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中国邮电高校学报：英文版

Perfect quantum controlled teleportation via a novel three- particle partially entangled channel

Chen, Quan Quan, Dong-Xiao, Yang, Hong, Pei Pei, Changxing

Published Jan 1, 2015• 0 citations
OpenAlex

Abstract

最近李等。当在量的量隧道控制了远距传物，建议了特殊部分纠缠的状态服务，当在他们的计划有一些限制时。基于那，我们在场在这份报纸的可能的改进。我们构造对完美的控制远距传物合适的一个新奇三粒子的部分纠缠的状态。一个简单的量电路被设计获得这个状态。我们评估量从三个观点的控制远距传物：远距传物忠实，成功概率和控制器是力量。详细计算和模拟分析证明构造状态是为任意的 qubits 的控制远距传物的一条合适的隧道，统一远距传物忠实和 100% 成功概率能被完成。同时，只要隧道是，纠纷度等于到或比 3/4 大，控制器的力量能被保证。

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最近李等。当在量的量隧道控制了远距传物，建议了特殊部分纠缠的状态服务，当在他们的计划有一些限制时。基于那，我们在场在这份报纸的可能的改进。我们构造对完美的控制远距传物合适的一个新奇三粒子的部分纠缠的状态。一个简单的量电路被设计获得这个状态。我们评估量从三个观点的控制远距传物：远距传物忠实，成功概率和控制器是力量。详细计算和模拟分析证明构造状态是为任意的 qubits 的控制远距传物的一条合适的隧道，统一远距传物忠实和 100% 成功概率能被完成。同时，只要隧道是，纠纷度等于到或比 3/4 大，控制器的力量能被保证。
We analyze and evaluate perfect controlled teleportation via three-qubit entangled channels from the point of view of the controller. The key idea in controlled teleportation is that the teleportation is performed only with the participation of the controller. We calculate a quantitative measure of the controller's power and establish a lower bound on the control power required for controlled teleportation. We show that the maximally entangled Greenberger-Horne-Zeilinger state is a suitable channel for controlled teleportation of arbitrary single qubits---the controller's power meets the bound and the teleportation fidelity without the controller's permission is no better than the fidelity of a classical channel. We also construct partially entangled channels that exceed the bound for controlled teleportation of a restricted set of states called the equatorial states. We calculate the minimum entanglement required in these channels to exceed the bound. Moreover, we find that in these restricted controlled teleportation schemes, the partially entangled channels can outperform maximally entangled channels with respect to the controller's power. Our results provide an alternative perspective on controlled teleportation schemes and are of practical interest since we propose useful partially entangled channels.
一种三粒子的纠缠的状态作为未知的一个一个粒子的控制的量远距传物的量隧道被使用状态。未知的一个粒子状态在监督人的控制下面从发送者被传给接受者。在发送者做钟状态测量，监督人执行 von Neumann 测量以后，接受者在他从 thes ender 和监督人取决于古典信息的自己的粒子上执行单一的转变。如果监督人不同意合作，远距传物不能被接受者成功地完成。接受者和监督人的角色可以在这个计划被交换。因为发送者和监督人的操作的顺序可以被交换，仅仅简单的单一的转变被包括，计划灵活、可行。
当三粒子的一般 W 状态的 N 组作为量隧道被利用时，移植任意的 N 粒子和未知状态的电视的二个计划被建议。在第一个计划，量隧道被发送者和接受者分享。在发送者他的上的钟状态大小以后(她的) 粒子，接受者在他的上执行单一的转变(她的) 粒子。然后，接受者执行计算基础大小认识到远距传物。如果，接受者能与成功的远距传物的相等的最大的概率粒子序列在也上恢复状态他(她) 执行适当单一的转变。在第二个计划，量隧道被发送者，接受者和第三分享。在如果他们同意合作，发送者的钟状态大小和第三大小是计算基础大小以后，接受者将介绍辅助粒子并且执行适当单一的转变。最后，接受者执行计算基础大小完成远距传物。如果并且仅当第三同意与接受者合作，第二个计划能被认识到。
A scheme for teleporting an unknown three-particle GHZ state from a sender to either one of two receivers through a non-maximally three-particle entangled GHZ state as quantum channel is proposed.An unknown three-particle entangled state can be perfectly teleported probabilistically if the sender performs a generalized Bell-state measurement and the Hadamard operations while either one of two receivers introduces two additional particles,performs the controlled-not(C-not) operations and introduces an appropriate unitary transformation with the help of the other receiver's the Hadamard operation and simple measurement.The present scheme may be directly generalized to teleport an unknown k-particle GHZ state from a sender to either one of two receivers by using a partial entangled three-particle GHZ state as the quantum channel,introducing(k-1) additional qubits and performing(k-1) C-not operations.