非马尔科夫环境下耦合超导量子比特纠缠态的纠缠消相干

Entanglement decoherence of coupled superconductor qubits entangled states in non-Markovian environment

利用共生纠缠度比较详细地研究了超导耦合量子比特在非马尔可夫环境下纠缠消相干的演化。研究结果表明:对于不同纠缠初态下的超导耦合量子比特,由于环境作用的记忆反馈效应,处于热平衡环境中的耦合量子比特的纠缠度总是会单调地趋向于零。进一步的研究结果还表明:在非马尔可夫过程中会很快地出现纠缠的突然死亡,耗散越强,纠缠的死亡越快;而在马尔可夫过程中则是缓慢地趋向纠缠的死亡。

The evolution of entangled decoherence of coupling superconducting qubits in non-Markovian environment is investigated in detail using concurrence function. The results show that, for coupling superconducting qubit under different entangled initial states, because of the role of memory feedback due to environmental effect, the entanglement of coupling superconducting qubits under a thermal bath always tends to zero monotonically. Further results also showed that, the sudden death of entanglement will soon occur in non-Markovian process, stronger the dissipation, faster the death of entanglement. But in Markovian process, it tends to death of entanglement slowly.