Instituto de Física "Gleb Wataghin", Universidade Estadual de Campinas, Unicamp, 13083-970, Campinas, São Paulo, Brazil.
Departamento de Física, Universidad de Sucre, Cra 28 No 5-267 Puerta Roja, Sincelejo, Sucre, Colombia.
Sci Rep. 2017 Aug 30;7(1):9957. doi: 10.1038/s41598-017-09989-2.
Dynamical control of entanglement and its connection with the classical concept of instability is an intriguing matter which deserves accurate investigation for its important role in information processing, cryptography and quantum computing. Here we consider a tripartite quantum system made of three coupled quantum parametric oscillators in equilibrium with a common heat bath. The introduced parametrization consists of a pulse train with adjustable amplitude and duty cycle representing a more general case for the perturbation. From the experimental observation of the instability in the classical system we are able to predict the parameter values for which the entangled states exist. A different amount of entanglement and different onset times emerge when comparing two and three quantum oscillators. The system and the parametrization considered here open new perspectives for manipulating quantum features at high temperatures.
纠缠的动力学控制及其与经典不稳定性概念的联系是一个有趣的问题，值得对其在信息处理、密码学和量子计算中的重要作用进行准确研究。在这里，我们考虑一个由三个耦合的量子参量振荡器组成的三方量子系统，与一个公共热浴处于平衡状态。引入的参数化由一个可调振幅和占空比的脉冲串组成，代表了更一般的微扰情况。从对经典系统中不稳定性的实验观察中，我们能够预测出存在纠缠态的参数值。当比较两个和三个量子振荡器时，会出现不同数量的纠缠和不同的起始时间。这里考虑的系统和参数化为在高温下操纵量子特性开辟了新的前景。
