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Your search keyword '"Cheng, Qiu-Bo"' showing total 8 results
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8 results on '"Cheng, Qiu-Bo"'

1. The Simulation of Non-Abelian Statistics of Majorana Fermions in Ising Chain with Z2 Symmetry

Author

Zhao, Xiao-Ming, Yu, Jing, He, Jing, Cheng, Qiu-Bo, Liang, Ying, and Kou, Su-Peng

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics, Condensed Matter - Other Condensed Matter
Abstract

In this paper, we numerically study the non-Abelian statistics of the zero-energy Majorana fermions on the end of Majorana chain and show its application to quantum computing by mapping it to a spin model with special symmetry. In particular, by using transverse-field Ising model with Z2 symmetry, we verify the nontrivial non-Abelian statistics of Majorana fermions. Numerical evidence and comparison in both Majorana-representation and spin-representation are presented. The degenerate ground states of a symmetry protected spin chain therefore previde a promising platform for topological quantum computation., Comment: 5 pages,4 figures

Published
2016
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2. Classification of Majorana Fermions in Two-Dimensional Topological Superconductors

Author

Cheng, Qiu-Bo, He, Jing, and Kou, Su-Peng

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics, Condensed Matter - Superconductivity
Abstract

Recently, Majorana Fermions (MFs) have attracted intensive attention due to their exotic statistics and possible applications in topological quantum computation (TQC). They are proposed to exist in various two-dimensional (2D) topological systems, such as px+ipy topological superconductor and nanowire-superconducting hybridization system. In this paper, two types of Majorana Fermions with different polygon sign rules are pointed out. A "smoking gun" numerical evidence to identify MF's classification is presented through looking for the signature of a first order topological quantum phase transition. By using it, several 2D topological superconductors are studied.

Published
2015
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3. Verifying Non-Abelian Statistics by Numerical Braiding Majorana Fermions

Author

Cheng, Qiu-Bo, He, Jing, and Kou, Su-Peng

Subjects
Condensed Matter - Strongly Correlated Electrons, Condensed Matter - Superconductivity, High Energy Physics - Theory, Quantum Physics
Abstract

Recently, Majorana fermions (MFs) have attracted intensive attention because of their possible non-Abelian statistics. This paper points out an approach to verify the non-Abelian statistics of MFs in topological superconductors. We introduce a single particle representation of braiding operators that obey anti-commutating relation of Bogolubov-de Gennes (BdG) states. From the relationship between the braiding operator of MFs and that of BdG states, we verify non-Abelian statistics of MFs in 1D and 2D topological SCs., Comment: 4.5 pages, 2 figures

Published
2014

8. [Effects of ridge-cultivation and plastic film mulching on root distribution and yield of spring maize in hilly area of central Sichuan basin, China.]

Author

Zha L, Xie ML, Zhu M, Dou P, Cheng QB, Wang XL, Yuan JC, and Kong FL

Subjects
China, Plastics, Soil, Water, Agriculture, Plant Roots growth & development, Zea mays growth & development
Abstract

A field experiment was conducted to study the effects of planting pattern (ridge culture, flatten culture, furrow culture) and film mulching on the distribution of spring maize root system and their influence on the yield of spring maize in the hilly area of central Sichuan basin. The results showed that ridge and film mulching had great influence on root morphology and root distribution of maize. The root length, root surface area and root volume of film mulching was 42.3%, 50.0%, 57.4% higher than those of no film mulching at jointing stage. The film mulching significantly increased the dry mass of root in vertical and horizontal distribution, and increased the root allocation ratio in deeper soil layer (20-40 cm) and the allocation ratio of wide row (0-20 cm) in horizontal direction. The effects of planting pattern on root growth and root distribution differed by film mulching. With film mulching, the ridge culture significantly increased the root dry mass in each soil layer and enlarged the distribution percentage of wide row (20-40 cm) in horizontal direction, as well as the dry mass of root in horizontal distribution and the root allocation ratio of wide row. The root mass under film mulching was in the order of ridge culture>flatten culture>furrow culture. Without film mulching, the furrow culture significantly increased root dry mass of narrow row (0-40 cm), and the root mass under no film mulching was in the order of furrow culture > ridge culture >flatten culture. As for the spike characteristics and maize yield, the filming mulching mea-sures reduced the corn bald length while increased the spike length, grain number, 1000-grain mass and yield. The yield under film mulching was in the order of ridge culture>flatten culture> furrow culture, while it was furrow culture > flatten culture > ridge culture under no film mulching. The reason for yield increase under ridge culture with film mulching was that it increased root weight especially in deep soil, and promoted the root allocation ratio in deeper soil and wide row (20-40 cm) in horizontal direction. The ridge-furrow culture without film mulching was helpful to root growth and increased the maize yield.

Published
2016
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