Probabilistic Teleportation of a Four-Particle Entangled W State

In this paper, two schemes for teleporting an unknown four-particle entangled W state is proposed. In the first scheme, two partial entangled four-particle states are used as quantum channels, while in the second scheme,four non-maximally entangled particle pairs are considered as quantum channels. It is shown that the teleportation can be successfully realized with certain probability, for both schemes, if a receiver adopts some appropriate unitary transformations. It is also shown that the successful probabilities of these two schemes are different.

Probabilistic Teleportation of a Four-Particle Entangled State

A Scheme for teleporting an unknown four-particle entangled state is proposed via entangled swapping. In this scheme, four pairs of entangled particles are used as quantum channel. It is shown that, if the four pairs of particles are nonmaximally entangled, the teleportation can be successfully realized with certain probability if a receiver adopts some appropriate unitary transformations.

Probabilistic Teleportation of an Unknown Two-Particle State with a Four-Particle Pure Entangled State and Positive Operator Valued Measure

我们建议为有一个四粒子的纯纠缠的状态和积极操作员的一个 unknowntwo 粒子状态的概率的远距传物的一个计划珍视措施(POVM ) 。在这个计划，一个未知二粒子的状态的远距传物能被执行二贝尔状态大小，合适的 POVM 和单一的转变与某些概率认识到。

Quantum Secure Direct Communication Using Six-Particle Maximally Entangled States and Teleportation

纠缠的六粒子的格言联盟者与接收装置作为量隧道说的发送者份额。如果量隧道是安全的，发送者执行射影的大小并且把测量结果告诉接收装置。接收装置执行单一的转变并且在他的粒子上做射影的大小获得秘密信息。用远距传物， three-qubit 秘密信息的传播能在每条量隧道被完成。

Schemes for Probabilistic Teleportation of an Unknown Three-Particle Three-Level Entangled state

在这篇论文，为移植未知 three-particlethree-level 的电视的二个计划纠缠了状态被建议。在第一个计划，二部分 three-particlethree-level 纠缠了状态，在第二个计划被用作量隧道， threetwo 粒子三水平的 non-maximally 纠缠的状态作为量隧道被采用。远距传物能成功地与某些概率被认识到，这被显示出，为二个计划，如果接收装置采用一些适当单一的转变。这二个计划的成功的可能性是不同的，这也被显示出。

A Coding and Automatic Error-Correction Circuit Based on the Five-Particle Entangled State

In this paper, we discuss the concepts of quantum coding and error correction for a five-particle entangled state. Error correction can correct bit-reverse or phase-flip errors of one and two quantum states and is no longer limited to only one quantum state. We encode a single quantum state into a five-particle entangled state before being transferred to the sender. We designed an automatic error-correction circuit to correct errors caused by noise. We also simplify the design process for a multiple quantum error-correction circuit. We compare error-correction schemes for five and three entangled particles in terms of efficiency and capabilities. The results show that error-correction efficiency and fidelity are im- proved.

Schemes for Splitting Quantum Information with Four-Particle Genuine Entangled States

我们为由把四粒子的真纠缠的状态用作量隧道切开 single-qubit 和 two-qubit 状态建议二个计划。在发送者执行钟基础以后(或三深裂的 GHZ- 基础) 她的粒子上的大小，和合作者在他们的粒子上操作单个粒子的大小，州的接收装置能重建由使用适当单一的操作的发送者的原来的状态。在为切开 two-qubit 状态的计划，特别地，接收装置需要介绍一个辅助粒子并且执行一 C 不操作。

Remote preparation of a Greenberger-Horne-Zeilinger state via a two-particle entangled state

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.

Generation of a four-particle entangled state via cross-Kerr nonlinearity

We propose a scheme for generating a genuine four-particle polarisation entangled state ｜χ^00） that has many interesting entanglement properties and potential applications in quantum information processing. In our scheme, we use the weak cross-Kerr nonlinear interaction between field-modes and the non-demolition measurement method based on highly efficient homodyne detection, which is feasible under the current experiment conditions.

Probabilistic Teleportation of a Three-Particle GHZ State via Two Three-Particle Entangled W States

为从一个发送者移植一个未知三粒子的 GHZ 状态到二接收装置中的任何一个一个的电视的一个计划被建议。在这个计划，量隧道由 twonon-maximally 三粒子的纠缠的 W 状态组成。一个未知三粒子的 GHZ 状态能是如果发送者执行二概括 Bell-statemeasurements 和 Hadamard 操作，当也二接收装置之一介绍是组成电视的三个粒子移植了的期末考试之一的一个辅助粒子时，完美地，电视移植了概率的联盟者状态，当目标咬了，然后与辅助粒子动控制不的手术并且在另外的接收装置的简单大小的帮助下介绍适当单一的转变。单一的转变的 Allkinds 详细被给。现在的计划可以直接被概括到电视港口一未知多，经由二个三粒子的纠缠的 W 状态的粒子 GHZ 状态使用了著名计算机生产厂商他量隧道。

Quantum Secure Direct Communication with Four-Particle Genuine Entangled State and Dense Coding

A quantum secure direct communication scheme using dense coding is proposed.At first,the sender (Alice)prepares four-particle genuine entangled states and shares them with the receiver (Bob) by sending two particles in eachentangled state to him.Secondly,Alice encodes secret information by performing the unitary transformations on herparticles and transmits them to Bob.Finally,Bob performs the joint measurements on his particles to decode the secretinformation.The two-step security test guarantees the security of communication.

Classical Communication Cost and Probabilistic Remote Preparation of Four-Particle Entangled W State

我们在场为由把四个部分纠缠的二粒子的状态用作量隧道的四粒子的纠缠的 W 状态的概率的遥远的准备的一个计划。在这个计划，如果艾莉斯(发送者) 执行四粒子的射影的大小，鲍勃(接收装置) 采用一些，拨出单一的操作，遥远的州的准备能成功地与某些概率被认识到。古典通讯费用也是计算的。然而，准备的成功概率能为四种特殊状态被增加到 1。

Scheme for probabilistic remotely preparing a multi-particle entangled GHZ state

This paper presents a scheme for probabilistic remote preparation of a three-particle entangled Greenberger-Horne-Zeilinger （GHZ） state via three-particle orthonormal basis projective measurement, and then directly generalize the scheme to multi-particle case. It is shown that by using N pairs of bipartite non-maximally entangled states as the quantum channel and N-particle orthonormal basis projective measurement, the multi-particle remote preparation can be successfully realized with a certain probability.

Multiparty Quantum Secret Sharing via Introducing Auxiliary Particles Using a Pure Entangled State

我们建议经由介绍辅助粒子用分享协议的一个新多党的量秘密一 non-maximally 纠缠了(纯) 没有贝尔大小的二粒子的状态。通讯聚会利用圈套粒子检查偷听。在保证量隧道的安全以后，发送者编码秘密消息并且由使用把它传给接收装置控制 -- 不操作和 von Neumann 测量。如果并且仅当所有代理人同意协作，他们能读出秘密消息。

N—Particle Entangled States of Continuum Variables

We construct the n-particle entangled states |β>θ in n-mode Fock space, and examine their completeness relation and partly non-orthonormal property. Their Schmidt decomposition and entangled operator are manifestly shown. Finally, we discuss their application.

Probabilistic teleportation of an arbitrary three-particle state

A scheme for teleporting an arbitrary and unknown three-particle state from a sender to either one of two receivers is proposed. The quantum channel is composed of a two-particle non-maximally entangled state and two three-particle non-maximally entangled W states. An arbitrary three-particle state can be perfectly teleported probabilistically if the sender performs three generalized Bell-state measurements and sends to the two receivers the classical result of these measurements, and either one of the two receivers adopts an appropriate unitary transformation conditioned on the suitable measurement outcomes of the other receiver. All kinds of unitary transformations are given in detail.

Teleportation of an Arbitrary Three-Particle State via Three EPR Pairs

A scheme of teleportation of an arbitrary three-particle state is presented when three pairs of entangled particles are used as quantum channels. After the Bell state measurements are operated by the sender, the original state with deterministic probability can be reconstructed by the receiver when a corresponding unitary transformation is followed.

Teleportation of a Three—Particle state via Entanglement Swapping

A scheme for teleporting a three-particle state is proposed when three pairs of entang]ed particles are used as quantum channel. After a sender operates the Bell-state measurement, the original state with deterministic probability can be reconstructed when the receiver performs a corresponding measurement with unitary transformation.

A new representation and probabilistic teleportation of an arbitrary and unknown N-particle state

A new representation of an arbitrary and unknown N-particle state is presented at first. As an application, a scheme for teleporting an arbitrary and unknown N-particle state is proposed when N pairs of two-particle non- maximally entangled states are utilized as quantum channels. After Alice （sender） makes Bell-state measurement on her particles, Bob （recipient） introduces an auxiliary particle and carries out appropriate unitary transformation on his particle and the auxiliary particle depending on classical information from Alice. Then, von Neumann measurement that confirms whether the teleportation succeeds or not is performed by Bob on the auxiliary particle. In order to complete the teleportation, another N-1 times operations need to be performed which are similar to the above ones. It can be successfully realized with a certain probability which is determined by the product of the smaller coefficients of non-maximally entangled pairs. All possible unitary transformations are given in detail.