提出了利用四光子纠缠态进行联合退相位噪声和联合转动噪声下的量子离物传态方案.信息态的发送者Alice,根据噪声的不同,制备不同的四光子纠缠态,并把其中两个光子发送给Bob,另两个光子保留.Alice对手中的信息态和其中一个保留态进行联合Bell基测量,从而把信息态的部分信息转移到了Bob手中的光子上,然后Alice和Bob再对相应的光子做单光子测量,Bob根据单光子测量结果对手中未做单光子测量的光子实施合适的酉算符操作,从而得到信息态,实现联合噪声下的量子离物传态.本方案牵涉到两方(Alice和Bob),可以推广到多方可控离物传态.另外方案中仅需要进行联合Bell基测量和单光子测量,在实验上具有可行性.
The paper presents two quantum teleportation protocols against two kinds of collective noise,collective-dephasing noise and collective-rotation noise firstly with four-photon entangled states.Alice,the information state sender,prepares different four-photon entangled states according to the noise,and sends two of them to the information receiver—Bob,and the other two reserved.Alice makes Bell-based measurement between the information state and one of the reserved states.Thus part of the information of the information state will divert to Bob's photon.Then Alice and Bob make single photon measurement on related photons.According to the results of the single photon measurement,Bob makes appropriate unitary operations on the photon without the single photon measurement,and the information state will be obtained,therefore the quantum teleportation under collective noise is realized.The protocols involve two parties(Alice and Bob),and it can be generalized to multiparty controlled teleportation protocols.Moreover,it just needs Bell-based measurement and single photon measurement,so it is feasible in the experiment.