1,481 research outputs found
Fourth moments reveal the negativity of the Wigner function
The presence of unique quantum correlations is the core of quantum
information processing and general quantum theory. We address the fundamental
question of how quantum correlations of a generic quantum system can be probed
using correlation functions defined for quasiprobability distributions. In
particular we discuss the possibility of probing the negativity of a
quasiprobability by comparing moments of the Wigner function. We show that one
must take at least the fourth moments to find the negativity in general and the
eighth moments for states with a rotationally invariant Wigner function.Comment: 5 pages, published versio
Teleportation of Nonclassical Wave Packets of light
We report on the experimental quantum teleportation of strongly nonclassical
wave packets of light. To perform this full quantum operation while preserving
and retrieving the fragile non-classicality of the input state, we have
developed a broadband, zero-dispersion teleportation apparatus that works in
conjunction with time-resolved state preparation equipment. Our approach brings
within experimental reach a whole new set of hybrid protocols involving
discrete- and continuous-variable techniques in quantum information processing
for optical sciences
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