Experimental test of entropic noise-disturbance uncertainty relations for three-outcome qubit measurements
Experimental test of entropic noise-disturbance uncertainty relations for three-outcome qubit measurements
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三结果量子位测量的熵噪声-扰动不确定性关系的实验测试
DOI：
10.1103/physrevresearch.3.023175
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发表时间：
2021
影响因子：
4.2
通讯作者：
Hasegawa Yuji
中科院分区：
文献类型：
--
作者：
Sponar Stephan;Danner Armin;Pecile Vito;Einsidler Nico;Demirel B?lent;Hasegawa Yuji
信息论测不准关系用信息熵表示两个不可对易观测量的联合不可测性。在熵噪声干扰不确定性关系中体现了两个连续测量结果的准确性的权衡。最近的理论分析预测，投影测量不是最佳的，相对于噪声干扰的权衡。因此，在我们以前的文件[物理。115，030401（2015）PRLTA 00031 -900710.1103/PhysRevLett.115.030401]的性能优于一般量子测量。在这里，我们实验测试一个紧密的信息理论测量不确定性关系的三个结果的正算子值的措施，使用中子自旋量子比特。所得到的结果违反了理论预测的投影测量的下限。
Information-theoretic uncertainty relations formulate the joint immeasurability of two noncommuting observables in terms of information entropies. The tradeoff of the accuracy in the outcome of two successive measurements manifests in entropic noise-disturbance uncertainty relations. Recent theoretical analysis predicts that projective measurements are not optimal, with respect to the noise-disturbance tradeoffs. Therefore, the results in our previous paper [Phys. Rev. Lett. 115, 030401 (2015)PRLTAO0031-900710.1103/PhysRevLett.115.030401] are outperformed by general quantum measurements. Here, we experimentally test a tight information-theoretic measurement uncertainty relation for three-outcome positive-operator-valued measures, using neutron spin-qubits. The obtained results violate the lower bound for projective measurements as theoretically predicted.