Optimal dense coding with arbitrary pure entangled states (5 pages)

Jonathan Oppenheim, Shay Mozes

Liang Qiu, An Min Wang, XIAO SAN MA

Hailin Huang

Yuan Feng, Runyao Duan, Zhengfeng Ji

We examine dense coding with an arbitrary pure entangled state sharing between the sender and the receiver. Upper bounds on the average success probability in approximate dense coding and on the probability of conclusive results in unambiguous dense coding are derived. We also construct the optimal protocol which saturates the upper bound in each case.

Hai Lin Huang, Zhao‐Yu Sun

The effect of arbitrary orientation in the magnetic field on the entanglement and dense coding of a two-qubit XX model is investigated. The concurrence and optimal dense coding capacity are calculated for different orientations of the magnetic field. It is found that the entanglement can be maximized by rotating the magnetic field to an optimal direction at given temperature. Furthermore, there exists critical concurrence Cc, beyond which the thermal state is unfeasible for optimal dense coding.

Garry Bowen