Physics – Quantum Physics
Scientific paper
2010-05-25
Phys. Rev. A 82, 042328 (2010)
Physics
Quantum Physics
extended revision, accepted for publication in Physical Review A
Scientific paper
We experimentally investigate the dynamics of classical and quantum correlations of a Bell diagonal state in a non-Markovian dephasing environment. The sudden transition from classical to quantum decoherence regime is observed during the dynamics of such kind of Bell diagonal state. Due to the refocusing effect of the overall relative phase, the quantum correlation revives from near zero and then decays again in the subsequent evolution. However, the non-Markovian effect is too weak to revive the classical correlation, which remains constant in the same evolution range. With the implementation of an optical $\sigma_{x}$ operation, the sudden transition from quantum to classical revival regime is obtained and correlation echoes are formed. Our method can be used to control the revival time of correlations, which would be important in quantum memory.
Guo Guang-Can
Li Chuan-Feng
Xu Jin-Shi
Xu Xiao-Ye
Zhang Cheng-Jie
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