Spin lattices with two-body Hamiltonians for which the ground state encodes a cluster state

被引:18
作者
Griffin, Tom [1 ]
Bartlett, Stephen D. [1 ]
机构
[1] Univ Sydney, Sch Phys, Sydney, NSW 2006, Australia
来源
PHYSICAL REVIEW A | 2008年 / 78卷 / 06期
基金
澳大利亚研究理事会;
关键词
energy gap; ground states; lattice theory; quantum computing; quantum entanglement;
D O I
10.1103/PhysRevA.78.062306
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
We present a general procedure for constructing lattices of qubits with a Hamiltonian composed of nearest-neighbor two-body interactions such that the ground state encodes a cluster state. We give specific details for lattices in one, two, and three dimensions, investigating both periodic and fixed boundary conditions, as well as present a proof for the applicability of this procedure to any graph. We determine the energy gap of these systems, which is shown to be independent of the size of the lattice but dependent on the type of lattice (in particular, the coordination number), and investigate the scaling of this gap in terms of the coupling constants of the Hamiltonian. We provide a comparative analysis of the different lattice types with respect to their usefulness for measurement-based quantum computation.
引用
收藏
页数:15
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