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arXiv quant-ph/0510183quant-ph
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绝热量子计算的一般误差估计

General error estimate for adiabatic quantum computing

Gernot Schaller, Sarah Mostame, Ralf Schützhold

摘要:

绝大多数绝热量子计算条件的研究都是基于一阶修正${\bra{Ψ_{\rm ground}(t)}\dot H(t)\ket{Ψ_{\rm excited}(t)} /ΔE^2(t)\ll1}$。然而,它表明,这种一阶校正不产生一个很好的估计的计算误差。因此,提出了一个更一般的标准,其中包括高阶校正,以及表明,计算误差可以指数小-这有利于显着更短的演变时间比上述一阶估计在某些情况下。基于该标准和相当一般的论点和假设,可以证明逆最小能隙$ΔE_{\rm min}$阶的运行时$T$是充分和必要的,即,$T=\ord(ΔE_{\rm min}^{-1})$。对于一些例子,这些分析研究证实了数值模拟。PACS:03.67.Lx,03.67.- a.

英文摘要:

Most investigations devoted to the conditions for adiabatic quantum computing are based on the first-order correction ${\bra{Ψ_{\rm ground}(t)}\dot H(t)\ket{Ψ_{\rm excited}(t)} /ΔE^2(t)\ll1}$. However, it is demonstrated that this first-order correction does not yield a good estimate for the computational error. Therefore, a more general criterion is proposed, which includes higher-order corrections as well and shows that the computational error can be made exponentially small -- which facilitates significantly shorter evolution times than the above first-order estimate in certain situations. Based on this criterion and rather general arguments and assumptions, it can be demonstrated that a run-time $T$ of order of the inverse minimum energy gap $ΔE_{\rm min}$ is sufficient and necessary, i.e., $T=\ord(ΔE_{\rm min}^{-1})$. For some examples, these analytical investigations are confirmed by numerical simulations. PACS: 03.67.Lx, 03.67.-a.

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