Quantum lattice algorithms: similarities and connections to some classic finite difference algorithms
Quantum lattice algorithms: similarities and connections to some classic finite difference algorithms
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量子点阵算法:与一些经典有限差分算法的相似性和联系
DOI:
10.1051/proc/201552005
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发表时间:
2016
期刊:
影响因子:
--
通讯作者:
Dellar P
中科院分区:
文献类型:
--
作者:
Dellar P
Quantum lattice algorithms originated with the Feynman checkerboard model for the one-dimensional Dirac equation. They offer discrete models of quantum mechanics in which the complex numbers representing wavefunction values on a discrete spatial lattice evolve through discrete unitary operations. This paper draws together some of the identical, or at least unitarily equivalent, algorithms that have appeared in three largely disconnected strands of research. Treated as conventional numerical algorithms, they are all only first order accurate under refinement of the discrete space/time grid, but may be raised to second order by a unitary change of variables. Much more efficient implementations arise from replacing the evolution through a sequence of unitary intermediate steps with a short path integral formulation that expresses the wavefunction at each spatial point on the most recent time level as a linear combination of values at immediately preceding time levels and neighbouring spatial points. In one dimension, a particularly elegant reformulation replaces two variables at two time levels with a single variable over three time levels. The resulting algorithm is a variational integrator arising from a discrete action principle, and coincides with the Ablowitz–Kruskal–Ladik finite difference scheme for the Klein–Gordon equation.
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影响因子:
1.3
作者:
F. Strauch
通讯作者:
F. Strauch
DOI:
--
发表时间:
1996
期刊:
影响因子:
--
作者:
D. Meyer
通讯作者:
D. Meyer
影响因子:
4
作者:
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通讯作者:
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DOI:
--
发表时间:
2011
期刊:
Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
影响因子:
--
作者:
D. Lapitski;P. Dellar
通讯作者:
P. Dellar
DOI:
--
发表时间:
2007
期刊:
影响因子:
--
作者:
P. Dellar
通讯作者:
P. Dellar