Baraban M, Zikos G, Bonesteel N, Simon S H
Department of Physics, Yale University, 217 Prospect Street, New Haven, Connecticut 06511, USA.
Phys Rev Lett. 2009 Aug 14;103(7):076801. doi: 10.1103/PhysRevLett.103.076801. Epub 2009 Aug 11.
We demonstrate numerically that non-Abelian quasihole (qh) excitations of the nu=5/2 fractional quantum Hall state have some of the key properties necessary to support quantum computation. We find that as the qh spacing is increased, the unitary transformation which describes winding two qh's around each other converges exponentially to its asymptotic limit and that the two orthogonal wave functions describing a system with four qh's become exponentially degenerate. We calculate the length scales for these two decays to be xi(U) approximately 2.7l(0) and xi(E) approximately 2.3l(0), respectively. Additionally, we determine which fusion channel is lower in energy when two qh's are brought close together.
我们通过数值计算证明,ν = 5/2 分数量子霍尔态的非阿贝尔准空穴(qh)激发具有支持量子计算所需的一些关键特性。我们发现,随着 qh 间距的增加,描述两个 qh 相互缠绕的酉变换会指数收敛到其渐近极限;并且描述具有四个 qh 的系统的两个正交波函数会指数简并。我们计算出这两种衰减的长度尺度分别为 ξ(U) ≈ 2.7l(0) 和 ξ(E) ≈ 2.3l(0)。此外,我们还确定了将两个 qh 靠近时哪个融合通道能量更低。