J4 ›› 2015, Vol. 32 ›› Issue (5): 573-580.

• Quantum Optics • Previous Articles     Next Articles

Geometric Quantum Discord and Dense Coding in the Superconducting Charge Qubit System

Wang Fei, Maimaitiyiming Tusun, Aziguli Reheman,Ablimit Ablez,Parouke Paerhati, Ahmad Abliz   

  1. School of Physics and Electronic Engineering, Xinjiang Normal University, Urumchi 830054, China
  • Received:2014-12-05 Revised:2015-01-19 Published:2015-09-28 Online:2015-09-28

Abstract:

Geometric quantum discord as well as dense coding capacity are studied in a model where two superconducting charge qubits are coupled with a large Josephson junction. The influence of the initial mean photon number, the relative phase and the amplitude of the two qubits on the time evolution of geometric quantum discord and the dense coding capacity is studied. The results show that the initial mean photon number, the relative phase and the amplitude of the two qubits may play an important role in the evolution of geometric quantum discord and the dense coding capacity. Importantly, the dense coding channel capacity can be increased via changing the relative phases.

Key words: superconducting charge qubit, geometric quantum discord, quantum dense coding, channel capacity

CLC Number: