明确时间模式的光子态的可用性对于光子量子技术至关重要。自从通过脉冲泵浦自发参数过程产生光子量子态以来，人们在提高光子态的模态纯度以实现单模操作方面付出了许多努力。然而，由于非线性相互作用和线性色散经常混合在参数过程中，因此迄今为止仅在某些特定波长上通过复杂的设计取得了有限的成功。在本文中，我们采用了一种不同的方法，利用源自非线性干涉仪干涉条纹的有源滤波机制。该非线性干涉仪实现在非线性介质的顺序阵列中，其间具有由线性色散介质构成的间隙，在不影响参数过程的相位匹配的情况下实现精确的模态控制。作为该功能的原理验证演示，我们提出了一个光子对源，该光子对源使用两级非线性干涉仪，该干涉仪由两根相同的非线性光纤组成，中间有一根标准单模光纤。结果表明，通过单片非线性光纤中的四波混频将光谱相关的双光子态修改为可因子态，并且可以获得具有高模态纯度和高预示效率的预示单光子。这种新颖的量子干涉方法可以在模式纯度、预示效率和波长选择灵活性等几乎所有方面提高光子态的质量，被证明是有效且易于实现的。 (C) 2019 年美国光学学会根据 OSA 开放获取出版协议条款
The availability of photon states with well-defined temporal modes is crucial for photonic quantum technologies. Ever since the inception of generating photonic quantum states through pulse pumped spontaneous parametric processes, many exquisite efforts have been put on improving the modal purity of the photon states to achieve single-mode operation. However, because the nonlinear interaction and linear dispersion are often mixed in parametric processes, limited successes have been achieved so far only at some specific wavelengths with sophisticated design. In this paper, we resort to a different approach by exploiting an active filtering mechanism originated from interference fringe of nonlinear interferometer. The nonlinear interferometer is realized in a sequential array of nonlinear medium, with a gap in between made of a linear dispersive medium, in which the precise modal control is realized without influencing the phase matching of the parametric process. As a proof-of-principle demonstration of the capability, we present a photon pairs source using a two-stage nonlinear interferometer formed by two identical nonlinear fibers with a standard single mode fiber in between. The results show that spectrally correlated two-photon state via four wave mixing in a single piece nonlinear fiber is modified into factorable state and heralded single-photons with high modal purity and high heralding efficiency are achievable. This novel quantum interferometric method, which can improve the quality of the photon states in almost all the aspects such as modal purity, heralding efficiency, and flexibility in wavelength selection, is proved to be effective and easy to realize. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement