论文标题
无任意波形发生器的量子最佳控制
Quantum Optimal Control without Arbitrary Waveform Generators
论文作者
论文摘要
需要简单，精确且可靠的控制来操作大型量子信息处理器。但是，现有的高保真量子控制路线在很大程度上取决于难以扩展的任意波形发生器。在这里，我们表明，可以通过以适当的顺序打开和关闭控制场来实现对量子系统的任意控制。开关实例可以通过常规量子最佳控制算法设计，而矩阵指数所需的计算资源可以大大减少。我们证明了所得控制方案的灵活性和鲁棒性，并将其应用于超导量子电路以进行插图。我们希望通过当前的半导体和超导体技术可以很容易地实现这一建议，这为可扩展的量子计算提供了重要的一步。
Simple, precise, and robust control is demanded for operating a large quantum information processor. However, existing routes to high-fidelity quantum control rely heavily on arbitrary waveform generators that are difficult to scale up. Here, we show that arbitrary control of a quantum system can be achieved by simply turning on and off the control fields in a proper sequence. The switching instances can be designed by conventional quantum optimal control algorithms, while the required computational resources for matrix exponential can be substantially reduced. We demonstrate the flexibility and robustness of the resulting control protocol, and apply it to superconducting quantum circuits for illustration. We expect this proposal to be readily achievable with current semiconductor and superconductor technologies, which offers a significant step towards scalable quantum computing.
