Quantum langevin equation method in non-Markovian dynamics

非马尔可夫动力学中的量子朗之万方程方法

基本信息

批准号：
17F17821
负责人：
NORI FRANCO
金额：
$ 1.41万
依托单位：
Institute of Physical and Chemical Research
依托单位国家：
日本
项目类别：
Grant-in-Aid for JSPS Fellows
财政年份：
2017
资助国家：
日本
起止时间：
2017-11-10 至 2020-03-31
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17F17821/
关键词：
open quantum systems bath information harmonic oscillators thermal equilibrium nonlinear coupling two-level system wave approximation

项目摘要

In FY2019, I mainly studied the possibility of generating states with strong quantum properties in coherent Ising machine.Such devices can simulate many-body systems with quantum annealing method. However, the output states of such devices are usually classical, and there is no entanglement in the states during evolution. This limitation prevents the application to general quantum information problems. To solve this disadvantage, we study the way to generate states with strong quantum properties in these machines.We chose the entangled cat state as the target state based on three reasons. First, this state has strong quantum properties because there are both entanglement and coherent superposition in it. Second, the steady state of Ising machine can be a cat states in fine cavity limit, so that it will be more convenient to generate entanglement base on these states. Third, the detection of coherence and entanglement in an entangled cat state is easy due to its macroscopic property.Our current research has made the cat state generation clear, and now is focused on the conversion to the entangled cat state. Before generating entangled cat states, high quality cat states are necessary. Therefore, we studied the condition for cat state generating when dissipation exists. Based on the optimal parameter regimes for cat states, our research is trying to find an efficient way to achieving entangled cat states.

在2019财年，我主要研究了在连贯的ISING机器中生成具有强量子特性的状态的可能性。使用量子退火方法可以模拟多体系统。但是，此类设备的输出状态通常是经典的，并且在进化过程中没有纠缠。此限制阻止了对一般量子信息问题的应用。为了解决这一缺点，我们研究了在这些机器中具有强量子性能的状态的方法。我们根据三个原因选择了纠缠的猫状态作为目标状态。首先，该状态具有强大的量子特性，因为其中既有纠缠和相干叠加。其次，Ising机器的稳定状态可以是在良好的空腔限制下的猫状态，因此在这些状态下产生纠缠基础将更方便。第三，由于其宏观的特性，在纠缠猫状态下对连贯性和纠缠的检测很容易。我们当前的研究使猫州的一代变得清晰了，现在专注于转换为纠缠的猫州。在产生纠缠的猫状态之前，需要高质量的猫状态。因此，我们研究了存在耗散时猫状态产生的条件。基于猫州的最佳参数制度，我们的研究试图找到一种实现纠缠猫州的有效方法。