Quantum discord of the Werner state in noninertial frames

Using the single-mode approximation we study the quantum correlations of a free Dirac field on the Werner state in the noninertial frame. We present analytical quantum discord D and its geometric measurement D-G. We notice that the quantum discord still exists for the system rho(ARI) even in the acceleration limit. We also calculate the entanglement of formation (EOF) and the geometric measure of entanglement (E-G) to compare the behaviors of the entanglement with the quantum discord. The entanglement is nonzero for the fidelity of the Werner state with a Bell state F > 0.5, while the quantum discord is equal to zero only for F = 0.25. We also observe that the quantum discord is more robust to the change of acceleration than the entanglement, which is more sensitive to the acceleration.