# An impurity-induced gap system as a quantum data bus for quantum state transfer

## Abstract

We introduce a tight-binding chain with a single impurity to act as a quantum data bus for perfect quantum state transfer. Our proposal is based on the weak coupling limit of the two outermost quantum dots to the data bus, which is a gapped system induced by the impurity. By connecting two quantum dots to two sites of the data bus, the system can accomplish a high-fidelity and long-distance quantum state transfer. Numerical simulations for finite system show that the numerical and analytical results of the effective coupling strength agree well with each other. Moreover, we study the robustness of this quantum communication protocol in the presence of disorder in the couplings between the nearest-neighbor quantum dots. We find that the gap of the system plays an important role in robust quantum state transfer.

- Authors:

- Department of Applied Physics, College of Electronics, Communication and Physics, Shandong University of Science and Technology, Qingdao 266590 (China)
- Beijing Computational Science Research Center, Beijing 100084 (China)
- School of Physics, Nankai University, Tianjin 300071 (China)

- Publication Date:

- OSTI Identifier:
- 22403391

- Resource Type:
- Journal Article

- Journal Name:
- Annals of Physics (New York)

- Additional Journal Information:
- Journal Volume: 348; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0003-4916

- Country of Publication:
- United States

- Language:
- English

- Subject:
- 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; COMMUNICATIONS; COMPUTERIZED SIMULATION; COUPLINGS; DISTANCE; QUANTUM DOTS; QUANTUM INFORMATION; QUANTUM STATES

### Citation Formats

```
Chen, Bing, E-mail: chenbingphys@gmail.com, Li, Yong, Song, Z., and Sun, C.-P.
```*An impurity-induced gap system as a quantum data bus for quantum state transfer*. United States: N. p., 2014.
Web. doi:10.1016/J.AOP.2014.05.025.

```
Chen, Bing, E-mail: chenbingphys@gmail.com, Li, Yong, Song, Z., & Sun, C.-P.
```*An impurity-induced gap system as a quantum data bus for quantum state transfer*. United States. doi:10.1016/J.AOP.2014.05.025.

```
Chen, Bing, E-mail: chenbingphys@gmail.com, Li, Yong, Song, Z., and Sun, C.-P. Mon .
"An impurity-induced gap system as a quantum data bus for quantum state transfer". United States. doi:10.1016/J.AOP.2014.05.025.
```

```
@article{osti_22403391,
```

title = {An impurity-induced gap system as a quantum data bus for quantum state transfer},

author = {Chen, Bing, E-mail: chenbingphys@gmail.com and Li, Yong and Song, Z. and Sun, C.-P.},

abstractNote = {We introduce a tight-binding chain with a single impurity to act as a quantum data bus for perfect quantum state transfer. Our proposal is based on the weak coupling limit of the two outermost quantum dots to the data bus, which is a gapped system induced by the impurity. By connecting two quantum dots to two sites of the data bus, the system can accomplish a high-fidelity and long-distance quantum state transfer. Numerical simulations for finite system show that the numerical and analytical results of the effective coupling strength agree well with each other. Moreover, we study the robustness of this quantum communication protocol in the presence of disorder in the couplings between the nearest-neighbor quantum dots. We find that the gap of the system plays an important role in robust quantum state transfer.},

doi = {10.1016/J.AOP.2014.05.025},

journal = {Annals of Physics (New York)},

issn = {0003-4916},

number = ,

volume = 348,

place = {United States},

year = {2014},

month = {9}

}