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arXiv 1908.07958quant-phcond-mat.str-el
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矩阵乘积态在单量子位和双量子位门量子线路中的编码

Encoding of Matrix Product States into Quantum Circuits of One- and Two-Qubit Gates

Shi-Ju Ran

摘要:

矩阵乘积态(MPS)属于例如凝聚态物理和量子信息科学中最重要的数学模型。然而,在量子平台上实现具有大$N$和大纠缠的$N$ -量子比特MPS是极其具有挑战性的,因为它需要高级别量子比特或两级量子比特的多体门来携带纠缠。在这项工作中,提出了一种有效的方法,准确地编码一个给定的MPS到一个量子线路只有一个和两个量子比特门。其思想是构造酉矩阵乘积算子,使MPS最优解纠缠为乘积状态。这些矩阵乘积算子形成了将乘积状态以高保真度演化为目标MPS的量子线路。我们对强关联自旋模型的基态MPS的基准测试表明,所构建的量子线路可以用比MPS本身的大小少得多的量子比特来编码MPS。该方法为在近期量子平台上实现量子多体态和其他基于MPS的模型作为量子线路提供了一条可行而有效的途径。

英文摘要:

The matrix product state (MPS) belongs to the most important mathematical models in, for example, condensed matter physics and quantum information sciences. However, to realize an $N$-qubit MPS with large $N$ and large entanglement on a quantum platform is extremely challenging, since it requires high-level qudits or multi-body gates of two-level qubits to carry the entanglement. In this work, an efficient method that accurately encodes a given MPS into a quantum circuit with only one- and two-qubit gates is proposed. The idea is to construct the unitary matrix product operators that optimally disentangle the MPS to a product state. These matrix product operators form the quantum circuit that evolves a product state to the targeted MPS with a high fidelity. Our benchmark on the ground-state MPS's of the strongly-correlated spin models show that the constructed quantum circuits can encode the MPS's with much fewer qubits than the sizes of the MPS's themselves. This method paves a feasible and efficient path to realizing quantum many-body states and other MPS-based models as quantum circuits on the near-term quantum platforms.

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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