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arXiv 2008.13329quant-phcond-mat.dis-nn
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多体动力学的神经网络变分量子算法

A Neural-Network Variational Quantum Algorithm for Many-Body Dynamics

Chee-Kong Lee, Pranay Patil, Shengyu Zhang, Chang-Yu Hsieh

摘要:

提出了一种神经网络变分量子算法来模拟量子多体系统的时间演化。基于改进的限制玻尔兹曼机(RBM)波函数模型,该算法可以在短期量子计算机中以较低的测量成本有效地实现。使用量子比特回收策略,仅需要一个辅助量子比特来表示RBM架构中的所有隐藏自旋。变分算法推广到开放量子系统通过采用随机薛定谔方程的方法。自旋晶格模型的数值模拟表明,我们的算法是能够捕获的封闭和开放的量子多体系统的动力学与高精度,而不会遭受消失的梯度(或“贫瘠的高原”)的问题所考虑的系统尺寸。

英文摘要:

We propose a neural-network variational quantum algorithm to simulate the time evolution of quantum many-body systems. Based on a modified restricted Boltzmann machine (RBM) wavefunction ansatz, the proposed algorithm can be efficiently implemented in near-term quantum computers with low measurement cost. Using a qubit recycling strategy, only one ancilla qubit is required to represent all the hidden spins in an RBM architecture. The variational algorithm is extended to open quantum systems by employing a stochastic Schrodinger equation approach. Numerical simulations of spin-lattice models demonstrate that our algorithm is capable of capturing the dynamics of closed and open quantum many-body systems with high accuracy without suffering from the vanishing gradient (or 'barren plateau') issue for the considered system sizes.

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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