论文标题
探索量子电路的概念机综合
Exploring ab initio machine synthesis of quantum circuits
论文作者
论文摘要
栅极级量子电路通常是从高级算法中手动得出的。尽管这足以满足小型实施和演示，但最终将需要自动电路设计才能使用特定于硬件的操作和连接性实现复杂的算法。在这里，我们探讨了从头开始创建机器中电路的方法，无论是经典的计算机还是混合量子经典设备。我们考虑了一系列技术，包括：引入新的门结构，优化参数化电路和成本函数的选择，以及利用量子几何张量和其他启发式方法的低价值门的有效去除。使用这些原则，我们可以应对从一种形式到另一种形式的电路自动编码单一过程和翻译（重新编译）的任务。使用具有各种无噪声门集的仿真量子计算机，我们提供了最多涉及10个QUBIT的简单示例，对应于我们使用的增强空间中的20个Quinb。姐妹论文中考虑了与化学建模的特定相关性的进一步应用，“利用子空间约束和量子化学的差异方法”。
Gate-level quantum circuits are often derived manually from higher level algorithms. While this suffices for small implementations and demonstrations, ultimately automatic circuit design will be required to realise complex algorithms using hardware-specific operations and connectivity. Here we explore methods for the ab initio creation of circuits within a machine, either a classical computer or a hybrid quantum-classical device. We consider a range of techniques including: methods for introducing new gate structures, optimisation of parameterised circuits and choices of cost functions, and efficient removal of low-value gates exploiting the quantum geometric tensor and other heuristics. Using these principles we tackle the tasks of automatic encoding of unitary processes and translation (recompilation) of a circuit from one form to another. Using emulated quantum computers with various noise-free gate sets we provide simple examples involving up to 10 qubits, corresponding to 20 qubits in the augmented space we use. Further applications of specific relevance to chemistry modelling are considered in a sister paper, 'Exploiting subspace constraints and ab initio variational methods for quantum chemistry'.
