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1.
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
2.
XUE Zheng-Yuan YI You-Min CAO Zhuo-Liang 《理论物理通讯》2006,46(2):225-228
Teleportation schemes with a tripartite entangled state in cavity QED are investigated. The schemes do not need Bell state measurements and the successful probabilities reach optimality. In addition, the schemes are insensitive to both the cavity decay and the thermal field. We first consider two teleportation schemes via a tripartite GHZ state. The first one is a controlled one for an unknown single-qubit state. The second scheme is teleportation of unknown two-atom entangled state. Then we consider teleporting of single-qubit arbitrary state via a tripartite W state. 相似文献
3.
Teleportation schemes with a tripartite entangled state in cavity QED are investigated. The schemes do not need Bell state measurements and the successful probabilities reach optimality. In addition, the schemes are insensitive to both the cavity decay and the thermal field. We first consider two teleportation schemes via a tripartite GHZ state.The first one is a controlled one for an unknown single-qubit state. The second scheme is teleportation of unknown two-atom entangled state. Then we consider teleporting of single-qubit arbitrary state via a tripartite W state. 相似文献
4.
Recently, deterministic joint remote state preparation (JRSP) schemes have been proposed to achieve 100% success probability. In this paper, we propose a new version of deterministic JRSP scheme of an arbitrary two-qubit state by using the six-qubit cluster state as shared quantum resource. Compared with previous schemes, our scheme has high efficiency since less quantum resource is required, some additional unitary operations and measurements are unnecessary. We point out that the existing two types of deterministic JRSP schemes based on GHZ states and EPR pairs are equivalent. 相似文献
5.
We propose some schemes for remote preparation of arbitraryhigh-dimensional equatorial entangled state via a single bipartitehigh-dimensional entangled state as quantum channel. We firstlypresent the remote preparation of bipartite three- and d-dimensionalequatorial entangled state by using a single entangled qutrit andqudit pair, respectively, and then directly generalize the schemesto multipartite case. The cases of the quantum channel beingnon-maximally two-qutrit and two-qudit entangled state are alsoconsidered, respectively. In these schemes the required resourcesare single-particle projective measurement, appropriate localunitary operation, auxiliary particle, and high-dimensional C-NOToperation. It is shown that the entanglement resource and classicalcommunication cost are both greatly reduced in our schemes. 相似文献
6.
An all W-type state task is put forward: joint remote state preparation of a W-type state via W-type states. We propose two probabilistic yet faithful schemes for the task. The first scheme uses two arbitrary W-type states as the shared quantum resource and the second scheme exploits three such states. We show that, while the first scheme requires some additional quantum resource and technical operations from the receiver, the second scheme allows any completely unequipped party to play the role of receiver. In both schemes the classical communication cost is one bit per preparer. 相似文献
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Remote preparation of a Greenberger--Horne--Zeilinger state via a two-particle entangled state 总被引:2,自引:0,他引:2 下载免费PDF全文
We present two schemes for realizing the remote preparation of a
Greenberger--Horne--Zeilinger (GHZ) state. The first scheme is to remotely
prepare a general N-particle GHZ state with two steps. One is to prepare a qubit
state by using finite classical bits from sender to receiver via a
two-particle entangled state, and the other is that the receiver introduces
N - 1 additional particles and performs N - 1 controlled-not (C-Not)
operations. The second scheme is to remotely prepare an N-atom
GHZ state via
a two-atom entangled state in cavity quantum electrodynamics (QED). The two
schemes require only a two-particle entangled state used as a quantum
channel, so we reduce the requirement for entanglement. 相似文献
10.
提出用三粒子纠缠态作量子信道远程操纵单比特旋转的理论方案。首先,我们利用最大纠缠的GHZ态的性质远程操纵单比特旋转,其保真度和成功几率均为1。 我们还提出了两个用部分纠缠的GHZ态作量子信道实现保真度为1的远程操纵单比特旋转的方案。这些方案的特点是,两地之间还存在一第三者,他作为监控方参与量子远程操纵过程,特别地,当量子信道为部分纠缠态时,他能矫正被非理想量子信道致畸的量子态。除了GHZ型态外,我们还证明了W型态亦可用作量子信道远程操纵单比特旋转,但后者的成功几率总是小于前者。 相似文献
11.
We investigate the controlled implementation of a non-local CNOT operation using a three-qubit entangled state. Firstly, we show how the non-local CNOT operation can be implemented with unit fidelity and unit probability by using a maximally entangled GHZ state as controlled quantum channel. Then, we put forward two schemes for conclusively implementing the non-local
operation with unit fidelity by employing a partially entangled pure GHZ
state as quantum channel. The feature of these schemes is that a third
side is included, who may participate the process of quantum non-local
implementation as a supervisor. Furthermore, when the quantum channel is
partially entangled, the third one can rectify the state distorted by
imperfect quantum channel. In addition to the GHZ class state, the W class
state can also be used to implement the same non-local operation
probabilistically. The probability of successful implementation using the W
class state is always less than that using the GHZ class state. 相似文献
12.
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
13.
Implementation of unambiguous comparison for unknown pure quantum states with cavity-assisted interaction 下载免费PDF全文
We propose two effective schemes for local and remote unknown atomic state comparisons with a cavity-assisted single photon input-output process without any initial entanglement or auxiliary resource. The unambiguous state discrimination is considered using the state comparison process as the basic module. All the implementation schemes here just involve common quantum logic gates and the single qubit measurement. The analysis shows that our schemes are feasible under the current experimental conditions. 相似文献
14.
Teleportation of Two-Particle Entangled State via Cluster State 总被引:5,自引:0,他引:5
In this paper,two schemes for teleporting an unknown two-particle entangled state from the sender (Alice)to the receiver (Bob) via a four-particle entangled cluster state are proposed.In these two schemes,the unknown twoparticle entangled state can be teleported perfectly.The successful probabilities and fidelities of the schemes can reach unity. 相似文献
15.
We propose two schemes for quantum dense coding without Bell states measurement. One is deterministic, the other is probabilistic. In the deterministic scheme, the initial entangled state will be not destructed. In the probabilistic scheme, the initial unknown nonmaximal entangled state will be transformed into a maximalentangled one. Our schemes require two auxiliary particles and perform single-qubit measurements on them. Thus our schemes are simple and economic. 相似文献
16.
This paper proposes schemes for generating multiple-photon and
multiple-atom cluster states, respectively. The schemes are based on
the cavity input--output process and atomic or photonic states
measurement, and the successful probabilities approach unity in the
ideal case. The numerical simulations show that the produced
multiple-particle cluster states have high fidelity even if the
Lamb--Dicke condition is not satisfied. Some practical imperfections,
such as atomic spontaneous emission and output coupling inefficiency,
only decrease the success probability but exert no influence on the
fidelity of generated multiple-particle cluster states. From the
experimental point of view, smaller operation number and lack of need
for individual addressing keeps the schemes easy to implement. These
schemes may offer a promising approach to the generation of a
large-scale cluster state. 相似文献
17.
This paper proposes schemes for generating multiple-photon and multiple-atom cluster states, respectively. The schemes are based on the cavity input-output process and atomic or photonic states measurement, and the successful probabilities approach unity in the ideal case. The numerical simulations show that the produced multiple-particle cluster states have high fidelity even if the Lamb-Dicke condition is not satisfied. Some practical imperfections, such as atomic spontaneous emission and output coupling inefficiency, only decrease the success probability but exert no influence on the fidelity of generated multiple-particle cluster states. From the experimental point of view, smaller operation number and lack of need for individual addressing keeps the schemes easy to implement. These schemes may offer a promising approach to the generation of a large-scale cluster state. 相似文献
18.
We propose two schemes for teleporting an unknown state. In our schemes, a three-particle Greenberger-Horne-Zeilinger state is used as a quantum channel. We show that the probabilistic teleportation of an unknown quantum state can be realized. 相似文献
19.
利用一个(N 1)粒子部分纠缠Greenberger-Home-Zeilinger(GHZ)态作为量子通道,提出了概率远程制备N粒子GHZ态的两个方案.我们考虑了怎样远程制备一个任意的GHZ态,即两个参数α和β都是复数的情况.此外,计算了远程制备总的成功概率和需要的经典信息量. 相似文献
20.
In accordance with transformation operator, we give two schemes for teleporting an unknown one-particle state via a general GHZ state, Two Von Neumann type measurements are given for teleporting an unknown one-particle state. The first Von Neumann type measurement use four orthogonal states and the second Von Neumann type measurement is eight orthogonal states. For maximally entangled GHZ state, the successful probability and fidelity of two schemes both reach 1. 相似文献