严格的自由费米子纠缠重整化小波理论
Rigorous free fermion entanglement renormalization from wavelet theory
摘要：
我们构造了纠缠重整化方案，它们可以证明在一维离散线和二维正方晶格上近似非相互作用费米子最近邻跳跃哈密顿量的基态。这些方案给出了分层的量子线路，它从非纠缠的自由度建立状态。该电路是基于对离散小波变换，这是近似相关的“半移位”：平移半个单位细胞。二维模型中费米面的存在需要一种特殊的电路结构来正确地捕获基态中的纠缠。我们展示了如何在近似误差可以控制，而无需进行变分优化。
英文摘要：
We construct entanglement renormalization schemes which provably approximate the ground states of non-interacting fermion nearest-neighbor hopping Hamiltonians on the one-dimensional discrete line and the two-dimensional square lattice. These schemes give hierarchical quantum circuits which build up the states from unentangled degrees of freedom. The circuits are based on pairs of discrete wavelet transforms which are approximately related by a "half-shift": translation by half a unit cell. The presence of the Fermi surface in the two-dimensional model requires a special kind of circuit architecture to properly capture the entanglement in the ground state. We show how the error in the approximation can be controlled without ever performing a variational optimization.
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