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arXiv 1409.3585quant-phcond-mat.str-elhep-th
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Fermi-哈伯德模型中散射的普适量子计算

Universal Quantum Computation by Scattering in the Fermi-Hubbard Model

Ning Bao, Patrick Hayden, Grant Salton, Nathaniel Thomas

摘要:

哈伯德模型可能是粒子在晶格上相互作用的最简单的模型,但是其动力学的模拟仍然超出了当前数值方法的范围。在这篇文章中,我们表明,一般的量子计算可以编码到物理波包传播通过一个平面图,与散射相互作用的费米哈伯德模型。因此,在平面图上模拟模型就像模拟量子计算一样困难。我们给出了两种不同的论证,证明了在强耦合的极限下,对作为费米真空激发的波包和填充率为一半的空穴波包的模拟都是困难的。在由t-J模型描述的后一种情况下,在散射事件中只有反射而没有透射,这与经典硬球的情况相同。从这个意义上说,这种结构提供了一个量子力学模拟的弗雷德金-托弗利台球计算机。

英文摘要:

The Hubbard model may be the simplest model of particles interacting on a lattice, but simulation of its dynamics remains beyond the reach of current numerical methods. In this article, we show that general quantum computations can be encoded into the physics of wave packets propagating through a planar graph, with scattering interactions governed by the fermionic Hubbard model. Therefore, simulating the model on planar graphs is as hard as simulating quantum computation. We give two different arguments, demonstrating that the simulation is difficult both for wave packets prepared as excitations of the fermionic vacuum, and for hole wave packets at filling fraction one-half in the limit of strong coupling. In the latter case, which is described by the t-J model, there is only reflection and no transmission in the scattering events, as would be the case for classical hard spheres. In that sense, the construction provides a quantum mechanical analog of the Fredkin-Toffoli billiard ball computer.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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