Producing the a priori pure entangled states by type II prametric downconversion
Wang Xiang-Bin
Abstract
We propose a scheme to produce the pure entangled states through type II downconversion. In the scheme, the vacuum states are excluded and the a prori pure entangled states are produced and verified without destroying the state itself. This can help to carry out the many unditional experiments related to quantum entanglement.
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