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arXiv 0808.2697quant-phmath-phmath.MP
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多体系统指数精度绝热近似与量子计算

Adiabatic approximation with exponential accuracy for many-body systems and quantum computation

D. A. Lidar, A. T. Rezakhani, A. Hamma

摘要:

我们推导出一个版本的绝热定理,特别适合于绝热量子计算中的应用,在那里它是合理的假设,初始和最终的哈密顿之间的绝热插值是可控的。假设哈密顿量在围绕实时间轴的有限条中是解析的,其一些时间导数在初始时间和最终时间处消失,并且目标绝热本征态是非简并的并且通过间隙与谱的其余部分分离,我们表明,人们可以得到最终绝热本征态和实际时间之间的误差-在演化时间中呈指数小的演化状态,其中该时间本身按哈密顿量的时间导数的范数的平方除以最小间隙的立方来缩放。

英文摘要:

We derive a version of the adiabatic theorem that is especially suited for applications in adiabatic quantum computation, where it is reasonable to assume that the adiabatic interpolation between the initial and final Hamiltonians is controllable. Assuming that the Hamiltonian is analytic in a finite strip around the real time axis, that some number of its time-derivatives vanish at the initial and final times, and that the target adiabatic eigenstate is non-degenerate and separated by a gap from the rest of the spectrum, we show that one can obtain an error between the final adiabatic eigenstate and the actual time-evolved state which is exponentially small in the evolution time, where this time itself scales as the square of the norm of the time-derivative of the Hamiltonian, divided by the cube of the minimal gap.

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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