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

• Authors: Ai-Xi Chen , Jian-Song Zhang
• Languages of publication: EN

Abstracts

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.

Keywords

EN

dephasing; spin chain; phase shift

• Publisher: De Gruyter Open
• Journal: Open Physics
• Year: 2015
• Volume: 13
• Issue: 1

Dates

received

22 - 9 - 2014

accepted

23 - 3 - 2015

online

28 - 4 - 2015

Contributors

author

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

author

Jian-Song Zhang

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

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Identifiers

DOI

10.1515/phys-2015-0025