Anyonic interferometry without anyons: how a flux qubit can read out a topological qubit
Anyonic interferometry without anyons: how a flux qubit can read out a topological qubit
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DOI：
10.1088/1367-2630/12/12/125002
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发表时间：
2010-12-01
影响因子：
3.3
通讯作者：
Beenakker, C. W. J.
中科院分区：
文献类型：
--
作者：
Hassler, F.;Akhmerov, A. R.;Beenakker, C. W. J.
通过涡旋的量子干涉来测量超导体中的非阿贝尔任意子的提议受到Abrikosov涡旋正常核的主要经典动力学的影响。我们展示了如何避免这种阻塞使用无核约瑟夫森涡旋，量子动力学已被证明实验。干涉仪是约瑟夫森结电路中的通量量子比特，它可以非破坏性地读出存储在一对任意子中的拓扑量子比特-即使约瑟夫森涡旋本身不是任意子。通量量子比特不耦合到内涡旋激发，从而消除了对超导体中任意子干涉测量的操作温度的主要限制。
Proposals to measure non-Abelian anyons in a superconductor by quantum interference of vortices suffer from the predominantly classical dynamics of the normal core of an Abrikosov vortex. We show how to avoid this obstruction using coreless Josephson vortices, for which the quantum dynamics has been demonstrated experimentally. The interferometer is a flux qubit in a Josephson junction circuit, which can non-destructively read out a topological qubit stored in a pair of anyons-even though the Josephson vortices themselves are not anyons. The flux qubit does not couple to intra-vortex excitations, thereby removing the dominant restriction on the operating temperature of anyonic interferometry in superconductors.