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arXiv 1105.4159quant-phcond-mat.stat-mechcond-mat.str-el
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具有拓扑序的三维自旋哈密顿量的能量图景

On the energy landscape of 3D spin Hamiltonians with topological order

Sergey Bravyi, Jeongwan Haah

摘要:

我们探讨了基于3D自旋哈密顿量的量子自校正存储器的可行性,其中拓扑缺陷的热扩散被宏观能垒抑制。为此,我们的特点稳定剂代码哈密顿与本地有界强度的相互作用,有一个拓扑有序的基态,但没有字符串的逻辑运算符的能量景观。我们证明,任何序列的本地错误映射的基态的这种哈密顿量的正交基态必须跨越的能量势垒增长至少作为对数的晶格尺寸。我们的束缚上的能量障碍被证明是紧到一个常数因子为一个特定的3D自旋哈密顿。

英文摘要:

We explore feasibility of a quantum self-correcting memory based on 3D spin Hamiltonians with topological quantum order in which thermal diffusion of topological defects is suppressed by macroscopic energy barriers. To this end we characterize the energy landscape of stabilizer code Hamiltonians with local bounded-strength interactions which have a topologically ordered ground state but do not have string-like logical operators. We prove that any sequence of local errors mapping a ground state of such Hamiltonian to an orthogonal ground state must cross an energy barrier growing at least as a logarithm of the lattice size. Our bound on the energy barrier is shown to be tight up to a constant factor for one particular 3D spin Hamiltonian.

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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