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《PRL.111, 073601 (2013)Vacuum-Assisted Generation and Control of Atomic Coherences at X-Ray Energies》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。
1、weekendingPRL111,073601(2013)PHYSICALREVIEWLETTERS16AUGUST2013Vacuum-AssistedGenerationandControlofAtomicCoherencesatX-RayEnergies122223,4KilianP.Heeg,Hans-ChristianWille,KaiSchlage,TatyanaGuryeva,DanielSchumacher,IngoUschmann,4343,421KaiS.Schulze,BeritMarx,TinoKa¨mpfer,GerhardG.
2、Paulus,RalfRo¨hlsberger,andJo¨rgEvers1Max-Planck-Institutfu¨rKernphysik,Saupfercheckweg1,69117Heidelberg,Germany2DeutschesElektronen-SynchrotronDESY,Notkestraße85,22607Hamburg,Germany3Institutfu¨rOptikundQuantenelektronik,Friedrich-Schiller-Universita¨tJena,Max-Wien-Platz1,07743J
3、ena,Germany4Helmholtz-InstitutJena,Fro¨belstieg3,07743Jena,Germany(Received3May2013;published14August2013)Thecontroloflight-matterinteractionatthequantumlevelusuallyrequirescoherentlaserfields.Butalreadyanexchangeofvirtualphotonswiththeelectromagneticvacuumfieldalonecanleadtoquantu
4、mcoherences,whichsubsequentlysuppressspontaneousemission.Wedemonstratesuchspontaneouslygeneratedcoherences(SGC)inalargeensembleofnucleioperatinginthex-rayregime,resonantlycoupledtoacommoncavityenvironment.TheobservedSGCoriginatesfromtwofundamentallydifferentmechanismsrelatedtocoo
5、perativeemissionandmagneticallycontrolledanisotropyofthecavityvacuum.Thisapproachopensnewperspectivesforquantumcontrol,quantumstateengineeringandsimulationofquantummany-bodyphysicsinanessentiallydecoherence-freesetting.DOI:10.1103/PhysRevLett.111.073601PACSnumbers:42.50.Nn,03.65.
6、Yz,42.50.CtLight-matterinteractionatthequantumlevelisubiqui-differentdecaypathwaysbecomeindistinguishable[15].tousinamultitudeofmodernapplicationsandinfunda-Observationsinartificialquantumsystems[8]canbementalstudiesonthefoundationsofphysicsalike.EventheinterpretedintermsofSGC[16]
7、.Analternativeroutetoseeminglysimpleprocessofspontaneousemission(SE)ofaobservingSGCare-typeatomsinwhichoneexcitedquantumsystem(e.g.,anatom)issurprisinglycomplex[1].statedecaystomultiplelowerstates.Here,onecaneraseItarisesfromtheexchangeofvirtualphotonsbetweenthetheknowledgetowhi
8、chlowerstatetheatomhasdecayedatomandthes
