中国物理B ›› 2019, Vol. 28 ›› Issue (7): 70301-070301.doi: 10.1088/1674-1056/28/7/070301

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

Tetrapartite entanglement measures of W-class in noninertial frames

Ariadna J. Torres-Arenas, Edgar O. López-Zúñiga, J. Antonio Saldaña-Herrera, Qian Dong, Guo-Hua Sun, Shi-Hai Dong   

  1. 1 Laboratorio de Información Cuántica, CIDETEC, Instituto Politécnico Nacional, UPALM, CDMX 07700, Mexico;
    2 Facultad de Ciencias Físico Matemáticas, Universidad Autónoma de Nuevo León, San Nicolás de los Garza NL, 66450, Mexico;
    3 Catedrática CONACyT, Centro de Investigación en Computación, Instituto Politécnico Nacional, UPALM, CDMX 07738, Mexico
  • 收稿日期:2019-03-27 修回日期:2019-04-17 出版日期:2019-07-05 发布日期:2019-07-05
  • 通讯作者: Shi-Hai Dong E-mail:dongsh2@yahoo.com
  • 基金资助:

    Project partially supported by the CONACYT, Mexico under the Grant No. 288856-CB-2016, partially by 20190234-SIP-IPN, Mexico, and partially by the program XXVIII Verano de la Investigación Científica 2018 supported by the Academia Mexicana de Ciencias.

Tetrapartite entanglement measures of W-class in noninertial frames

Ariadna J. Torres-Arenas1, Edgar O. López-Zúñiga1,2, J. Antonio Saldaña-Herrera1,2, Qian Dong1, Guo-Hua Sun3, Shi-Hai Dong1   

  1. 1 Laboratorio de Información Cuántica, CIDETEC, Instituto Politécnico Nacional, UPALM, CDMX 07700, Mexico;
    2 Facultad de Ciencias Físico Matemáticas, Universidad Autónoma de Nuevo León, San Nicolás de los Garza NL, 66450, Mexico;
    3 Catedrática CONACyT, Centro de Investigación en Computación, Instituto Politécnico Nacional, UPALM, CDMX 07738, Mexico
  • Received:2019-03-27 Revised:2019-04-17 Online:2019-07-05 Published:2019-07-05
  • Contact: Shi-Hai Dong E-mail:dongsh2@yahoo.com
  • Supported by:

    Project partially supported by the CONACYT, Mexico under the Grant No. 288856-CB-2016, partially by 20190234-SIP-IPN, Mexico, and partially by the program XXVIII Verano de la Investigación Científica 2018 supported by the Academia Mexicana de Ciencias.

摘要:

We present the entanglement measures of a tetrapartite W-class entangled system in a noninertial frame, where the transformation between Minkowski and Rindler coordinates is applied. Two cases are considered. First, when one qubit has uniform acceleration whilst the other three remain stationary. Second, when two qubits have nonuniform accelerations and the others stay inertial. The 1-1 tangle, 1-3 tangle, and whole entanglement measurements π4 and Π4, are studied and illustrated with graphics through their dependence on the acceleration parameter rd for the first case and rc and rd for the second case. It is found that the negativities (1-1 tangle and 1-3 tangle) and π-tangle decrease when the acceleration parameter rd or in the second case rc and rd increase, remaining a nonzero entanglement in the majority of the results. This means that the system will be always entangled except for special cases. It is shown that only the 1-1 tangle for the first case vanishes at infinite accelerations, but for the second case the 1-1 tangle disappears completely when r>0.472473. An analytical expression for the von Neumann information entropy of the system is found and we note that it increases with the acceleration parameter.

关键词: W-class, tetrapartite entanglement, Dirac field, noninertial frames, nonuniform acceleration

Abstract:

We present the entanglement measures of a tetrapartite W-class entangled system in a noninertial frame, where the transformation between Minkowski and Rindler coordinates is applied. Two cases are considered. First, when one qubit has uniform acceleration whilst the other three remain stationary. Second, when two qubits have nonuniform accelerations and the others stay inertial. The 1-1 tangle, 1-3 tangle, and whole entanglement measurements π4 and Π4, are studied and illustrated with graphics through their dependence on the acceleration parameter rd for the first case and rc and rd for the second case. It is found that the negativities (1-1 tangle and 1-3 tangle) and π-tangle decrease when the acceleration parameter rd or in the second case rc and rd increase, remaining a nonzero entanglement in the majority of the results. This means that the system will be always entangled except for special cases. It is shown that only the 1-1 tangle for the first case vanishes at infinite accelerations, but for the second case the 1-1 tangle disappears completely when r>0.472473. An analytical expression for the von Neumann information entropy of the system is found and we note that it increases with the acceleration parameter.

Key words: W-class, tetrapartite entanglement, Dirac field, noninertial frames, nonuniform acceleration

中图分类号:  (Quantum information)

  • 03.67.-a
03.67.Mn (Entanglement measures, witnesses, and other characterizations) 03.65.Ud (Entanglement and quantum nonlocality) 04.70.Dy (Quantum aspects of black holes, evaporation, thermodynamics)