Experimental Quantification of Coherence of a Tunable Quantum Detector.,Physical Review Letters

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Experimental Quantification of Coherence of a Tunable Quantum Detector.
Physical Review Letters ( IF 8.1 ) Pub Date : 2020-08-05 , DOI: 10.1103/physrevlett.125.060404
Huichao Xu ₁ , Feixiang Xu ₁ , Thomas Theurer ₂ , Dario Egloff _{2,

3} , Zi-Wen Liu _{4,

5} , Nengkun Yu ₆ , Martin B Plenio ₂ , Lijian Zhang ₁

Affiliation

Quantum coherence is a fundamental resource that quantum technologies exploit to achieve performance beyond that of classical devices. A necessary prerequisite to achieve this advantage is the ability of measurement devices to detect coherence from the measurement statistics. Based on a recently developed resource theory of quantum operations, here we quantify experimentally the ability of a typical quantum-optical detector, the weak-field homodyne detector, to detect coherence. We derive an improved algorithm for quantum detector tomography and apply it to reconstruct the positive-operator-valued measures of the detector in different configurations. The reconstructed positive-operator-valued measures are then employed to evaluate how well the detector can detect coherence using two computable measures. As the first experimental investigation of quantum measurements from a resource theoretical perspective, our work sheds new light on the rigorous evaluation of the performance of a quantum measurement apparatus.

中文翻译：

可调谐量子检测器相干性的实验量化。

量子相干性是量子技术用来获得超越传统设备性能的基本资源。实现此优势的必要先决条件是测量设备具有从测量统计数据中检测相干性的能力。基于最近开发的量子运算资源理论，在这里我们通过实验来量化典型的量子光学探测器，弱场零差探测器探测相干性的能力。我们导出了一种用于量子探测器层析成像的改进算法，并将其应用于在不同配置下重构探测器的正算子值度量。然后采用重构的正算子值度量，使用两个可计算的度量来评估检测器检测相干性的程度。

更新日期：2020-08-06

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