利用cluster态实现任意两粒子纠缠态的概率隐形传态

提出两个概率隐形传态方案,这两个方案都是以一个四粒子cluster非最大纠缠态作为量子信道来实现未知两粒子纠缠态的隐形传态.在第一个方案中传送的是一个特殊的两粒子纠缠态,此纠缠态可以实现一定的概率传输,此概率由cluster态中绝对值较小的两个系数决定.在第二个方案中,传送的是任意两粒子纠缠态,与第一方案相比,Bob除了需要实施幺正变换外,还要实施量子控制相位门才能重建被传送的纠缠态.使用非最大纠缠cluster态作为量子信道可以节约更多的纠缠资源和经典信息.     

利用Bell态实现量子隐形传态

量子隐形传态不仅在物理学领域对人们认识与揭示自然界的神秘规律具有重要意义，而且可以用量子态作为信息载体，通过量子态的传送完成大容量信息的传输，实现原则上不可破译的量子保密通信。文章从信息论的角度描述了量子比特、量子纠缠态，如何利用量子线路实现Bell态，提出了一种利用Bell态实现隐形传态的简单结构的量子线路，证明该量子线路是可行的，为进一步研究量子密码通信奠定了基础。     

基于五粒子cluster态的受控双向量子隐形传态

提出了一个由三方共享五粒子Cluster态为量子通道进行单粒子双向隐形传送的方案。方案中通信双方Alice和Bob各拥有五粒子Cluster态中的2个粒子以及未知单粒子态的粒子A和B,控制者Cindy拥有Cluster态中1个粒子。Alice和Bob首先分别对手中的粒子A,B以及通道中的1个粒子做bell基测量。并通过经典信道将测量结果告知对方以及控制者Cindy。接着,Cindy对手中的粒子做单粒子投影测量,并通过经典信道告知Alice和Bob测量结果。Alice和Bob根据三方的测量结果分别对手中的另一个粒子做出相应的幺正操作便可得到对方所要传送的量子态,使得单粒子态的受控双向隐形传态的目的得以实现。     

基于四粒子GHZ纠缠态实现双向隐形传态

提出了一种用四粒子GHZ纠缠态作为量子信道,实现量子双向隐形传态的方案。通信双方Alice和Bob事先共享俩对四粒子GHZ纠缠态。通信开始后,Alice和Bob分别对自己拥有的粒子作量子投影测量,并将测量结果通过经典信道告诉对方。Alice和Bob根据对方提供的测量结果,做相应的幺正变换,即在己方的粒子上再现对方要传的量子信息,从而实现整个双向传态的目的。只要通信双方事先选取合适的GHZ纠缠态作为量子信道以及分发不同对应的纠缠粒子即可分别实现单量子比特任意态、双量子比特Bell纠缠态和三量子比特GHZ纠缠态的双向隐形传态。     

基于W类态的未知两粒子纠缠态的量子隐形传态

提出了一种用W类态作为信道对未知二粒子纠缠态进行隐形传态的方案。通过研究表明，接受者只要采取适当的幺正变换的策略就可以实现概率性的隐形传态。     

基于W类态的未知两粒子纠缠态的量子隐形传态

提出了一种用W类态作为信道对未知二粒子纠缠态进行隐形传态的方案。通过研究表明,接受者只要采取适当的幺正变换的策略就可以实现概率性的隐形传态。     

利用一个两粒子纠缠态实现三粒子GHZ纠缠态的隐形传态

提出利用一个两粒子纠缠态传送N粒子GHZ纠缠态的方案,首先考察三粒子GHZ纠缠态在量子信道是最大纠缠态时情形,然后进一步考察量子信道是非最大纠缠态的情形,发现通过对某些粒子执行H操作和von Neumann测量,并引进两个辅助比特,在非最大纠缠态时还需构造一个幺正变换矩阵,可实现三粒子GHZ纠缠态的隐形传态,最后推广至N粒子,该方案相比其它方案最大的优点是节约了量子信道纠缠资源。     

四粒子任意态的概率隐形传态的两种方案

提出利用四个二粒子部分纠缠态作为量子信道,实现四粒子任意纠缠态的概率隐形传输的两种方案.发送者做四次Bell基测量,然后接收者通过引入辅助粒子并做适当的幺正变换,就能以一定的概率完成四粒子纠缠态的隐形传输.由变换算符出发,利用变换算符之间的关系给出两种方案的理论分析.     

基于四粒子团簇态的可控量子隐形传态

提出利用四粒子团簇态传送一个未知单粒子态从而实现可控量子隐形传态的方案,发送者对她自己拥有的两个粒子做一次Bell基联合测量,两控制者合作对其两粒子进行Bell基联合测量,接收者在两个控制者的帮助下对其自己的粒子做相应的幺正变换,即可得到要传送的单粒子态,完成可控量子隐形传态.     

基于Cluster态的两粒子纠缠受控隐形传态

In order to teleport an unknown two-particle entangled state via a cluster state, a controlled teleportation scheme is proposed. It is shown that an unknown two-particle entangled state can be successfully transmitted from the sender Alice to the receiver Bob with the help of the supervisor Charlie via the only one four-particle cluster state. The receiver can reconstruct the teleported state according to the measurement results of the sender and supervisor. Quantum Controlled-NOT (CNOT) gate and POVM are used, which have been accomplished in a quantum experiment, so it is believed that this scheme will be realized by experiment. By analysis, the success probability of the proposed scheme reaches 1.0.     

基于四粒子欧米伽纠缠态实现双向隐形传态

提出了一种利用四粒子 纠缠态作为量子信道,实现单量子比特、双量子比特以及受限三量子比特的双向隐形传态方案。当纠缠的粒子个数大于3时,会呈现出与一般两粒子纠缠时不同的特殊性质。这种由多个粒子纠缠在一起的纠缠态,被称为团簇态。选用四粒子 纠缠态作为量子信道。距离很远的通信双方事先共享制备好的两对四粒子 纠缠态。通信开始时,通信双方把各自待传的粒子放到量子信道上,形成系统的初态。通信开始后,只要通信双方选择合适的正交完备基分别对自己拥有的部分粒子做量子投影测量,把测量结果通过经典信道传送给对方,双方根据对方的测量结果,选择相应的幺正变换可以得到对方待传的未知的量子态。     

Teleportation of an Arbitrary Two-qubit State *

A scheme to teleport an unknown two-qubit state from Alice (the sender) to Bob (the receiver) using two Einstein-Podolsky-Rosen (EPR) pairs is presented, each EPR pair being shared by both Alice and Bob. Firstly, Alice combines each of the two particles in the teleported state with an EPR particle and makes Bell state measurement on each combination. Then she transmits the outcomes of her measurements to Bob classically. According to Alice′s measurement results, Bob can perform appropriate unitary operations on his two EPR particles to retrieve the initial state.     

确定性联合远程制备任意四粒子Genuine纠缠态(英文)

A novel deterministic joint remote preparation scheme of arbitrary four-particle genuine entangled state from one sender to either of two receivers is proposed. Two three-particle Green-Horne-Zeilinger (GHZ) states and one four-particle GHZ state are used as the quantum channel. The presented scheme is realized through orthogonal projective measurement of the Hadamard transferred basis and recovery operation ijk U . Some useful and general measurement bases have been constructed. The classical communication cost of the presented scheme is also calculated. Our analysis confirms the feasibility and validity of the proposed method, and shows that it has a 100% probability of success in preparation of the target quantum state.     

一种四粒子纠缠态信道量子稠密编码控制方案

以一个四粒子纠缠态作为量子信道,提出了一种对称信道中的量子稠密编码方案.通信中除了包含A、B收发双方外,还加入了两个控制者C和D.A、C和D需要对自己拥有的量子位进行操作,然后把粒子传送给接收者B.B在经过一系列的量子操作、量子变换及量子测量后,会获得可以代表经典数字信息的量子态.利用这一方案,A,B之间可以实现经典数字信息0-15在量子信道中的传递.     

Probabilistic Cluster Labeling of Imagery Data

In this paper the author considers the problem of obtaining the probabilities of class labels for the clusters using spectral and spatial information from a given set of labeled patterns and their neighbors. A relationship is developed between class and cluster conditional densities in terms of probabilities of class labels for the clusters. Expressions are presented for updating the a posteriori probabilities of the classes of a pixel using information from its local neighborhood. Fixed-point iteration schemes are developed for obtaining the optimal probabilities of class labels for the clusters. These schemes utilize spatial information and also the probabilities of label imperfections. Furthermore, experimental results from the processing of remotely sensed multispectral scanner imagery data are presented.