测量未知时的量子态估计
Quantum state estimation with unknown measurements
摘要：
改进的测量技术是技术发展和基础科学探索的核心。量子光学依赖于对光的非经典特征敏感的探测器，从而能够精确测试物理定律和量子增强技术，如精确测量和安全通信。准确的检测器响应校准的量子尺度输入是关键，未来的研究和发展，在这些同源领域。为了解决这一要求，最近引入了量子探测器断层扫描（QDT）。然而，随着检测器响应和输入空间的复杂性增加，QDT方法变得越来越具有挑战性。在这里，我们提出了一个多功能的替代表征技术的第一个实验实施，以解决多结果量子探测器通过限制输入校准区域。为了证明这种方法的适用性，校准后的探测器随后被用来估计非经典光子数状态。
英文摘要：
Improved measurement techniques are central to technological development and foundational scientific exploration. Quantum optics relies upon detectors sensitive to non-classical features of light, enabling precise tests of physical laws and quantum-enhanced technologies such as precision measurement and secure communications. Accurate detector response calibration for quantum-scale inputs is key to future research and development in these cognate areas. To address this requirement quantum detector tomography (QDT) has been recently introduced. However, the QDT approach becomes increasingly challenging as the complexity of the detector response and input space grows. Here we present the first experimental implementation of a versatile alternative characterization technique to address many-outcome quantum detectors by limiting the input calibration region. To demonstrate the applicability of this approach the calibrated detector is subsequently used to estimate non-classical photon number states.
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