Fidelity between Gaussian mixed states with quantum state quadrature variances

doi:10.1088/1674-1056/25/4/040304

中国物理B ›› 2016, Vol. 25 ›› Issue (4): 40304-040304.doi: 10.1088/1674-1056/25/4/040304

Fidelity between Gaussian mixed states with quantum state quadrature variances

Hai-Long Zhang(张海龙), Chun Zhou(周淳), Jian-Hong Shi(史建红), Wan-Su Bao(鲍皖苏)

1 Zhengzhou Information Science and Technology Institute, Zhengzhou 450004, China;
2 Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China;
3 Science and Technology on Information Assurance Laboratory, Beijing 100071, China

收稿日期:2015-04-23 修回日期:2015-11-30 出版日期:2016-04-05 发布日期:2016-04-05
通讯作者: Hai-Long Zhang E-mail:zhhl049@126.com
基金资助:
Project supported by the National Basic Research Program of China (Grant No. 2013CB338002) and the Foundation of Science and Technology on Information Assurance Laboratory (Grant No. KJ-14-001).

Fidelity between Gaussian mixed states with quantum state quadrature variances

Hai-Long Zhang(张海龙)^1,2,3, Chun Zhou(周淳)^1,2, Jian-Hong Shi(史建红)^1,2, Wan-Su Bao(鲍皖苏)^1,2

1 Zhengzhou Information Science and Technology Institute, Zhengzhou 450004, China;
2 Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China;
3 Science and Technology on Information Assurance Laboratory, Beijing 100071, China

Received:2015-04-23 Revised:2015-11-30 Online:2016-04-05 Published:2016-04-05
Contact: Hai-Long Zhang E-mail:zhhl049@126.com
Supported by:
Project supported by the National Basic Research Program of China (Grant No. 2013CB338002) and the Foundation of Science and Technology on Information Assurance Laboratory (Grant No. KJ-14-001).

摘要/Abstract

摘要： In this paper, from the original definition of fidelity in a pure state, we first give a well-defined expansion fidelity between two Gaussian mixed states. It is related to the variances of output and input states in quantum information processing. It is convenient to quantify the quantum teleportation (quantum clone) experiment since the variances of the input (output) state are measurable. Furthermore, we also give a conclusion that the fidelity of a pure input state is smaller than the fidelity of a mixed input state in the same quantum information processing.

关键词: fidelity, mixed state, quantum clone, quantum information processing

Abstract: In this paper, from the original definition of fidelity in a pure state, we first give a well-defined expansion fidelity between two Gaussian mixed states. It is related to the variances of output and input states in quantum information processing. It is convenient to quantify the quantum teleportation (quantum clone) experiment since the variances of the input (output) state are measurable. Furthermore, we also give a conclusion that the fidelity of a pure input state is smaller than the fidelity of a mixed input state in the same quantum information processing.

Key words: fidelity, mixed state, quantum clone, quantum information processing

中图分类号: (Quantum computation architectures and implementations)

03.67.Lx

03.67.Ac (Quantum algorithms, protocols, and simulations)

张海龙, 周淳, 史建红, 鲍皖苏. Fidelity between Gaussian mixed states with quantum state quadrature variances[J]. 中国物理B, 2016, 25(4): 40304-040304.

Hai-Long Zhang(张海龙), Chun Zhou(周淳), Jian-Hong Shi(史建红), Wan-Su Bao(鲍皖苏). Fidelity between Gaussian mixed states with quantum state quadrature variances[J]. Chin. Phys. B, 2016, 25(4): 40304-040304.

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Fidelity between Gaussian mixed states with quantum state quadrature variances

Fidelity between Gaussian mixed states with quantum state quadrature variances

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