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Multiphoton entanglement and interferometry
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DOI：10.1002/prop.200310039.png)
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Multiphoton entanglement is the basis of many quantum communication schemes, quantum cryptographic protocols, and fundamental tests of quantum theory. Spontaneous parametric down-conversion is the most effective source for polarization entangled photon pairs. Here we show, that a class of entangled 4-photon states can be directly created by parametric down-conversion. These states exhibit perfect quantum correlations and a high robustness of entanglement against photon loss. Therefore these states are well suited for new types of quantum communication.
Keyword:
QUANTUM CRYPTOGRAPHY
ENTANGLING PHOTONS
STATE
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