Evolution of a two-mode squeezed vacuum in the amplitude dissipative channel

For the first time we derive the dissipating result of an initial two-mode squeezed pure vacuum state passing through a two-mode amplitude dissipative channel described by the direct product of two independent single-mode master equations. Although these two master equations do not mix the two modes (there is no coupling between them), since the two-mode squeezed state is simultaneously an entangled state, the final state which emerges from passing this channel is a two-mode mixed density operator. The compact expression of the outcoming state is obtained, which manifestly shows that as time evolves, the squeezing effect decreases.     

Evolution of a two-mode squeezed vacuum in the amplitude dissipative channel

For the first time we derive the dissipating result of an initial two-mode squeezed pure vacuum state passing through a two-mode amplitude dissipative channel described by the direct product of two independent single-mode master equations. Although these two master equations do not mix the two modes (there is no coupling between them), since the two-mode squeezed state is simultaneously an entangled state, the final state which emerges from passing this channel is a two-mode mixed density operator. The compact expression of the outcoming state is obtained, which manifestly shows that as time evolves, the squeezing effect decreases.     

基于电路量子电动力学系统实现一维cluster态的制备

在电路量子电动力学系统中,本文提出利用磁通比特和LC电路间的耦合来制备多比特的一维cluster态的方案。方案中,LC电路作为中间转化器,通过选择恰当电磁场的参数和调节比特间的能级间隔,使磁通比特间发生纠缠从而制备出多比特的一维cluster态。在大失谐的条件下,磁通比特和量子数据总线间的相互作用可通过调节虚光子来转化。此外,该方案的合理性也已在实验上得到了证明。