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arXiv 0709.0528quant-phcond-mat.mes-hall
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局部极小对绝热量子优化的影响

Effect of Local Minima on Adiabatic Quantum Optimization

M. H. S. Amin

摘要:

基于问题哈密顿量中的能级结构,我们提出了一种微扰方法来估计绝热量子优化的谱隙。我们发现,对于具有指数级大量的局部极小值接近全局最小值的问题,间隙变得指数级小,使得计算时间指数级长。绝热量子计算的量子优势然后可以仅经由局部绝热演化来访问,这需要贯穿演化的相位相干性和谱的知识。这样的问题,因此,不适合绝热量子计算。

英文摘要:

We present a perturbative method to estimate the spectral gap for adiabatic quantum optimization, based on the structure of the energy levels in the problem Hamiltonian. We show that for problems that have exponentially large number of local minima close to the global minimum, the gap becomes exponentially small making the computation time exponentially long. The quantum advantage of adiabatic quantum computation may then be accessed only via the local adiabatic evolution, which requires phase coherence throughout the evolution and knowledge of the spectrum. Such problems, therefore, are not suitable for adiabatic quantum computation.

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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