期刊
NATURE PHYSICS
卷 7, 期 10, 页码 757-761出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/nphys2048
关键词
-
资金
- Ontario Ministry of Research and Innovation ERA
- QuantumWorks
- NSERC
- OCE
- Industry Canada
- CFI
- MRI
- Austrian Science Fund (FWF)
Heisenberg's uncertainty principle(1) provides a fundamental limitation on the ability of an observer holding classical information to predict the outcome when one of two measurements is performed on a quantum system. However, an observer with access to a particle (stored in a quantum memory) which is entangled with the system generally has a reduced uncertainty: indeed, if the particle and system are maximally entangled, the observer can perfectly predict the outcome of whichever measurement is chosen. This effect has recently been quantified(2) in a new entropic uncertainty relation. Here we experimentally investigate this relation, showing its effectiveness as an efficient entanglement witness. We use entangled photon pairs, an optical delay line serving as a simple quantum memory and fast, active feed-forward. Our results quantitatively agree with the new uncertainty relation. Our technique acts as a witness for almost all entangled states in our experiment as we obtain lower uncertainties than would be possible without the entangled particle(3-5).
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据