Fiber source of entangled photons with giant tunable frequency separation

具有巨大可调谐频率分离的纠缠光子光纤源

• 批准号: 433761978
• 负责人: Professorin Dr. Maria Chekhova, Ph.D.
• 金额: --
• 依托单位: Max-Planck-Institut für die Physik des Lichts
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/433761978?language=en
• 关键词: Fiber; source; entangled; photons; giant

Nonclassical states of light are an indispensable tool in many quantum technologies. Most demanded are pairs of entangled photons (biphotons), which are used for the heralded generation of single photons for quantum communication and quantum computation, and for quantum imaging, sensing, and spectroscopy. The diverse applications of entangled photon pairs lead to challenging requirements to their production. Highly demanded is the tunability of both the frequency range and the mode content. In particular, quantum imaging requires reliable multimode sources; on the contrary, heralded production of pure single photons dictates a need for single-mode biphotons. Recently a lot of interest is attracted to imaging and spectroscopy ‘with undetected photons’, based on the ‘induced coherence’ effect with entangled photons. Due to ‘induced coherence’, one can perform imaging or spectroscopy of any material at the frequency of one photon by looking at the photon entangled to it, which can be at a very different frequency. These methods give access to ‘difficult’ spectral ranges like mid-infrared (MIR) and terahertz.Imaging, sensing, and spectroscopy with undetected photons require sources of entangled photons with large spectral separation within the pairs. In this proposal, we aim at the generation of entangled photon pairs with the signal and idler photons separated in frequency by more than three octaves, one of them being in the UV range and the other in the IR range of spectrum. Here we plan to exploit third-order nonlinearity in gas-filled hollow-core photonic crystal fibers. These offer several advantages over the sources relying on second-order nonlinearity. First of all, the pump does not need to have a shorter wavelength than the daughter photons. We expect to achieve phase-matched narrow sidebands with a very large separation from the pump wavelength. Additionally, the dispersion of the system can be finely adjusted through the pressure of the filling gas, which makes such a system extremely versatile. This will allow not only tuning of the wavelength of the generated sidebands, but also a full control of the frequency mode content of the generated entangles states. As a test, we will carry out time ghost imaging and induced coherence experiments using the obtained fiber source. Such a project is at the frontier of two disciplines: nonlinear fiber optics and quantum optics.

光的非经典态是许多量子技术中不可或缺的工具。最需要的是纠缠光子对（双光子），用于量子通信和量子计算的单光子的产生，以及量子成像，传感和光谱学。纠缠光子对的各种应用导致了对其生产的挑战性要求。对频率范围和模式内容的可调谐性有很高的要求。特别是，量子成像需要可靠的多模光源;相反，纯单光子的产生预示着需要单模双光子。基于纠缠光子的“诱导相干”效应，近年来，人们对“未探测光子”的成像和光谱学产生了浓厚的兴趣。由于“诱导相干性”，人们可以通过观察纠缠到它的光子，以一个光子的频率对任何材料进行成像或光谱分析，这可能是一个非常不同的频率。这些方法提供了对中红外（MIR）和太赫兹等“困难”光谱范围的访问。使用未检测到的光子进行成像、传感和光谱分析需要纠缠光子源，这些纠缠光子对之间具有较大的光谱分离。在这个提议中，我们的目标是产生纠缠光子对的信号和空闲光子在频率上分离超过三个倍频程，其中一个是在紫外范围内，另一个在红外光谱范围内。在这里，我们计划利用充气空芯光子晶体光纤的三阶非线性。与依赖于二阶非线性的源相比，这些提供了几个优点。首先，泵浦不需要具有比子光子更短的波长。我们期望实现相位匹配的窄边带，与泵浦波长有很大的分离。此外，该系统的分散可以通过填充气体的压力进行精细调节，这使得这种系统非常通用。这将不仅允许调谐所生成的边带的波长，而且允许完全控制所生成的纠缠态的频率模式内容。作为测试，我们将使用所获得的光纤光源进行时间鬼像成像和诱导相干实验。这样的项目处于两个学科的前沿：非线性光纤光学和量子光学。