论文标题
基于连贯和测量的量子反馈的统一碰撞模型
Unified Collision Model of Coherent and Measurement-based Quantum Feedback
论文作者
论文摘要
我们基于碰撞模型和离散的CP-MAP引入了一个通用框架，以对基于量子机械系统的基于相等和测量的反馈控制进行描述。我们将框架应用于量子控制的重要任务，从冷却到哈密顿控制。与其他提出的比较不同，连贯的反馈总是证明是优越的，我们发现，根据手头的任务，对控制器的测量值或相干操作可能是有利的。基于测量的反馈通常在冷却方面优越，而相干反馈更好地协助量子操作。此外，我们表明，基于测量和测量的反馈循环允许一个人模拟任意的哈密顿发展，并在这方面讨论了它们各自的有效性。
We introduce a general framework, based on collision models and discrete CP-maps, to describe on an equal footing coherent and measurement-based feedback control of quantum mechanical systems. We apply our framework to prominent tasks in quantum control, ranging from cooling to Hamiltonian control. Unlike other proposed comparisons, where coherent feedback always proves superior, we find that either measurements or coherent manipulations of the controller can be advantageous depending on the task at hand. Measurement-based feedback is typically superior in cooling, whilst coherent feedback is better at assisting quantum operations. Furthermore, we show that both coherent and measurement-based feedback loops allow one to simulate arbitrary Hamiltonian evolutions, and discuss their respective effectiveness in this regard.
