论文标题

量子至上和量子相变

Quantum supremacy and quantum phase transitions

论文作者

Thanasilp, Supanut, Tangpanitanon, Jirawat, Lemonde, Marc-Antoine, Dangniam, Ninnat, Angelakis, Dimitris G.

论文摘要

证明现有量子平台执行与古典计算机相互涉及的某些计算任务的能力代表了量子计算中的基石。尽管此类提出的“量子至尊”任务越来越多,但确定其直接应用仍然是一个重要的挑战。在这项工作中,我们描述了参考文献中提出的方法。 [ARXIV:2002.11946]用于在通用驱动的模拟多体系统中证明量子至上,例如在冷原子和离子设置中发现的系统,可以扩展以探索动态量子相变。我们展示了如何将关键的量子至上签名(例如,在至高无上制度下的输出分布与预期的搬运工托马斯分布之间的距离之间的距离,都可以用作有效订单参数。我们将这种方法应用于定期驱动的无序1D ISING模型,并表明我们可以准确捕获驱动的热化和多体局部相之间的过渡。这种方法还捕获了向浮球式预先驾驶的过渡,以进行高频驾驶。在最近关于量子至上的讨论的情况下,重新审视物质的量子阶段,与复杂性理论与模拟多体系统之间的联系。

Demonstrating the ability of existing quantum platforms to perform certain computational tasks intractable to classical computers represents a cornerstone in quantum computing. Despite the growing number of such proposed "quantum supreme" tasks, it remains an important challenge to identify their direct applications. In this work, we describe how the approach proposed in Ref. [arXiv:2002.11946] for demonstrating quantum supremacy in generic driven analog many-body systems, such as those found in cold atom and ion setups, can be extended to explore dynamical quantum phase transitions. We show how key quantum supremacy signatures, such as the distance between the output distribution and the expected Porter Thomas distribution at the supremacy regime, can be used as effective order parameters. We apply this approach to a periodically driven disordered 1D Ising model and show that we can accurately capture the transition between the driven thermalized and many-body localized phases. This approach also captures the transition towards the Floquet prethermalized regime for high-frequency driving. Revisiting quantum phases of matter under the light of the recent discussions about quantum supremacy draws a link between complexity theory and analog many-body systems.

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