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arXiv 2112.04435quant-ph
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在量子计算机上模拟自旋缺陷的电子结构

Simulating the electronic structure of spin defects on quantum computers

Benchen Huang, Marco Govoni, Giulia Galli

AI总结:

本文提出使用混合经典/量子协议在量子计算机上模拟固体自旋缺陷电子结构,结合量子嵌入理论与VQE算法计算基态和激发态,并提出噪声缓解策略以在近期含噪架构上获得准确结果。

摘要:

我们使用混合经典/量子协议,在量子计算机上对固体中自旋缺陷的基态和激发态能量进行了计算。我们重点关注金刚石中的带负电氮空位中心以及4H-SiC中的双空位,它们对于实现量子技术具有重要意义。我们采用最近发展的第一性原理量子嵌入理论来描述嵌入在周期性晶体中的点缺陷,并推导出有效哈密顿量,然后通过宇称变换将其转化为量子比特哈密顿量。我们使用变分量子本征求解器(VQE)和量子子空间展开方法分别获取自旋量子比特的基态和激发态,并提出了一种有前景的噪声缓解策略。我们表明,通过结合零噪声外推技术和对电子占据数的约束,以克服VQE算法的非物理态问题,可以在近期含噪架构上获得关于自旋缺陷基态和激发态性质的合理准确结果。

英文摘要:

We present calculations of the ground and excited state energies of spin defects in solids carried out on a quantum computer, using a hybrid classical/quantum protocol. We focus on the negatively charged nitrogen vacancy center in diamond and on the double vacancy in 4H-SiC, which are of interest for the realization of quantum technologies. We employ a recently developed first-principle quantum embedding theory to describe point defects embedded in a periodic crystal, and to derive an effective Hamiltonian, which is then transformed to a qubit Hamiltonian by means of a parity transformation. We use the variational quantum eigensolver (VQE) and quantum subspace expansion methods to obtain the ground and excited states of spin qubits, respectively, and we propose a promising strategy for noise mitigation. We show that by combining zero-noise extrapolation techniques and constraints on electron occupation to overcome the unphysical state problem of the VQE algorithm, one can obtain reasonably accurate results on near-term-noisy architectures for ground and excited state properties of spin defects.

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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