Physics – Quantum Physics
Scientific paper
2006-07-26
Phys. Rev. A 74, 052311 (2006)
Physics
Quantum Physics
REVTEX 4.0, 4 pages, 4 figures, 1 table
Scientific paper
10.1103/PhysRevA.74.052311
We obtain a four-photon polarization-entangled state with a visibility as high as (95.35\pm 0.45)% directly from a single down-conversion source. A success probability of (81.54\pm 1.38)% is observed by applying this entangled state to realize a four-party quantum communication complexity scenario (QCCS), which comfortably surpass the classical limit of 50%. As a comparison, two Einstein-Podolsky-Rosen (EPR) pairs are shown to implement the scenario with a success probability of (73.89\pm 1.33)%. This four-photon state can be used to fulfill decoherence-free quantum information processing and other advanced quantum communication schemes.
Guo Guang-Can
Li Chuan-Feng
Xu Jin-Shi
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