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arXiv 1004.4906quant-phcond-mat.str-el
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量子计算重正化在Halfton阶段

Quantum computational renormalization in the Haldane phase

Stephen D. Bartlett, Gavin K. Brennen, Akimasa Miyake, Joseph M. Renes

摘要:

对相互作用自旋晶格的基态的单自旋测量可以用于执行量子计算。我们展示了如何这样的测量可以模仿重整化群变换和删除的状态,可以减少计算的保真度的短程变化。这表明自旋晶格的量子计算能力可能是量子相位的一个强大特性。我们用自旋为1的链的基态来说明我们的想法,它不仅可以在Affleck-Kennedy-Lieb-Tasaki点处作为量子计算线,而且可以在旋转不变的Halfen-phase内作为量子计算线。

英文摘要:

Single-spin measurements on the ground state of an interacting spin lattice can be used to perform a quantum computation. We show how such measurements can mimic renormalization group transformations and remove the short-ranged variations of the state that can reduce the fidelity of a computation. This suggests that the quantum computational ability of a spin lattice could be a robust property of a quantum phase. We illustrate our idea with the ground state of a spin-1 chain, which can serve as a quantum computational wire not only at the Affleck-Kennedy-Lieb-Tasaki point, but within the rotationally-invariant Haldane phase.

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