中国物理B ›› 2019, Vol. 28 ›› Issue (10): 100302-100302.doi: 10.1088/1674-1056/ab3e67

• SPECIAL TOPIC—Recent advances in thermoelectric materials and devices • 上一篇    下一篇

Boundary states for entanglement robustness under dephasing and bit flip channels

Hong-Mei Li(李红梅), Miao-Di Guo(郭苗迪), Rui Zhang(张锐), Xue-Mei Su(苏雪梅)   

  1. College of Physics, Jilin University, Changchun 130012, China
  • 收稿日期:2019-05-16 修回日期:2019-08-13 出版日期:2019-10-05 发布日期:2019-10-05
  • 通讯作者: Xue-Mei Su E-mail:suxm@jlu.edu.cn
  • 基金资助:

    Project supported by the National Key Research and Development Program of China (Grant No. 2016YFE0200700) and the National Natural Science Foundation of China (Grant Nos. 61627820 and 61934003).

Boundary states for entanglement robustness under dephasing and bit flip channels

Hong-Mei Li(李红梅), Miao-Di Guo(郭苗迪), Rui Zhang(张锐), Xue-Mei Su(苏雪梅)   

  1. College of Physics, Jilin University, Changchun 130012, China
  • Received:2019-05-16 Revised:2019-08-13 Online:2019-10-05 Published:2019-10-05
  • Contact: Xue-Mei Su E-mail:suxm@jlu.edu.cn
  • Supported by:

    Project supported by the National Key Research and Development Program of China (Grant No. 2016YFE0200700) and the National Natural Science Foundation of China (Grant Nos. 61627820 and 61934003).

摘要:

We investigate the robustness of entanglement for a multiqubit system under dephasing and bit flip channels. We exhibit the difference between the entanglement evolution of the two forms of special states, which are locally unitarily equivalent to each other and therefore possess precisely the same entanglement properties, and demonstrate that the difference increases with the number of qubits n. Moreover, those two forms of states are either the most robust genuine entangled states or the most fragile ones, which confirm that local unitary (LU) operations can greatly enhance the entanglement robustness of n-qubit states.

关键词: entanglement, decoherence, robustness, local unitary equivalence

Abstract:

We investigate the robustness of entanglement for a multiqubit system under dephasing and bit flip channels. We exhibit the difference between the entanglement evolution of the two forms of special states, which are locally unitarily equivalent to each other and therefore possess precisely the same entanglement properties, and demonstrate that the difference increases with the number of qubits n. Moreover, those two forms of states are either the most robust genuine entangled states or the most fragile ones, which confirm that local unitary (LU) operations can greatly enhance the entanglement robustness of n-qubit states.

Key words: entanglement, decoherence, robustness, local unitary equivalence

中图分类号:  (Decoherence; open systems; quantum statistical methods)

  • 03.65.Yz
03.65.Ta (Foundations of quantum mechanics; measurement theory) 03.65.Ud (Entanglement and quantum nonlocality)