论文标题

通过量身定制的量子退火器来解决费米 - 哈伯德模型

Towards solving the Fermi-Hubbard model via tailored quantum annealers

论文作者

Levy, Ryan, Izquierdo, Zoe Gonzalez, Wang, Zhihui, Marshall, Jeffrey, Barreto, Joseph, Fry-Bouriaux, Louis, O'Connor, Daniel T., Warburton, Paul A., Wiebe, Nathan, Rieffel, Eleanor, Wudarski, Filip A.

论文摘要

长期以来,在二维方形晶格上的费米 - 哈伯德模型(FHM)一直是在量子硬件上模拟费米子哈密顿量的重要测试床和目标。我们提供了基于绝热协议的FHM量子模拟的替代方法,该方案可能是下一代量子退火器的有吸引力的目标。我们的结果依赖于最近引入的低重量编码,该编码允许FHM以最多三个的Pauli操作员来表达FHM。我们从理论上和数字上确定了相互作用的2D无旋转和跨度系统的有前途的量子退火设置,这使得可以在基态解决方案附近,具有高达$ 6 \ $ 6 \ times 6 $(无旋转)和$ 4 \ times times 3 $(跨度)的高级系统。此外,我们证明了最小间隙的缩放特性,并分析了对控制噪声的方案的鲁棒性。此外,我们确定并讨论了基本的实验要求,以构建量身定制的近期退火硬件,以模拟这些问题。最后,我们对引入的绝热协议执行了详细的资源估计,并讨论了这种方法相对于基于门的近期平台的方法和缺点。

The Fermi-Hubbard model (FHM) on a two dimensional square lattice has long been an important testbed and target for simulating fermionic Hamiltonians on quantum hardware. We present an alternative for quantum simulation of FHMs based on an adiabatic protocol that could be an attractive target for next generations of quantum annealers. Our results rely on a recently introduced low-weight encoding that allows the FHM to be expressed in terms of Pauli operators with locality of at most three. We theoretically and numerically determine promising quantum annealing setups for both interacting 2D spinless and spinful systems, that enable to reach near the ground state solution with high fidelity for systems as big as $6\times 6$ (spinless) and $4\times 3$ (spinful). Moreover, we demonstrate the scaling properties of the minimal gap and analyze robustness of the protocol against control noise. Additionally, we identify and discuss basic experimental requirements to construct near term annealing hardware tailored to simulate these problems. Finally, we perform a detailed resource estimation for the introduced adiabatic protocol, and discuss pros and cons of this approach relative to gate-based approaches for near-term platforms.

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