基于法拉第旋转的GHZ态制备

The preparation of GHZ state based on Faraday rotation

利用光子在低品质腔的输入输出过程中产生的法拉第旋转制备原子的GHZ态.方案中的腔与原子之间是非强耦合,并且量子信息编码在原子低能级上,因此方案对腔衰减和原子自发辐射都不敏感.此外,方案不用对腔施加经典场,也不用选择相互作用时间,降低了实验上的难度.

We propose a scheme to prepare the GHZ state of the atoms using the Faraday rotation produced by the input and output process of photons in the low quality cavity.The coupling between atom and cavity isn＇t strong in the scheme.Meanwhile,the quantum information is encoded in the low energy level of atoms.Therefore,our scheme is insensitive to both cavity decay and atomic spontaneous emission.In addition,we need not to impose the classical field or choose interaction time during the whole process,which reduces the difficulty of experiment.