Laser Physics ( IF 1.2 ) Pub Date : 2020-12-15 , DOI: 10.1088/1555-6611/abca34 Qi-Wen He 1, 2 , Zhi He 1, 2 , Yu Chen 3
We investigate the protection of the quantum discord of two qubits, individually originated by two generalized amplitude-damping models. Here, each generalized amplitude-damping model consists of N non-interacting qubits interacting with a common zero-temperature reservoir. First, for initial states with extended Werner-like states, we find that the robust quantum discord of two qubits against decoherence can be obtained by controlling the number of qubits in the reservoir. More interestingly, we find that a quantum beat for quantum discord can occur when both the number of qubits in each reservoir is large and when the number of qubits have a tiny difference, even in the resonant case. Our results shed new light on the protection of quantum discord by means of a quantum-reservoir engineering approach in quantum-information processing.
中文翻译:
非马尔可夫环境中量子位引起的量子不和谐的量子拍
我们研究了两个量子位的量子不和谐的保护,这是由两个广义的振幅阻尼模型分别产生的。在此,每个广义振幅阻尼模型都由N个组成 非相互作用的量子位与普通的零温度储层相互作用。首先,对于具有扩展的Werner类状态的初始状态,我们发现可以通过控制储层中的量子位数目来获得两个量子位对退相干的鲁棒量子不和。更有趣的是,我们发现,当每个存储库中的量子位数都很大时,即使在共振情况下,量子位数也有微小差异时,也会发生量子不和谐的量子拍。我们的研究结果为在量子信息处理中通过量子储库工程方法保护量子不和谐提供了新的思路。