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arXiv 1210.8293eess.SYcs.SYmath.OC
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量子系统的李雅普诺夫控制及其在量子计算中的应用

Lyapunov Control of Quantum Systems with Applications to Quantum Computing

K. P. Nagarjun, S. Sivaranjani, George Koshy

AI总结:

针对量子计算中的离子阱等复杂系统,提出基于李雅普诺夫的控制方法,利用弱测量状态反馈稳定或跟踪量子态,并应用于量子谐振子和n量子比特系统。

摘要:

在设计用于量子计算的离子阱等复杂量子系统时,通常需要稳定特定的系统状态或使系统状态跟踪期望轨迹。基于反馈的几种控制理论方法似乎适合解决此类问题。但测量引入的量子系统不确定动态使得反馈控制律的综合非常复杂。尽管我们尚未明确建模测量导致的系统动态变化(我们假设了弱测量),但这是迈向更详细分析和闭环反馈设计的第一步。在此,我们提出一种基于李雅普诺夫的控制方法,遵循Mirrahimi、Rouchon、Turnici(2005)的思路。假设状态来自弱测量。李雅普诺夫控制技术迄今尚未应用于实际量子系统。我们扩展并将该技术应用于两个实际物理系统——量子谐振子和n量子比特系统。我们还提议将此概念扩展到离子阱。

英文摘要:

In the design of complex quantum systems like ion traps for quantum computing, it is usually desired to stabilize a particular system state or make the system state track a desired trajectory. Several control theoretical approaches based on feedback seem attractive to solve such problems. But the uncertain dynamics introduced by measurement on quantum systems makes the synthesis of feedback control laws very complicated. Although we have not explicitly modeled the change in system dynamics due to measurement (we have assumed weak measurements), this is a first step towards a more detailed analysis and closed-loop feedback design. Here, we present a Lyapunov-based control approach on the lines of that developed by Mirrahimi, Rouchon, Turnici (2005). The states are assumed to be obtained from weak measurements. The Lyapunov control technique has not been applied to realistic quantum systems so far. We have extended and applied the technique to two realistic physical systems - the quantum harmonic oscillator and the n-qubit system. We also propose to extend this concept to ion traps.

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。

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