Decoherence in adiabatic quantum computation
Decoherence in adiabatic quantum computation
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DOI：
10.1103/physreva.79.022107
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发表时间：
2009-02-01
影响因子：
2.9
通讯作者：
Nesteroff, James A.
中科院分区：
文献类型：
--
作者：
Amin, M. H. S.;Averin, Dmitri V.;Nesteroff, James A.
我们研究了绝热量子计算(AQC)在非马尔科夫噪声(如低频噪声)存在下的退相干特性。对非相干Landau-Zener跃迁的描述表明，即使在退相干大于两个最低能级的反交叉处的最小间隙时，全局AQC仍保持其性质。然而，更有效的局部AQC并不像在无去相干的情况下那样改善计算时间与量子比特数n的比例。标度改进要求在整个计算过程中保持相位一致性，从而限制了计算时间和问题大小n。
We have studied the decoherence properties of adiabatic quantum computation (AQC) in the presence of in general non-Markovian, e.g., low-frequency, noise. The developed description of the incoherent Landau-Zener transitions shows that the global AQC maintains its properties even for decoherence larger than the minimum gap at the anticrossing of the two lowest-energy levels. The more efficient local AQC, however, does not improve scaling of the computation time with the number of qubits n as in the decoherence-free case. The scaling improvement requires phase coherence throughout the computation, limiting the computation time and the problem size n.