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arXiv 1606.07413quant-ph
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简化量子线路综合

Parallelizing quantum circuit synthesis

Olivia Di Matteo, Michele Mosca

摘要:

量子线路合成是将任意幺正操作分解为来自通用集合的门序列的过程,通常是量子计算机可以有效且容错地实现的一个通用集合。随着量子计算机物理实现的改进,对能够有效合成电路组件和它们将运行的算法的工具的需求正在增长。用于精确的多量子位电路合成的现有算法在量子位的数量和电路深度上呈指数级缩放,使得在多于少数量子位上的电路的合成难以处理。即使是电路综合过程中的适度改进也可能导致重大进步,不仅推动了可解决的电路综合问题的大小的边界,而且还推动了由于具有更高效的电路而可以物理实现的边界。提出了一种基于确定性行走的量子线路综合方法。也称为伪随机游动,这些游动是一旦选择了起始点,其路径就完全确定的游动。我们应用我们的方法来构建一个并行的电路综合框架,并实现这样一个版本执行最佳的$T$计数合成的Clifford+ $T$门集。我们使用我们的软件来呈现并行化在运行时上提供显著加速的示例,以及直接确认4量子位1位全加器具有最佳的$T$ -计数7和$T$ -深度3。

英文摘要:

Quantum circuit synthesis is the process in which an arbitrary unitary operation is decomposed into a sequence of gates from a universal set, typically one which a quantum computer can implement both efficiently and fault-tolerantly. As physical implementations of quantum computers improve, the need is growing for tools which can effectively synthesize components of the circuits and algorithms they will run. Existing algorithms for exact, multi-qubit circuit synthesis scale exponentially in the number of qubits and circuit depth, leaving synthesis intractable for circuits on more than a handful of qubits. Even modest improvements in circuit synthesis procedures may lead to significant advances, pushing forward the boundaries of not only the size of solvable circuit synthesis problems, but also in what can be realized physically as a result of having more efficient circuits. We present a method for quantum circuit synthesis using deterministic walks. Also termed pseudorandom walks, these are walks in which once a starting point is chosen, its path is completely determined. We apply our method to construct a parallel framework for circuit synthesis, and implement one such version performing optimal $T$-count synthesis over the Clifford+$T$ gate set. We use our software to present examples where parallelization offers a significant speedup on the runtime, as well as directly confirm that the 4-qubit 1-bit full adder has optimal $T$-count 7 and $T$-depth 3.

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