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arXiv 2005.13410quant-ph
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三结果量子比特测量的熵噪声-扰动不确定度关系的实验检验

Experimental Test of Entropic Noise-Disturbance Uncertainty Relations for Three-Outcome Qubit Measurements

Stephan Sponar, Armin Danner, Vito Pecile, Nico Einsidler, Buelent Demirel, Yuji Hasegawa

摘要:

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,我们上一封信[PRL 115,030401(2015)]中的结果优于一般量子测量。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(POVM),使用中子自旋1/2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。

英文摘要:

Information-theoretic uncertainty relations formulate the joint immeasurability of two non-commuting observables in terms of information entropies. The trade-off 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 trade-offs. Therefore the results in our previous letter [PRL 115, 030401 (2015)] are outperformed by general quantum measurements. Here, we experimentally test a tight information-theoretic measurement uncertainty relation for three-outcome positive-operator valued measures (POVM), using neutron spin-1/2 qubits. The obtained results violate the lower bound for projective measurements as theoretically predicted.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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