1203.3356 (Wei Song et al.)

Conditions for the freezing phenomena of geometric measure of quantum
discord for arbitrary two-qubit X states under non-dissipative dephasing
noises    [PDF]

Wei Song, Long-Bao Yu, Da-Chuang Li, Ping Dong, Ming Yang, Zhuo-Liang Cao

We study the dynamics of geometric measure of quantum discord (GMQD) under the influences of two local phase damping noises. Consider the two qubits initially in arbitrary X states, we find the necessary and sufficient conditions for which GMQD are unaffected for a finite period. It is further shown that such results also hold for the non-Markovian dephasing process.

View original: http://arxiv.org/abs/1203.3356