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arXiv 1703.03360cond-mat.mes-hallcond-mat.supr-con
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相互作用的Majorana量子线中的编织误差

Braiding errors in interacting Majorana quantum wires

Michael Sekania, Stephan Plugge, Martin Greiter, Ronny Thomale, Peter Schmitteckert

摘要:

马约拉纳束缚态途径已成为拓扑量子计算实现的主要方向之一。对于Kitaev量子线的Y型结,在考虑准粒子背景的情况下,我们数值研究了量子线的编织。编织误差的两个主要来源被认为是由于编织操作的不完全绝热性以及MBS的杂交导致的保真度损失。明确提取的编织阶段在低能量马约拉纳部门从完整的多粒子希尔伯特空间,使我们能够分析故障的独立粒子图片马约拉纳编织。此外,我们发现最近邻相互作用显着影响编织性能的更好或更差,这取决于耦合的符号和幅度。

英文摘要:

Avenues of Majorana bound states (MBSs) have become one of the primary directions towards a possible realization of topological quantum computation. For a Y-junction of Kitaev quantum wires, we numerically investigate the braiding of MBSs while considering the full quasi-particle background. The two central sources of braiding errors are found to be the fidelity loss due to the incomplete adiabaticity of the braiding operation as well as the hybridization of the MBS. The explicit extraction of the braiding phase in the low-energy Majorana sector from the full many-particle Hilbert space allows us to analyze the breakdown of the independent-particle picture of Majorana braiding. Furthermore, we find nearest-neighbor interactions to significantly affect the braiding performance to the better or worse, depending on the sign and magnitude of the coupling.

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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