Effects of phase shift on bipartite and multipartite correlations of a spin chain under dephasing

• Autorzy: Ai-Xi Chen , Jian-Song Zhang
• Języki publikacji: EN

Abstrakty

EN

We investigate the effects of phase shift on entanglement, quantum discord, geometric discord, and spinsqueezing of a Heisenberg chain under dephasing. An analytical solution of the present model is obtained. Our results show that the initial correlations of the spin chain could be partially stored for a long time in the presence of dephasing and the amount of steady state correlations can be adjusted via phase shift. Particularly, we find the effects of phase shift on quantum discord and geometric discord are not always the same, i.e., the increase of geometric discord does not always imply the increase of quantum discord. Then, we calculate the spin-squeezing of the spin chain and find that spin-squeezing first increases with time and then reaches a plateau. The amount of spin-squeezing can be controlled via phase shift.

Słowa kluczowe

EN

dephasing; spin chain; phase shift

• Czasopismo: Open Physics
• Rocznik: 2015
• Tom: 13
• Numer: 1

Daty

otrzymano

2014-09-22

zaakceptowano

2015-03-23

online

2015-04-28

Twórcy

autor

Ai-Xi Chen

• Department of Applied
  Physics, East China Jiaotong University, Nanchang 330013, People’s
  Republic of China
• Institute for Quantum Computing,
  University of Waterloo, Ontario N2L 3G1, Canada

autor

Jian-Song Zhang

• Department of Applied
  Physics, East China Jiaotong University, Nanchang 330013, People’s
  Republic of China

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Identyfikatory

DOI

10.1515/phys-2015-0025