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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

Na Chen, Quan Dongxiao, Yang Hong, Pei Changxing

Published Dec 1, 2015• 6 citations
Publisher
DOI
10.1016/s1005-8885(15)60692-6

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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.

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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。

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Quantum Teleportation via Hybrid Entangled States

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Probabilistic Teleportation of a Three-particle GHZ State Via a Partial Threeparticle GHZ State

Rong‐Can Yang

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.

Journal of Fujian Normal University•Jan 1, 2007•0 citations
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.
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。
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.