Title: Electrical-control of third-order nonlinearity via Fano interference Show Chinese title

Title: 通过法诺干涉实现三阶非线性的电控

Abstract: Programmable photonic computers necessitate the integration of electrically-tunable compact components into the photonic devices. In the state-of-the-art photonic quantum computers~(PQCs), phase-shift and displacement gates can be implemented in an electrically-programmable way. An efficient PQC, however, necessitates also the tuning of third or higher order nonlinearity for implementing continuous-variable~(CV) gates at a shorter sequence. Here, we demonstrate that such an optical component can be designed using Fano interference and Stark effect in a nonlinear nano-plasmonic system. We study the coupling of a broadband bright plasmon mode to a narrow linewidth quantum object(s), QO(s). We show that by shifting the level-spacing of the QO via Stark effect, one can continuously tune the third-order nonlinearity gate within a picosecond response time. We also present finite-difference time domain~(FDTD) simulations that take the retardation effects into account. In addition, we also show that enhancement due to Fano interference degrades if the QOs are positioned randomly as each QO introduces different phases. This reveals the importance of the spatial extent of the QO-ensemble to be employed in the experiments. Show Chinese abstract

Abstract: 可编程光子计算机需要将电可调的紧凑组件集成到光子器件中。 在最先进的光子量子计算机（PQCs）中，相位移和位移门可以以电可编程的方式实现。 然而，高效的PQC还需要对三阶或更高阶的非线性进行调谐，以便在较短的序列中实现连续变量（CV）门。 在这里，我们证明这种光学元件可以通过非线性纳米等离子系统中的法诺干涉和斯塔克效应来设计。 我们研究了宽带亮等离子体模式与窄线宽量子对象（QO）的耦合。 我们表明，通过斯塔克效应改变QO的能级间距，可以在皮秒响应时间内连续调谐三阶非线性门。 我们还提供了考虑了延迟效应的有限差分时域（FDTD）模拟。 此外，我们还表明，如果QO随机放置，由于法诺干涉引起的增强会退化，因为每个QO引入了不同的相位。 这揭示了在实验中使用的QO集合的空间范围的重要性。