Exploiting nonlinear oscillators for quantum information processing and measurement

该项目的主要目标是开发克尔参量振荡器（KPO）。这些KPO首先被用来产生巡回猫态，进一步的目标是观察混沌行为跨越量子经典边界，实现两个KPO门，并走向实现量子模拟使用KPOs.Several代的KPO已经设计，制造和实验表征。第一代遭受了高损失率，使得大多数提到的实验目标不可能实现。该设备每一代都得到改进，最近一代的性能可能允许对一些提到的实验进行原理证明。此外，我们知道如何进一步改善未来实验的设备特性。这个项目还没有导致发表的结果，是有希望的关于未来的结果。除了主要项目，我开发约瑟夫森参量放大器与轴子搜索团队的合作。这些放大器将使他们能够显示或排除轴子的存在，在一个更短的时间尺度比可能只使用传统的HEMT放大器。放大器经过测试工作，目前正在该项目中使用。到目前为止，我们已经共同撰写了两篇关于这个主题的论文。Kono在他的约瑟夫森量子滤波器开发项目中，旨在打破量子位的快速控制和由于控制线的存在而导致的量子位的衰变之间的权衡。

The main goal of the project was to develop Kerr Parametric Oscillators (KPOs). These KPOs were to be used first to generate itinerant cat states, with further goals being observation of chaotic behaviour across the quantum-classical boundary, implementing two-KPO gates, and moving towards implementations of quantum simulations using KPOs.Several generations of KPOs have been designed, fabricated, and experimentally characterized. The first generations suffered from high loss rates, rendering most of the mentioned experimental goals impossible. The device was improved each generation, and the most recent generation has properties that may allow proof-of-principle demonstrations of some of the mentioned experiments. Moreover, we know how to further improve the device characteristics for future experiments. This project has not yet lead to published results, is promising regarding future results.Besides the main project, I developed Josephson parametric amplifiers for a collaboration with an axion search team. These amplifiers will allow them to show or exclude the existence of axions in a much shorter timescale than would be possible using only conventional HEMT amplifiers. The amplifiers were tested to work, and are in current use within that project. We have so far co-authored 2 papers on this subject.I also collaborated with S. Kono on his project on developing a Josephson Quantum Filter, aiming to break the trade-off between fast control of a qubit, and the decay of that qubit due to the presence of the control line.