Physics – Quantum Physics
Scientific paper
2010-12-02
Nature Physics 7, 752-756 (2011)
Physics
Quantum Physics
14 pages, 5 figures
Scientific paper
10.1038/nphys2047
The uncertainty principle, which bounds the uncertainties involved in obtaining precise outcomes for two complementary variables defining a quantum particle, is a crucial aspect in quantum mechanics. Recently, the uncertainty principle in terms of entropy has been extended to the case involving quantum entanglement. With previously obtained quantum information for the particle of interest, the outcomes of both non-commuting observables can be predicted precisely, which greatly generalises the uncertainty relation. Here, we experimentally investigated the entanglement-assisted entropic uncertainty principle for an entirely optical setup. The uncertainty is shown to be near zero in the presence of quasi-maximal entanglement. The new uncertainty relation is further used to witness entanglement. The verified entropic uncertainty relation provides an intriguing perspective in that it implies the uncertainty principle is not only observable-dependent but is also observer-dependent.
Guo Guang-Can
Li Chuan-Feng
Li Ke
Xu Jin-Shi
Xu Xiao-Ye
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