Superactivation of Measurement-Induced Nonlocality

CHANG Li-Na; LUO Shun-Long

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Communications in Theoretical Physics ›› 2014, Vol. 62 ›› Issue (06) : 809-812.

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Superactivation of Measurement-Induced Nonlocality

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Abstract

Nonlocality, as an essential, subtle and intriguing aspect of nature, has many different facets and manifestations. In quantum information theory, nonlocality is usually defined, characterized and quantified in the framework of entanglement and violation of certain Bell inequalities. An exciting phenomenon concerning entanglement-related nonlocality is the superactivation, symbolized as "0+0>0", which means that two systems, while do not possess nonlocality individually by themselves, may exhibit nonlocality when combined together in an independent fashion. In this work, we explore nonlocality from the measurement perspective and reveal the superactivation of measurement-induced nonlocality (MIN): When two bipartite states with vanishing MIN are combined together, the tensorizing state may possess non-zero MIN. Implications and applications are discussed.

Key words

nonloality / measurement-induced nonlocality / quantum measurement / superactivation

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CHANG Li-Na, LUO Shun-Long. Superactivation of Measurement-Induced Nonlocality[J]. Communications in Theoretical Physics, 2014, 62(06): 809-812

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Funding

Supported by the National Natural Science Foundation of China under Grant Nos. 11375259, 61134008, and the National Center for Mathematics and Interdisciplinary Sciences, Chinese Academy of Sciences under Grant No. Y029152K51