共查询到20条相似文献,搜索用时 46 毫秒
1.
We propose two schemes for splitting single- and two-qubit states by using four-particle genuine entangled state as the quantum channel. After the sender performs Bell-basis (or three-partite GHZ- basis) measurements on her particles, and the cooperators operate single-particle measurements on their particles, the state receiver can reconstruct the original state of the sender by applying the appropriate unitary operation. In particular, in the scheme for splitting two-qubit state, the receiver needs to introduce an auxiliary particle and carries out a C-NOT operation. 相似文献
2.
Quantum state sharing of an arbitrary qudit state by using nonmaximally generalized GHZ state 下载免费PDF全文
We present a scheme for quantum state sharing of an arbitrary qudit state by using nonmaximally entangled generalized Greenberger-Horne-Zeilinger (GHZ) states as the quantum channel and generalized Bell-basis states as the joint measurement basis. We show that the probability of successful sharing an unknown qudit state depends on the joint measurements chosen by Alice. We also give an expression for the maximally probability of this scheme. 相似文献
3.
Teleportation of an unknown bipartite state via non-maximally entangled two-particle state 总被引:1,自引:0,他引:1 下载免费PDF全文
In this paper a new scheme for teleporting an unknown entangled state of two
particles is proposed. To weaken the requirement for the quantum
channel, without loss of generality, two communicators only share a
non-maximally entangled two-particle state. Teleportation can be
probabilistically realized if sender performs Bell-state
measurements and Hadamard transformation and receiver introduces two
auxiliary particles, operates C-not operation, single-qubit
measurements and appropriate unitary transformations. The
probability of successful teleportation is determined by the smaller
one among the coefficients' absolute values of the quantum
channel. 相似文献
4.
Quantum state sharing of an arbitrary two-qubit state
with two-photon entanglements and Bell-state measurements 总被引:4,自引:0,他引:4
F.-G. Deng X.-H. Li C.-Y. Li P. Zhou H.-Y. Zhou 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2006,39(3):459-464
Two schemes for sharing an arbitrary two-qubit state based on
entanglement swapping are proposed with Bell-state measurements
and local unitary operations. One is based on the quantum channel
with four Einstein-Podolsky-Rosen (EPR) pairs shared in advance.
The other is based on a circular topological structure, i.e., each
user shares an EPR pair with his neighboring one. The advantage of
the former is that the construction of the quantum channel between
the agents is controlled by the sender Alice, which will improve
the security of the scheme. The circular scheme reduces the
quantum resource largely when the number of the agents is large.
Both of those schemes have the property of high efficiency as
almost all the instances can be used to split the quantum
information. They are more convenient in application than the
other schemes existing as they require only two-qubit
entanglements and two-qubit joint measurements for sharing an
arbitrary two-qubit state. 相似文献
5.
Qin-nan Zhang Cui-cui Li Yuan-hua Li Yi-you Nie 《International Journal of Theoretical Physics》2013,52(1):22-27
A novel quantum secure direct communication scheme based on four-qubit cluster states is proposed. In this scheme, the quantum channel between the sender Alice and the receiver Bob consists of an ordered sequence of cluster states which are prepared by Alice. After ensuring the security of quantum channel, Alice prepares the encoded Bell-state sequence, and performs Bell-basis measurements on the qubits at hand. Then Alice tells the measured results to Bob, and Bob also performs Bell-basis measurements on his own qubits. Finally Bob can get the secret information through the analysis of their measured results. In our scheme, the qubits carrying the secret message do not need to be transmitted in public channel. We show this scheme is determinate and secure. 相似文献
6.
Several teleportation schemes of an arbitrary unknown multi-particle state via different quantum channels 下载免费PDF全文
We first provide four new schemes for two-party quantum teleportation of an arbitrary unknown multi-particle state by using three-, four-, and five-particle states as the quantum channel, respectively. The successful probability and fidelity of the four schemes reach 1. In the first two schemes, the receiver can only apply one of the unitary transformations to reconstruct the original state, making it easier for these two schemes to be directly realized. In the third and fourth schemes, the sender can preform Bell-state measurements instead of multipartite entanglement measurements of the existing similar schemes, which makes real experiments more suitable. It is found that the last three schemes may become tripartite controlled teleportation schemes of teleporting an arbitrary multi-particle state after a simple modification. Finally, we present a new scheme for three-party sharing an arbitrary unknown multi-particle state. In this scheme, the sender first shares three three-particle GHZ states with two agents. After setting up the secure quantum channel, an arbitrary unknown multi-particle state can be perfectly teleported if the sender performs three Bell-state measurements, and either of two receivers operates an appropriate unitary transformation to obtain the original state with the help of other receiver's three single-particle measurements. The successful probability and fidelity of this scheme also reach 1. It is demonstrated that this scheme can be generalized easily to the case of sharing an arbitrary unknown multi-particle state among several agents. 相似文献
7.
A scheme for remotely preparingan arbitrary five-qubit Brown state by using three three-qubit GHZ states as the quantum channel is proposed. It is shown that, after the sender performs two different three-qubit projective measurements, the receiver should introduce two auxiliary qubits and employ suitable C-NOT gates, Toffoli gate and unitary operations on his qubits, the original state can be recovered with unit probability. Compared with the previous scheme, the advantage of the present scheme is that the entanglement resource can be reduced. 相似文献
8.
Non-Maximally Entangled Controlled Teleportation Using Four Particles Cluster States 总被引:1,自引:0,他引:1
Yi-You Nie Zhi-Hui Hong Yi-Bin Huang Xiao-Jie Yi Song-Song Li 《International Journal of Theoretical Physics》2009,48(5):1485-1490
A new scheme for controlled teleportation with the help of a four-qubit cluster state is proposed. In this scheme, a four-particle
cluster state is shared by a sender, a controller and a receiver. The sender first performs a Bell-basis measurement on the
qubits at hand, and the controller performs measurements under a non-maximally entangled Bell-basis after he knows the sender’s
measurement result. Then the receiver introduces an auxiliary qubit and performs some appropriate unitary transformations
on his qubits. Quantum teleportation is realized after the receiver performs a local measurement on the auxiliary qubit and
an appropriate unitary transformation on his qubit. 相似文献
9.
A scheme for controlled teleportation of an arbitrary two-particle state using a maximally entangled EPR pair and a cluster state as the quantum channel is proposed. After receiving Alice's Bell state measurement results, the controller performs a joint measurement on his particles under a non-maximally entangled Bell-basis.The receiver needs to introduce an auxiliary qubit, and performs aseries of appropriate unitary transformations on his particles.
The original state can be teleported successfully with theprobability 2cos2θ. 相似文献
10.
A scheme for probabilistic teleportation of an unknown three-atom entangled state via a five-atom non-maximally entangled cluster state as quantum channel is proposed. In this scheme, the sender performs two Bell state and a single-atom measurements on the atoms, the receiver can reconstruct the original state with a certain probability by introducing an auxiliary atom and operating appropriate unitary transformations and controlled-not (C-not) operations according to the sender Alice's measurement results. As a result, the probability of successful teleportation is determined by the smallest two of the coefficients'absolute values of the cluster state. The considerable advantage of our scheme is that we employ a non-maximally entangled cluster state as quantum channel in the scheme, which can greatly reduce the amount of entanglement resources and need less classical bits. If we employ a maximally entangled cluster state as quantum channel, the probabilistic teleportation scheme becomes usual teleportation, the successful probability being 100%. 相似文献
11.
提出一个隐形传送任意三原子纠缠W态的方案,在此方案中,选用由四个全同的二能级原子组成的cluster态作为量子信道.研究表明,接收者基于发送者的经典信息,借助于一个附加原子,实行联合幺正变换以及单原子幺正变换,可实现三原子W态的隐形传送.该方案不受外界热场和腔场耗散的影响,不需要贝尔态测量,成功实现传送的几率为1. 相似文献
12.
Chuan-Jia Shan Ji-Bing Liu Tao Chen Tang-Kun Liu Yan-Xia Huang Hong Li 《International Journal of Theoretical Physics》2010,49(2):334-342
In this paper, we proposed an experimentally feasible new scheme for controlled quantum secure direct communication in cavity
quantum electrodynamics without apparent joint Bell-state measurement. According to the results measured by the sender and
the controller, the receiver can obtain different secret messages in a deterministic way using GHZ state as the quantum channel
with unit successful probability if controller cooperates with it. In the communication processes, with the assistance of
a strong classical driving field, the interactions between atoms and a single-mode nonresonant cavity substitute the generalized
joint Bell-basis measurements. So this scheme only need separate measurements. In addition, the scheme is insensitive to the
cavity decay and the thermal field. The discussion of the scheme indicates that it is simple and realizable with present technology. 相似文献
13.
We construct several distinct schemes for tripartite Quantum state sharing (QSTS) of arbitrary single- and two-qubit states. Our schemes use genuinely entangled five-qubit state that has recently been introduced by Brown et al. [J. Phys. A 38 1119 (2005)] as the quantum channel. The Bell-state measurements and the single-qubit measurement are needed in our schemes. In comparison with the QSTS scheme using the same quantum channel [Phys. Rev. A 77 (2008) 032321], not joint measurement, which makes this scheme simpler than the latter. 相似文献
14.
提出了一个基于高维2m+1粒子纠缠态的任意m粒子态量子可控离物传态方案,发送方Alice对需传送的未知态量子系统和手中的纠缠粒子执行m个广义Bell基测量,控制方执行广义X基测量,依据预先共享量子纠缠态非定域相关性,接收方对手中的粒子执行相应的幺正操作就可以重建原来未知量子态.与其他方案相比,方案减少了任意高维多粒子态可控离物传送所需传送粒子数.我们进一步讨论了基于纯纠缠信道的概率量子可控离物传态方案,通过与发送方和控制方合作,接收方只需对手中的纠缠粒子和引入的附加粒子执行联合幺正演化和投影测量,就可以在他的粒子上概率的重建原来的未知量子态,最后,方案计算讨论了基于纯纠缠态量子可控离物传态成功概率与信道纠缠度之间的关系. 相似文献
15.
Using partial entangled states as the quantum channel, two schemes for probabilistic remote preparation of the four-particle cluster-type state with real and complex coefficients are presented. In the first scheme, the sender and the receiver share two partial Bell states and one partial three-qubit GHZ stats as the quantum channel, and the sender can help a remote receiver to prepare a four-particle entangled cluster-type state by using three-qubit projective measurements with certain probability. In the second scheme, the quantum channel is composed of two partial three-qubit GHZ states, the remote state preparation (RSP) can be successfully realized via the positive operator valued measure (POVM), and the two-particle projective measurements are also needed in this process. The total success probability and classical communication cost are calculated. 相似文献
16.
Recently Zha et al. (J. Phys. A: Math. Theor. 45:255–302 2012) have proposed a seven-particle maximally entangled state. In this paperwe propose a schemes for splitting three-qubit states by using seven-particle maximally entangled state as the quantum channel. After the sender performs Bell-basis measurements on her particles, and the cooperators operate single-particle measurements on their particles, the state receiver can reconstruct the original state of the sender by applying the appropriate unitary operation. 相似文献
17.
R. H. Shi L. S. Huang W. Yang H. Zhong 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2010,57(2):287-291
We present an asymmetric scheme for five-party quantum state sharing of an arbitrary m-qubit state with the maximally entangled
states of two-particle and three-particle. It involves two-particle Bell-basis or three-particle GHZ-basis measurements, rather
than five-particle entanglements and five-particle joint measurements, which makes it more convenient in a practical application
than some previous schemes. In addition, except that the designated recover of the quantum secret just keeps m particles,
other agents only hold one particle in their hands respectively, and thus they only need perform a single-particle measurement
on the respective particle with the basis X. Its intrinsic efficiency for qubits approaches 100%, and the total efficiency
really approaches the maximal value. 相似文献
18.
A scheme for quantum state sharing of an arbitrary m-qudit state is proposed with two-qudit entanglements and generalized Bell-state (GBS) measurements. In this scheme, the sender Alice should perform m two-particle GBS measurements on her 2m qudits, and the controllers also take GBS measurements on their qudits and transfer their quantum information to the receiver with entanglement swapping if the agents cooperate. We discuss two topological structures for this quantum state sharing scheme, a dispersive one and a circular one. The former is better at the aspect of security than the latter as it requires the number of the agents who should cooperate for recovering the quantum secret larger than the other one. 相似文献
19.
We propose a three-party scheme for probabilistically teleporting an arbitrary two-qubit state. In the scheme, a one-dimensional five-qubit cluster-class state is utilized as the quantum channel. The sender performs two Bell-state measurements (BSMs) on the qubits at hand and the controller makes a single-qubit measurement. With the sender’s and the controller’s helps, the receiver can reconstruct the original state with a certain probability by introducing an auxiliary qubit and making appropriate unitary operations. Moreover, the total success probability and classical communication cost of the present scheme are also calculated. 相似文献