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arXiv 0905.3376quant-ph
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量子不和谐对猝死的鲁棒性

Robustness of quantum discord to sudden death

T. Werlang, S. Souza, F. F. Fanchini, C. J. Villas-Boas

摘要:

我们计算了马尔可夫环境下两量子比特量子不和谐的耗散动力学。我们分析了各种耗散通道,如退相,去极化,和广义振幅阻尼,假设独立的微扰,其中每个量子位耦合到自己的通道。选择初始条件,体现了所谓的突然死亡的纠缠,我们比较纠缠的动力学与量子不和谐。我们表明,在所有的情况下,纠缠突然消失,量子不和谐只消失在渐近极限,表现类似于个人退相干的量子比特,即使在有限的温度。因此,量子不协调比纠缠对退相干的鲁棒性更强,因此仅基于量子不协调关联的量子算法可能比基于纠缠的算法更鲁棒。

英文摘要:

We calculate the dissipative dynamics of two-qubit quantum discord under Markovian environments. We analyze various dissipative channels such as dephasing, depolarizing, and generalized amplitude damping, assuming independent perturbation, in which each qubit is coupled to its own channel. Choosing initial conditions that manifest the so-called sudden death of entanglement, we compare the dynamics of entanglement with that of quantum discord. We show that in all cases where entanglement suddenly disappears, quantum discord vanishes only in the asymptotic limit, behaving similarly to individual decoherence of the qubits, even at finite temperatures. Hence, quantum discord is more robust than the entanglement against to decoherence so that quantum algorithms based only on quantum discord correlations may be more robust than those based on entanglement.

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