Zhang Haiyang, Han Xiaoxiang, Zhang Guoqing, Li Lianbi, Cheng Lin, Wang Jun, Zhang Yunjie, Xia Yanwen, Xia Caijuan
School of Science, Xi'an Polytechnic University, No. 19 Jinhua South Road, Xi'an, 710048, Shaanxi, China.
Engineering Research Center of Flexible Radiation Protection Technology, Universities of Shaanxi Province, Xi'an Polytechnic University, Xi'an, 710048, Shaanxi, China.
Sci Rep. 2024 Oct 12;14(1):23885. doi: 10.1038/s41598-024-74702-z.
Maintaining quantum coherence and entanglement in the presence of environmental noise, particularly within non-Markovian contexts, represents a significant challenge for the progression of quantum information science and technology. This study offers a substantial advancement by investigating the dynamics of a two-qubit system subjected to diverse noise conditions, encompassing relaxation, dephasing, and their cumulative effects. By employing quantum-state-diffusion equations specifically crafted for non-Markovian environments, we introduce an innovative strategy to counteract the detrimental influences of environmental noise on quantum teleportation fidelity and entanglement concurrence. Our results underscore the potential for external interventions to markedly improve the resilience of quantum information processing tasks over prolonged durations, especially in settings where dephasing noise prevails. A key revelation is the intricate relationship between dephasing noise and the initial state of entanglement, which profoundly impacts the occurrence of entanglement sudden death. This research not only deepens our comprehension of quantum system dynamics under noisy circumstances but also furnishes practical directives for engineering robust quantum systems, a necessity for the development of scalable quantum technologies.
在存在环境噪声的情况下，特别是在非马尔可夫环境中维持量子相干性和纠缠，对量子信息科学与技术的发展构成了重大挑战。本研究通过研究两量子比特系统在包括弛豫、退相及其累积效应等各种噪声条件下的动力学，取得了重大进展。通过采用专门为非马尔可夫环境设计的量子态扩散方程，我们引入了一种创新策略，以抵消环境噪声对量子隐形传态保真度和纠缠并发度的不利影响。我们的结果强调了外部干预在长时间内显著提高量子信息处理任务恢复力的潜力，特别是在退相噪声占主导的情况下。一个关键发现是退相噪声与纠缠初始状态之间的复杂关系，这对纠缠突然死亡的发生有深远影响。这项研究不仅加深了我们对噪声环境下量子系统动力学的理解，还为构建稳健的量子系统提供了实用指导，这是可扩展量子技术发展的必要条件。
