共查询到11条相似文献,搜索用时 0 毫秒
1.
2.
Probabilistic remote preparation of a high-dimensional equatorial multiqubit with four-party and classical communication cost 下载免费PDF全文
This paper presents a protocol for probabilistic remote preparation of a high-dimensional equatorial multiqubit with four-party,consisting of a sender and three receivers.The quantum channel is composed of a partial entangled high-dimensional four-particle state.We calculate the successful total probability and the total classical communication cost required for this scheme.It is shown that both the entangled resources and classical communication cost are greatly reduced. 相似文献
3.
设计了一组新的量子远程态制备步骤,在发送方对手中的粒子完成测量后,接收方采用该步骤可以有效降低远程态制备的经典通信消耗-给出一种利用部分纠缠的三粒子Greenberger-Horne-Zeilinger(GHZ)态和部分纠缠的二粒子态作信道,远程制备一个三粒子GHZ态的方案,以此方案为例具体说明上述方法的运用步骤并给出了该方法的适用范围-结果表明,运用该方法后只需消耗1bit经典信息即可远程制备一个三粒子GHZ态-
关键词:
远程态制备
经典通信消耗
三粒子Greenberger-Horne-Zeilinger态
量子信道 相似文献
4.
LI Jiang-Fan FANG Jia-Yuan XIAO Fu-Liang LIU Xin-Hai WANG Cheng-Zhi 《理论物理通讯》2009,51(3):514-518
By properly selecting the time-dependent unitary transformation for the linear combination of the number operators, we construct a time-dependent invariant and derive the corresponding auxiliary equations for the degenerate and non-degenerate coupled parametric down-conversion system with driving term. By means of this invariant and the Lewis-Riesenfeld quantum invariant theory, we obtain closed formulae of the quantum state and the evolution operator of the system. We show that the time evolution of the quantum system directly leads to production of various generalized one- and two-mode combination squeezed states, and the squeezed effect is independent of the driving term of the Hamiltonian. In somespecial cases, the current solution can reduce to the results of the previous works. 相似文献
5.
A quantum secure direct communication protocol based on a five-particle cluster state and classical XOR operation 总被引:2,自引:0,他引:2
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. 相似文献
6.
YANG Xin-Gang WANG Zhi-Xi WANG Xiao-Hong FEI Shao-Ming 《理论物理通讯》2008,50(9):651-654
We classify biqutrit and triqutrit pure states under stochastic local operations and classical communication. By investigating the right singular vector spaces of the coefticient matrices of the states, we obtain explicitly two equivalent classes of biqutrit states and twelve equivalent classes of triqutrit states respectively. 相似文献
7.
The simplified four-qubit cluster state (i.e., (|0000〉 + |0011〉 + |1100〉 -|1111〉)/2) is explored for splitting an arbitrary single-qubit quantum information (QI). Various feasible distributions of the four qubits among the Q,I sender and receivers for tri-splitting or hi-splitting are found out. For the distribution representations the corresponding splitting schemes and their LOCCs (local operation and classical communication) are presented amply while others are mentioned concisely. 相似文献
8.
We classify biqutrit and triqutrit pure states
under stochastic local operations and classical communication. By
investigating the right singular vector spaces of the coefficient
matrices of the states, we obtain explicitly two equivalent classes
of biqutrit states and twelve equivalent classes of triqutrit states respectively. 相似文献
9.
10.
Classical Communication and Entanglement Cost in Preparing a Class of Multi-qubit States 总被引:1,自引:0,他引:1
PAN Gui-Xia LIU Yi-Min ZHANG Zhan-Jun 《理论物理通讯》2008,49(3):631-634
Recently, several similar protocols [J. Opt. B 4 (2002) 380; Phys. Lett. A 316 (2003) 159; Phys. Lett. A 355 (2006) 285; Phys. Lett. A 336 (2005) 317] for remotely preparing a class of multi-qubit states (i.e, α[0...0〉 +β[1... 1〉) were proposed, respectively. In this paper, by applying the controlled-not (CNOT) gate, a new simple protocol is proposed for remotely preparing such class of states. Compared to the previous protocols, both classical communication cost and required quantum entanglement in our protocol are remarkably reduced. Moreover, the difficulty of identifying some quantum states in our protocol is also degraded. Hence our protocol is more economical and feasible. 相似文献
11.
A lab-scale ultrasound enhancing Anammox reactor (R1) was established and irradiated once a week by ultrasound with the optimal parameter (frequency of 25 kHz, intensity of 0.2 W cm−2 and exposure time of 3 min) obtained by batch experiments. R1 and the controlled Anammox reactor (R2) without exposure to the ultrasound were operated in parallel. The start-up period of Anammox process (53 days) in R1 was shorter than that (61 days) in R2. The nitrogen loading-enhancing period (day 53-day 135) in R1 was also shorter than that (day 61-day 151) in R2. At the end of the nitrogen loading-enhancing period, NLR (0.76 kg N m−3 d−1) and NRR (0.68 kg N m−3 d−1) of R1 were both higher than NLR (0.66 kg N m−3 d−1) and NRR (0.56 kg N m−3 d−1) of R2. Moreover, The stability of Anammox process in R1 was better than that in R2. The results demonstrated that the periodical irradiation of ultrasound enhanced the start-up and operational performance of Anammox reactor. Microbial community analysis indicated that the ultrasound accelerated the microbial succession from some other bacteria to Anammox bacteria so that shorten the start-up period of Anammox process from the conventional activated sludge. It also indicated that the ultrasound strengthened the competitive advantage of Candidatus Kuenenia stuttgartiensis in Anammox bacteria of the mature sludge so as to enhance the nitrogen removal performance of the Anammox reactor under the operation condition of high nitrogen loading. 相似文献