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arXiv quant-ph/0604193quant-ph
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分子能量的模拟量子计算

Simulated Quantum Computation of Molecular Energies

Alán Aspuru-Guzik, Anthony D. Dutoi, Peter J. Love, Martin Head-Gordon

摘要:

在经典计算机上,原子和分子能量的计算时间与系统大小呈指数关系,但使用量子算法则是多项式关系。我们证明,这样的算法可以应用于化学感兴趣的问题,使用适度数量的量子比特。在量子计算机模拟器上用递归相位估计算法计算了水和氢化锂分子的基态能量。递归算法将读出寄存器所需的量子位的数量从大约20减少到4。描述了分子波函数到量子比特的映射。本文描述了一种制备良好的近似基态波函数的绝热方法,并以拉伸氢分子为例进行了论证。所需的量子比特的数量与基函数的数量成线性比例,并且所需的门的数量与量子比特的数量成多项式增长。

英文摘要:

The calculation time for the energy of atoms and molecules scales exponentially with system size on a classical computer but polynomially using quantum algorithms. We demonstrate that such algorithms can be applied to problems of chemical interest using modest numbers of quantum bits. Calculations of the water and lithium hydride molecular ground-state energies have been carried out on a quantum computer simulator using a recursive phase-estimation algorithm. The recursive algorithm reduces the number of quantum bits required for the readout register from about 20 to 4. Mappings of the molecular wave function to the quantum bits are described. An adiabatic method for the preparation of a good approximate ground-state wave function is described and demonstrated for a stretched hydrogen molecule. The number of quantum bits required scales linearly with the number of basis functions, and the number of gates required grows polynomially with the number of quantum bits.

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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