论文标题
减少与斩:浅电路,以解决更深的问题
Reduce&chop: Shallow circuits for deeper problems
论文作者
论文摘要
最先进的量子计算机只能可靠地执行量子数和计算深度有限的电路。这严重降低了可以运行的算法范围。尽管已经发明了许多技术来利用少量设备,但对深度限制计算的相应方案的探索较少。这项工作调查了我们可以在多大程度上通过反复使用较浅的设备来模仿更深量量子计算的性能。我们提出了一种用于此目的的方法,灵感来自Feynman模拟,在该模拟中,给定的电路被切成两部分。第一件作品是在早期执行和测量的,第二件作品是根据先前的结果运行的。由于可能的结果数量大量,因此以直接的方式应用了此方法。为了减轻此问题,我们提出了一个浅层变异电路,其目的是将方法的复杂性保持在预定的可耐受性限制中,并提供一种新的优化方法来查找此类电路。这些方法的这些成分的组成称为降低\&cop。当我们讨论时,这种方法适合某些感兴趣的情况。我们认为,这项工作可能会刺激新的研究,以利用浅量子计算机的潜力。
State-of-the-art quantum computers can only reliably execute circuits with limited qubit numbers and computational depth. This severely reduces the scope of algorithms that can be run. While numerous techniques have been invented to exploit few-qubit devices, corresponding schemes for depth-limited computations are less explored. This work investigates to what extent we can mimic the performance of a deeper quantum computation by repeatedly using a shallower device. We propose a method for this purpose, inspired by Feynman simulation, where a given circuit is chopped in two pieces. The first piece is executed and measured early on, and the second piece is run based on the previous outcome. This method is inefficient if applied in a straightforward manner due to the high number of possible outcomes. To mitigate this issue, we propose a shallow variational circuit, whose purpose is to maintain the complexity of the method within pre-defined tolerable limits, and provide a novel optimisation method to find such circuit. The composition of these components of the methods is called reduce\&chop. As we discuss, this approach works for certain cases of interest. We believe this work may stimulate new research towards exploiting the potential of shallow quantum computers.