论文标题
耗散绝热测量：击败量子cramér-rao绑定
Dissipative Adiabatic Measurements: Beating the Quantum Cramér-Rao Bound
论文作者
论文摘要
直到最近，在物理参数的任何测量中都可以实现的精度在根本上受到量子cramér-rao结合（QCRB）的限制。在这里，针对强烈耗散系统中的参数的靶向，我们提出了一种创新的测量方案，称为{\ IT耗散绝热测量}，理论上表明它可以击败QCRB。与投影测量值不同，我们的测量方案虽然消耗了更多的时间，但并不会折叠测得的状态，更重要的是，可观察到的可观察到的预期值作为其测量结果，这与感兴趣的参数直接相关。这样的直接连接{允许以直接的方式从测量结果中提取}参数的值，而原则上没有基本限制。我们的发现不仅提供了对量子计量学的明显见解，而且在耗散量子信息处理中非常有用。
It is challenged only recently that the precision attainable in any measurement of a physical parameter is fundamentally limited by the quantum Cramér-Rao Bound (QCRB). Here, targeting at measuring parameters in strongly dissipative systems, we propose an innovative measurement scheme called {\it dissipative adiabatic measurement} and theoretically show that it can beat the QCRB. Unlike projective measurements, our measurement scheme, though consuming more time, does not collapse the measured state and, more importantly, yields the expectation value of an observable as its measurement outcome, which is directly connected to the parameter of interest. Such a direct connection {allows to extract} the value of the parameter from the measurement outcomes in a straightforward manner, with no fundamental limitation on precision in principle. Our findings not only provide a marked insight into quantum metrology but also are highly useful in dissipative quantum information processing.
