Quantum discrimination and estimation are pivotal for many quantum technologies, and their performance depends on the optimal choice of probe state and measurement. Here we show that their performance can be further improved by suitably tailoring the pulses that make up the interferometer. Developing an optimal control framework and applying it to the discrimination and estimation of a magnetic field in the presence of noise, we find an increase in the overall achievable state distinguishability. Moreover, the maximum distinguishability can be stabilized for times that are more than an order of magnitude longer than the decoherence time.

中文翻译：

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最优控制的量子判别和估计

量子判别和估计对于许多量子技术至关重要，其性能取决于探针状态和测量的最佳选择。在这里，我们表明，通过适当调整构成干涉仪的脉冲，可以进一步提高其性能。开发最佳控制框架并将其应用于存在噪声的磁场的判别和估计中，我们发现总体上可实现的状态可分辨性有所提高。而且，最大可分辨性可以稳定在比退相干时间长一个数量级以上的时间内。