期刊
PHYSICAL REVIEW LETTERS
卷 110, 期 9, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.110.090502
关键词
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资金
- NSERC
- Intelligence Advanced Research Projects Activity (IARPA) via the Department of Interior National Business Center [D11PC20167]
We study the robustness of quantum information stored in the degenerate ground space of a local, frustration-free Hamiltonian with commuting terms on a 2D spin lattice. On one hand, a macroscopic energy barrier separating the distinct ground states under local transformations would protect the information from thermal fluctuations. On the other hand, local topological order would shield the ground space from static perturbations. Here we demonstrate that local topological order implies a constant energy barrier, thus inhibiting thermal stability. DOI: 10.1103/PhysRevLett.110.090502
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