Microwave quantum optics on superconducting circuits

超导电路上的微波量子光学

• 批准号: 18F18799
• 负责人: 中村 泰信
• 金额: $ 1.41万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for JSPS Fellows
• 财政年份: 2018
• 资助国家: 日本
• 起止时间: 2018-11-09 至 2021-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-18F18799/
• 关键词: Superconducting qubit; microwave; quantum optics; quantum information

My work in this fiscal year consisted in developing a unidirectional emitter of　microwave photons to a 1D waveguide. This work is of particular interest　regarding the prospect of fabricating 1D quantum networks, where qubits coupled to a common waveguide can exchange quantum information with one another. Indeed, without some specific design that will lead to emission in a single direction, right or left, a qubit will naturally emit in both directions of the waveguide, which will thus scatter the quantum information in different locations. The same goes for absorption. If a photon from the waveguide impinges on a usual qubit from a single direction, the qubit will not be able to absorb the full photon. The device I propose, on the other hand, can absorb and emit photons unidirectionally, which allows us to circumvent this issue. The aim for now is to demonstrate the operation of a single of those unidirectional devices, coupled to an open transmission line. A large part of my time was devoted to predicting the behaviour of the systems we are considering from a theoretical point of view. By encoding the system’s physics into matrices and equations, we can calculate the time-evolution of a given physical system in time and deduce what will be its state at a future time. All these simulations were made using the Python programming language.

我在这个财政年度的工作包括将微波照片的单向发射器开发到1D波导。这项工作特别令人感兴趣，即制造一维量子网络的前景，量子耦合到公共波导可以彼此交换量子信息。实际上，如果没有一些特定的设计，这些设计将导致沿右或左侧的单个方向发射，量子将自然地沿波导的两个方向散发，从而将量子信息散布在不同位置。抽象也是如此。如果来自波导的光子会从单个方向上撞击通常的值，则量子将无法吸收完整的光子。另一方面，我提出的设备可以单向吸收和发射照片，这使我们能够避免此问题。目前的目的是演示这些单向设备中的单个设备的操作，并与开放的传输线相连。从理论的角度来看，我很大一部分时间专门用于预测我们正在考虑的系统的行为。通过将系统的物理学编码为物质和方程式，我们可以在时间上计算给定物理系统的时间进化，并在将来的时间推断出它的状态。所有这些模拟都是使用Python编程语言进行的。