This article is cited in 12 papers

Thermal quantum discord and super quantum discord teleportation via a two-qubit spin-squeezing model

S. Ahadpour, F. Mirmasoudi

Department of Physics, University of Mohaghegh Ardabili, Ardabil, Iran

Abstract: We study thermal quantum correlations (quantum discord and super quantum discord) in a two-spin model in an external magnetic field and obtain relations between them and entanglement. We study their dependence on the magnetic field, the strength of the spin squeezing, and the temperature in detail. One interesting result is that when the entanglement suddenly disappears, quantum correlations still survive. We study thermal quantum teleportation in the framework of this model. The main goal is investigating the possibility of increasing the thermal quantum correlations of a teleported state in the presence of a magnetic field, strength of the spin squeezing, and temperature. We note that teleportation of quantum discord and super quantum discord can be realized over a larger temperature range than teleportation of entanglement. Our results show that quantum discord and super quantum discord can be a suitable measure for controlling quantum teleportation with fidelity. Moreover, the presence of entangled states is unnecessary for the exchange of quantum information.

Keywords: quantum discord, super quantum discord, entanglement, teleportation, two-spin model.

Received: 29.03.2017
Revised: 29.05.2017

DOI: 10.4213/tmf9377

 English version: Theoretical and Mathematical Physics, 2018, 195:1, 628–639

Bibliographic databases:

• 
• 
• 
• 
•