Unveiling the decoherence effect of noise on the entropic uncertainty relation and its control by partially collapsed operations

• Published in: Laser physics letters 2018-01, Vol.15 (1), p.15207
• Main Authors: Chen, Min-Nan, Sun, Wen-Yang, Huang, Ai-Jun, Ming, Fei, Wang, Dong, Ye, Liu
• Format: Article
• Language: English
• Subjects: decoherence; entropic uncertainty; quantum correlation; weak measurement
• ISSN: 1612-2011; 1612-202X
• DOI: 10.1088/1612-202X/aa877d

In this work, we investigate the dynamics of quantum-memory-assisted entropic uncertainty relations under open systems, and how to steer the uncertainty under different types of decoherence. Specifically, we develop the dynamical behaviors of the uncertainty of interest under two typical categories of noise; bit flipping and depolarizing channels. It has been shown that the measurement uncertainty firstly increases and then decreases with the growth of the decoherence strength in bit flipping channels. In contrast, the uncertainty monotonically increases with the increase of the decoherence strength in depolarizing channels. Notably, and to a large degree, it is shown that the uncertainty depends on both the systematic quantum correlation and the minimal conditional entropy of the observed subsystem. Moreover, we present a possible physical interpretation for these distinctive behaviors of the uncertainty within such scenarios. Furthermore, we propose a simple and effective strategy to reduce the entropic uncertainty by means of a partially collapsed operation-quantum weak measurement. Therefore, our investigations might offer an insight into the dynamics of the measurment uncertainty under decoherence, and be of importance to quantum precision measurement in open systems.