arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1109.2677quant-ph
收藏

开放量子系统从马尔可夫到非马尔可夫动力学转变的实验控制

Experimental control of the transition from Markovian to non-Markovian dynamics of open quantum systems

Bi-Heng Liu, Li Li, Yun-Feng Huang, Chuan-Feng Li, Guang-Can Guo, Elsi-Mari Laine, Heinz-Peter Breuer, Jyrki Piilo

摘要:

现实的量子力学系统总是暴露在外部环境中。环境的存在往往会引起一个马尔可夫过程,在这个过程中,系统会将信息丢失给周围的环境。然而,许多量子系统表现出明显的非马尔可夫行为,其中存在从环境返回到系统的信息流,这意味着量子记忆效应的存在[1-5]。环境通常由大量难以控制的自由度组成,但是已经开发了一些用于修改环境的复杂方案[6]。开放量子系统中动力学过程的物理实现和控制起着决定性的作用,例如,在最近关于纠缠态的产生[7-9]、耗散量子计算方案[10]、量子存储器的设计[11]和提高量子精密测量效率[12]的建议中。在这里,我们报告了一个实验,允许通过选择性地准备的初始环境状态,以驱动开放系统从马尔可夫制度的非马尔可夫制度,控制系统和环境之间的信息流,并确定程度的非马尔可夫直接测量开放系统。

英文摘要:

Realistic quantum mechanical systems are always exposed to an external environment. The presence of the environment often gives rise to a Markovian process in which the system loses information to its surroundings. However, many quantum systems exhibit a pronounced non-Markovian behavior in which there is a flow of information from the environment back to the system, signifying the presence of quantum memory effects [1-5]. The environment is usually composed of a large number of degrees of freedom which are difficult to control, but some sophisticated schemes for modifying the environment have been developed [6]. The physical realization and control of dynamical processes in open quantum systems plays a decisive role, for example, in recent proposals for the generation of entangled states [7-9], for schemes of dissipative quantum computation [10], for the design of quantum memories [11] and for the enhancement of the efficiency in quantum metrology [12]. Here we report an experiment which allows through selective preparation of the initial environmental states to drive the open system from the Markovian to the non-Markovian regime, to control the information flow between the system and the environment, and to determine the degree of non-Markovianity by direct measurements on the open system.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑