用II型普度量下转换产生{ \it a priori}纯纠缠态
Producing the {\it a priori} pure entangled states by type II prametric downconversion
摘要：
我们提出了一个通过II型下转换产生纯纠缠态的方案。在该方案中，真空态被排除在外，在不破坏纠缠态本身的情况下，产生并验证了先验的纯纠缠态。这将有助于开展许多与量子纠缠相关的非线性实验。
英文摘要：
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.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
