In order to transmit secure messages,a quantum secure direct communication protocol based on a five-particle cluster state and classical XOR operation is presented.The five-particle cluster state is used to detect eavesdroppers,and the classical XOR operation serving as a one-time-pad is used to ensure the security of the protocol.In the security analysis,the entropy theory method is introduced,and three detection strategies are compared quantitatively by using the constraint between the information that the eavesdroppers can obtain and the interference introduced.If the eavesdroppers intend to obtain all the information,the detection rate of the original ping-pong protocol is 50%;the second protocol,using two particles of the Einstein-Podolsky-Rosen pair as detection particles,is also 50%;while the presented protocol is 89%.Finally,the security of the proposed protocol is discussed,and the analysis results indicate that the protocol in this paper is more secure than the other two.

A quantum secure direct communication protocol based on a five-particle cluster state and classical XOR operation

High-dimensional Bell state analysis (HDBSA) has great application potential in the high-capacity quantum communication and quantum information processing. In this paper, we propose a scheme to completely distinguish the 2N-dimensional Bell states of a hybrid system with the help of the nonlinear interaction between the Λ-type atoms and a photon system. We use the unit-probability quantum teleportation with non-maximum entanglement as an example to show the application of HDBSA. Finally, we discuss its possible realization with current experimental techniques. Our HDBSA protocol may pave a new way for high-capacity long-distance quantum communication.

High-Dimensional Bell State Analysis for Photon-Atoms Hybrid System

我们建议直接通讯计划基于格林 Horne-Zeilinger (GHZ ) 说的新多党的同时的量并且稠密的编码。为没有漏任何信息，完成高效率，四个编码计划预先被准备。现在的计划有播送的能力(M + 1 ) 当时，每一些 M 粒子， GHZ 说的 M 古典位在那里存在 M 聚会。重排的技术粒子平等地做合法用户在一样的长度交换他们的消息。对普通攻击的高效率和优秀安全是这个新计划的优点。

Multiparty Quantum Chatting Scheme

The invention relates to an ultra-dense millimeter wave D2D communication interference management method. The method mainly solves the problem that beam width selection and resource allocation cannotbe considered at the same time in the aspect of interference management in the prior art. The invention provides an ultra-dense millimeter wave D2D communication interference management method based on combined beam width selection and resource optimization. The ultra-dense millimeter wave D2D communication interference management method comprises the following steps that firstly, system modelingand interference management problem modeling are conducted on a millimeter wave D2D communication system; Secondly, beam width selection is conducted through particle swarm optimization, and an optimal beam width vector is obtained; Finally, optimal joint power and time slot allocation vectors are obtained through resource optimization based on convex optimization approximation; According to the interference management method based on combined beam width selection and resource optimization, interference can be effectively managed, the number of parallel transmission links is increased, and a higher system and a higher rate are obtained.

ultra-dense millimeter wave D2D communication interference management method

The invention discloses a method for transmitting 3-particle W-state by 5-particle Brown state based on quantum Fourier transform. A unitary transformation acquisition method based on quantum Fouriertransform is utilized to acquire a relation between a measurement result of the 5-particle Brown state and corresponding unitary transformation, and the problem corresponding to the non-linearity in the 5-particle Brown state transmitting the 3-particle W-state is solved, thereby improving the transmission accuracy and the transmission efficiency.

Method for transmitting 3-particle W-state by 5-particle Brown state based on quantum Fourier transform

Based on the characteristics of three-particle GHZ state, we propose a novel quantum secure direct communication scheme(QSDC). In the process of security check, both sides of communication detect single particle with the entanglement properties between the particles. The number of possible quantum states has greatly increased and there are more errors when the check particles are attacked. The error rate for eavesdropper is increased with 62.5%. The security of the scheme is improved.

High security quantum secure direct communication protocol based on three — Particle GHZ states

The invention discloses a D2D communication interference management method based on joint interference alignment and power optimization, which mainly solves the problem that the interference intensities from different interference links are different caused by that the existing method cannot guarantee the interference alignment feasibility and the path losses of different interference links are different The implementation process is as follows: the system decomposes the optimization problem into three sub-problems, and obtains a second-best solution of the original problem by solving these three sub-problems in turn: firstly selecting an appropriate interference link under the premise of ensuring that the interference alignment is feasible for interference alignment, and calculating theconnectivity coefficient matrix a; secondly, designing the partial connectivity interference alignment pre-coding V and the decoding matrix G for the selected interference link; and finally, performing iterative convex approximation power optimization for the remaining interferences The invention may increase the degree of freedom of D2D and cellular communication links while effectively improving the network throughput

D2D communication interference management method based on joint interference alignment and power optimization

The invention discloses a quantum stealth communication method based on the transmission of a four-particle state through a 5-particle Brown state. According to the method, a sender Alice prepares a quantum state channel; the sender Alice transmits the 4-particle state carrying a secret information sequence G to a receiver Bob through the quantum state channel, wherein the 4-particle state is represented by a symbol described in the descriptions of the invention, and the quantum state channel is composed of the 5-particle Brown state; in a communication process, the sender retains 1 quantum bit, so as to realize communication exchange of 4 quantum bits, and therefore, the transmission of five-classic bit secret information is achieved; and the 5-bit secret information transmission is implemented by means of binary dense coding. The communication efficiency of the communication method provided by the invention reaches 33%; and the communication method can effectively prevent the information from being eavesdropped and attacked during the communication process.

Quantum stealth communication method based on transmission of four-particle state through 5-particle Brown state

The invention discloses a quantum key distribution method based on 4-particle cluster states. A sender Alice and a receiver Bob respectively obtain the same sharing key. The sender Alice shares the key with the receiver Bob through utilization of the 4-particle cluster states. The receiver Bob receives 4 cluster state particles and then directly carries out particle grouping and measurement on theparticles. The problem that quantum bit storage time is short is overcome. When a third party eavesdrops in a communication process, a bit inconsistent rate of the communication method provided by the invention is 37.5%. When an eavesdropping detection rate reaches P =0.999999999, 44 bits of key bits need to be transmitted as a detection sequence. Compared with a BB84 protocol, the method has the advantage that the communication efficiency is higher.

Quantum key distribution method based on 4-particle cluster states

The invention discloses a controlled quantum secure direct communication method based on five particles. A method of sending a particle to a receiver is adopted, and the transmission efficiency of communication is improved by reducing the number of particles transmitted in a quantum channel; and a sender retains 3 particles in the communication process, adopts a quantum state to encode 3 bits of information, thereby improving the encoding capacity, increasing the number of information bits exchanged by both communication parties, and improving the transmission efficiency by 60%.

Controlled quantum secure direct communication method based on five particles

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