Physics – Quantum Physics
Scientific paper
2004-02-05
PHYSICAL REVIEW A 71, 012304 (2005)
Physics
Quantum Physics
4 pages, 4 figures, submitted to Phys. Rev. A
Scientific paper
10.1103/PhysRevA.71.012304
We have experimentally realized the scheme initially proposed as quantum dense coding with continuous variables [Ban, J. Opt. B \textbf{1}, L9 (1999), and Braunstein and Kimble, \pra\textbf{61}, 042302 (2000)]. In our experiment, a pair of EPR (Einstein-Podolski-Rosen) beams is generated from two independent squeezed vacua. After adding two-quadrature signal to one of the EPR beams, two squeezed beams that contain the signal were recovered. Although our squeezing level is not sufficient to demonstrate the channel capacity gain over the Holevo limit of a single-mode channel without entanglement, our channel is superior to conventional channels such as coherent and squeezing channels. In addition, optical addition and subtraction processes demonstrated are elementary operations of universal quantum information processing on continuous variables.
Furusawa Akira
Mizuno Jun
Sasaki Masahide
Wakui Kentaro
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