期刊
PHYSICAL REVIEW B
卷 82, 期 18, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.82.180519
关键词
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资金
- DARPA
- NSF [DMR-0748925]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0748925] Funding Source: National Science Foundation
Recent proposals using heterostructures of superconducting and either topologically insulating or semiconducting layers have been put forth as possible platforms for topological quantum computation. These systems are predicted to contain Ising anyons and share the feature of having only neutral edge excitations. In this note, we show that these proposals can be combined with the recently proposed sack geometry for implementation of a phase gate in order to conduct robust universal quantum computation. In addition, we propose a general method for adjusting edge tunneling rates in such systems, which is necessary for the control of interferometric devices. The error rate for the phase gate in neutral Ising systems is parametrically smaller than for a similar geometry in which the edge modes carry charge: it goes as T-3 rather than T at low temperatures. At zero temperature, the phase variance becomes constant at long times rather than carrying a logarithmic divergence.
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