Integrated Microwave-to-Optical Conversion by Atoms on a superconducting chip

该项目的目标是为超导量子（子）处理器与光子之间的长距离量子通信铺平道路。我们将开发集成芯片，利用超冷原子系综实现微波和光子之间的转换。该项目开发的混合芯片，原子同时与微波和光腔场相互作用，可以连接到超导量子处理器和光纤通信网络，实现远程计算节点之间的相干链路。我们的项目将展示可集成在芯片上的微波到光转换的实验技术。我们将制作平面超导腔以及集成光波导和腔。在专门的冷原子实验中对光学和微波元件进行单独的评估和基准测试之后，我们将制造出将两者联合收割机结合起来的混合芯片。该项目的最终目标是评估超导原子芯片的操作和最佳设计，该芯片具有集成的微波和光学腔，用于光子的相干转换。该项目结合了来自五个欧洲国家（德国、法国、匈牙利、意大利和希腊）的五个实验和理论物理小组（图宾根- UT、波尔多-LP 2N、布达佩斯- WRCP、都灵- INRIM、赫拉克利翁- FORTH）的专业知识。该项目将为欧洲量子技术领域的卓越科学、竞争力和领导力做出贡献。该项目将探索微波和光子之间基于芯片的相干接口的几个新功能单元，为实现远距离量子（子）寄存器之间的量子链路铺平道路。该研究对量子通信、量子计算、量子计量和传感等领域都有直接的意义。

The goal of this project is to pave the way for long-distance quantum communications between superconducting quantum (sub)processors with optical photons. We shall develop integrated chips for the conversion between microwave and optical photons using ultracold atomic ensembles. The hybrid chip developed in this project, with atoms simultaneously interacting with microwave and optical cavity fields, could be connected to superconducting quantum processors and fiber optical communication networks for realizing coherent links between distant computational nodes. Our project will demonstrate experimental techniques for microwave to optical conversion that are integrable on chips. We will fabricate planar superconducting cavities as well as integrated optical waveguides and cavities. After separate evaluation and benchmarking of the optical and microwave components in dedicated cold atom experiments, we will fabricate hybrid chips that combine both. The final goal of the project is to evaluate the operation and optimal design of a superconducting atom chip with integrated microwave and optical cavities for the coherent transduction of photons. This project combines the expertise of five groups (Tübingen - UT, Bordeaux – LP2N, Budapest – WRCP, Turin – INRIM, Heraklion - FORTH) of experimental and theoretical physics, from five european countries: Germany, France, Hungary, Italy and Greece. The project will contribute to scientific excellence, competitiveness and leadership in the broad field of Quantum technologies at European level.The project will explore several new functional units of a chip-based coherent interface between microwave and optical photons, paving the way towards the realization of quantum links between distant quantum (sub)registers implemented with SC circuits. Theresearch has direct implications to the fields of quantum communication, quantum computation, and quantum metrology and sensing.