OP: Full Temporal Characterization of Interacting Photon Wavefunctions Using Real-Time Multi-Mode Quantum Measurements

量子信息科学领域正在迅速发展，因为新的量子技术将带来预期的影响，如安全通信协议，改进的测量系统和革命性的计算方法。 许多这些技术需要非线性光学现象和相关光量子或光子的来源。 该项目将开创新的方法来产生和表征光的复杂量子态。一个目标是使用围绕冷原子样品的光学腔，以增强一束光束控制另一束光束相移的方式。 第二个目标是使用图形处理器单元（GPU）来实时表征光的量子态。 这将作为量子网络的基准测试工具，并允许在复杂的量子门和存储器网络中实时调整操作参数。 开发用于量子网络实时表征的工具，培养从事该项目的学生使用计算机工程，原子物理和光子学的尖端技术。本研究有三个主要目标。首先，部署不同的新物理平台，其中可以观察到单光子量子非线性。第二，设计和实现了最先进的表征工具，使人们有可能在扩展的希尔伯特空间中探索门过程的量子过程层析成像。 第三，实现了单光子场量子门操作的实验。这个项目的首要目标是了解在具有多个光频模式的框架中控制原子介导的光子-光子相互作用的物理学。 为了研究量子相位门的性能，该团队将使用GPU硬件开发量子态评估工具。 这种方法还将使使用相互作用的光子的相移操作的实时表征成为可能。

The field of quantum information science is rapidly advancing because of the anticipated impacts that will come from new quantum technologies such as secure communication protocols, improved measurement systems, and revolutionary computing methods. Many of these technologies require nonlinear optical phenomena and sources of correlated light quanta, or photons. This project will pioneer new ways to generate and characterize complex quantum states of light. One aim is to use optical cavities surrounding a sample of cold atoms in order to enhance the way one light beam can control the phase shift for another light beam. A second aim is to use a graphical processor unit (GPU) for real-time characterization of quantum states of light. This will serve as a benchmarking tool for quantum networks, and allow on-the-fly tuning of operational parameters in sophisticated networks of quantum gates and memories. Developing tools for real-time characterization of quantum networks trains students working on this project to use cutting-edge technologies from computer engineering, atomic physics, and photonics.This research has three main thrusts. First, the deployment of different novel physical platforms in which single-photon level quantum nonlinearities can be observed. Second, the design and implementation of state-of-the-art characterization tools that make it possible to explore the quantum process tomography of the gate processes in an extended Hilbert space. Third, the realization of experiments to develop reliable quantum gate operations with single photon fields. An overarching goal of this project is to understand the physics governing atom-mediated photon-photon interactions in a framework with multiple optical frequency modes. To study the performance of quantum phase gates, the team will use GPU hardware to develop quantum state evaluation tools. This approach will also enable real-time characterization of phase-shift operations using interacting photons.