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arXiv 2108.03282quant-phcs.NAmath.NA
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量子线路的哈密顿演化代数压缩

Algebraic Compression of Quantum Circuits for Hamiltonian Evolution

Efekan Kökcü, Daan Camps, Lindsay Bassman, James K. Freericks, Wibe A. de Jong, Roel Van Beeumen, Alexander F. Kemper

摘要:

含时哈密顿量下的幺正演化是量子硬件模拟的关键组成部分。合成相应的量子线路通常是通过将演化分解为小的时间步长来完成的,也称为Trotterization,这导致电路的深度与步长的数量成比例。当电路元件被限制在SU(4)的子集时--或者等价地,当哈密顿量可以映射到自由费米子模型上时--存在几个恒等式来组合和简化电路。在此基础上,我们提出了一种算法,压缩到一个单一的块的量子门的特罗特步骤。这导致在一个固定的深度时间演化的某些类的哈密顿。我们明确地展示了这种算法如何适用于几种自旋模型,并展示了它的使用绝热态制备的横向场伊辛模型。

英文摘要:

Unitary evolution under a time dependent Hamiltonian is a key component of simulation on quantum hardware. Synthesizing the corresponding quantum circuit is typically done by breaking the evolution into small time steps, also known as Trotterization, which leads to circuits whose depth scales with the number of steps. When the circuit elements are limited to a subset of SU(4) -- or equivalently, when the Hamiltonian may be mapped onto free fermionic models -- several identities exist that combine and simplify the circuit. Based on this, we present an algorithm that compresses the Trotter steps into a single block of quantum gates. This results in a fixed depth time evolution for certain classes of Hamiltonians. We explicitly show how this algorithm works for several spin models, and demonstrate its use for adiabatic state preparation of the transverse field Ising model.

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