利用浅层电路对量子态进行近似编码

IF 6.6 1区 物理与天体物理 Q1 PHYSICS, APPLIED
Matan Ben-Dov, David Shnaiderov, Adi Makmal, Emanuele G. Dalla Torre
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引用次数: 0

摘要

量子算法和模拟通常需要通过 2 量子位门序列来制备复杂状态。对于一般量子态来说,所需门的数量会随着量子比特数量的增加而呈指数增长,这在近期量子设备上是不可行的。在这里,我们的目标是使用有限数量的门来创建目标状态的近似编码。第一步,我们考虑一种经典有效表示的量子态,如一维矩阵乘积态。利用张量网络技术,我们开发并实现了一种高效的优化算法,该算法接近最优实现,只需要多项式数量的迭代。接下来,我们考虑直接在量子计算机上实现所提出的优化算法,并通过采用局部成本函数克服固有的贫瘠高原。我们的工作提供了一种利用局部门准备目标状态的通用方法,与已知策略相比有了显著改进。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Approximate encoding of quantum states using shallow circuits

Approximate encoding of quantum states using shallow circuits

Quantum algorithms and simulations often require the preparation of complex states through sequences of 2-qubit gates. For a generic quantum state, the number of required gates grows exponentially with the number of qubits, becoming unfeasible on near-term quantum devices. Here, we aim at creating an approximate encoding of the target state using a limited number of gates. As a first step, we consider a quantum state that is efficiently represented classically, such as a one-dimensional matrix product state. Using tensor network techniques, we develop and implement an efficient optimization algorithm that approaches the optimal implementation, requiring a polynomial number of iterations. We, next, consider the implementation of the proposed optimization algorithm directly on a quantum computer and overcome inherent barren plateaus by employing a local cost function. Our work offers a universal method to prepare target states using local gates and represents a significant improvement over known strategies.

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来源期刊
npj Quantum Information
npj Quantum Information Computer Science-Computer Science (miscellaneous)
CiteScore
13.70
自引率
3.90%
发文量
130
审稿时长
29 weeks
期刊介绍: The scope of npj Quantum Information spans across all relevant disciplines, fields, approaches and levels and so considers outstanding work ranging from fundamental research to applications and technologies.
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