一种新型单晶体单通源，用于产生偏振和颜色纠缠的光子对。

A novel single-crystal & single-pass source for polarisation- and colour-entangled photon pairs.

机构信息

Security & Communication Technologies, Center for Digital Safety & Security, AIT Austrian Institute of Technology GmbH, Donau-City-Str. 1, 1220, Vienna, Austria.

Quantum Optics, Quantum Nanophysics & Quantum Information, Faculty of Physics, University of Vienna, Boltzmanngasse 5, 1090, Vienna, Austria.

出版信息

Sci Rep. 2017 Aug 3;7(1):7235. doi: 10.1038/s41598-017-07781-w.

DOI:10.1038/s41598-017-07781-w

PMID:28775324

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5543183/

Abstract

We demonstrate a new generation mechanism for polarisation- and colour-entangled photon pairs. In our approach we tailor the phase-matching of a periodically poled KTP crystal such that two downconversion processes take place simultaneously. Relying on this effect, our source emits entangled bipartite photon states, emerging intrinsically from a single, unidirectionally pumped crystal with uniform poling period. Its property of being maximally compact and luminous at the same time makes our source unique compared to existing photon-entanglement sources and is therefore of high practical significance in quantum information experiments.

摘要

我们展示了一种新的极化和颜色纠缠光子对产生机制。在我们的方法中，我们调整了周期性极化 KTP 晶体的相位匹配，使得两个下转换过程同时发生。依靠这一效应，我们的源发射出纠缠的双粒子光子态，这些纠缠态本质上来自于一个具有均匀极化周期的单向泵浦晶体。与现有的光子纠缠源相比，它的最大紧凑性和发光性的特性使我们的源具有独特性，因此在量子信息实验中具有很高的实际意义。