论文标题
纠缠及其在信息处理中的效用
Study on Entanglement and its Utility in Information Processing
论文作者
论文摘要
已经研究了最大的和非最大值纠缠的混合状态作为传送通道的效力。还提出了一类新的非最大程度纠缠的混合状态。它们的优势是验证了量子传送通道比现有非最大程度的混合状态的量子传送道。混合状态也可以使用量子克隆机产生。我们还研究了如何利用从态和密集编码中从状态独立的量子克隆机获得的输出获得的混合纠缠状态。混合国家也可以用于秘密共享。已经设计了一个新的秘密共享协议，其中涉及四个政党。其中一个天生就是诚实的，另一个是不诚实的。不诚实的一个有两个同事，他们也参与了协议。通过使用量子克隆机，诚实的聚会如何阻止不诚实的政党向他的同伙传达秘密信息。在最初准备的状态的纠缠中建立了关系，在诚实政党应用克隆方案和克隆机器的克隆参数之后，不诚实一人接受的混合状态的纠缠状态。已经讨论了在受控密集编码中三方和四方纠缠状态的有用性。论文以未来作品的摘要和可能的课程结束。
The efficacies of maximally and that of non-maximally entangled mixed states as teleportation channels have been studied. A new class of non-maximally entangled mixed states have been proposed also. Their advantages as quantum teleportation channels over existing non-maximally entangled mixed states have been verified. The mixed states can also be generated using quantum cloning machines. We have also studied how one can utilize the mixed entangled states obtained as output from a state independent quantum cloning machine in teleportation and dense coding. Mixed states can also be used in secret sharing. A new protocol of secret sharing has been devised where four parties are involved. One of them is honest by nature and the other is dishonest. The dishonest one has two associates who are also involved in the protocol. It has been shown how the honest party, by using quantum cloning machine, can prevent the dishonest party from communicating the secret message to his accomplices. A relation has been established among entanglement of the initially prepared state, entanglement of the mixed state received by the recipients of the dishonest one after honest party applies the cloning scheme and the cloning parameters of the cloning machine. The usefulness of tri-partite and four-partite entangled states in controlled dense coding has been discussed. The thesis concludes with the summary and possible courses of future works.
