Effective cutting of a quantum spin chain by bond impurities
Effective cutting of a quantum spin chain by bond impurities
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DOI：
10.1103/physreva.88.052336
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发表时间：
2013-09
影响因子：
2.9
通讯作者：
T. Apollaro;F. Plastina;L. Banchi;A. Cuccoli;A. Cuccoli;A. Cuccoli;R. Vaia;P. Verrucchi;M. Paternostro
中科院分区：
文献类型：
--
作者：
T. Apollaro;F. Plastina;L. Banchi;A. Cuccoli;A. Cuccoli;A. Cuccoli;R. Vaia;P. Verrucchi;M. Paternostro
自旋链是短距离量子通信的理想介质。它们的用处体现在所有涉及静止信息载体的情况中。在大多数依赖于量子自旋链的量子化方案中，后者被假定为长度有限，链端自旋可寻址。在本文中，我们提出，这样的配置实际上可以实现的机制，能够有效地通过插入键缺陷的自旋环切割。然后，我们将展示如何合适的物理量可以确定为品质因数的有效性的削减。我们发现，即使是适度的强度的键缺陷，环被有效地切割在缺陷部位。反过来，这对所产生的链上的自旋共享的相关性的数量有重要影响，我们通过一个明确的物理解释的基于散射的机制来研究。
Spin chains are promising media for short-haul quantum communication. Their usefulness is manifested in all thosesituationswherestationaryinformationcarriersareinvolved.Inthemajorityofthecommunicationschemes relying on quantum spin chains, the latter are assumed to be finite in length, with well-addressable end-chain spins. In this paper we propose that such a configuration could actually be achieved by a mechanism that is able to effectively cut a spin ring through the insertion of bond defects. We then show how suitable physical quantities can be identified as figures of merit for the effectiveness of the cut. We find that, even for modest strengths of the bond defect, a ring is effectively cut at the defect site. In turn, this has important effects on the amount of correlations shared by the spins across the resulting chain, which we study by means of a scattering-based mechanism of a clear physical interpretation.