摘要
Agenerationsystemofcontinuous-variable(CV)quadripartiteentangledstatebasedontwocascadedsecondharmonicgeneration(SHG)cavitiesbelowthethresholdisinvestigated.Tworeflectedfundamentalbeamsofthefirstcavity,thereflectedsecond-harmonicbeamandtheoutputfourth-harmonicbeamofthesecondcavityareprovedtobeentangled,andthedependenceoftheentanglementdegreeonthenormalizedfrequency,pumpparameter,fourth-harmoniclossparameter,andsecond-harmoniclossparameterisalsoanalyzed.DuetothefactthatthecavityparametersandthenonlinearcrystalsofthetwoSHGcavitiescanbefreelychosen,thepracticalityoftheproposedprotocolisrelativelyperfectandthesystemcanalsobeextendedtothepreparationofmulticolorentangledstatesforaquantumnetwork.
出版日期
2014年04月14日（中国期刊网平台首次上网日期，不代表论文的发表时间）
