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理论物理通讯：英文版

Standard Teleportation of One-Qubit State and Partial Teleportation of Two-Qubit State via X-States

秦猛, 徐胜龙, 翟孝月

Published Jan 1, 2012• 0 citations
OpenAlex

Abstract

在这篇文章，我们导出明确的纠纷和忠实表情因为也就是， two-qubit 的一个更大的班说那么叫的 X 状态的一个七参数的家庭。纠纷，输出纠纷和平均忠实的分析表达式被使用同时发生和平均忠实的概念为这个一般模型获得。我们为 one-qubit 的标准远距传物和 two-qubit 状态的部分远距传物学习在量纠纷，产量纠纷，和平均忠实之间的关系。我们发现平均忠实和纠纷不是一种简单依赖关系。更高纠缠的系统对远距传物有用。

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在这篇文章，我们导出明确的纠纷和忠实表情因为也就是， two-qubit 的一个更大的班说那么叫的 X 状态的一个七参数的家庭。纠纷，输出纠纷和平均忠实的分析表达式被使用同时发生和平均忠实的概念为这个一般模型获得。我们为 one-qubit 的标准远距传物和 two-qubit 状态的部分远距传物学习在量纠纷，产量纠纷，和平均忠实之间的关系。我们发现平均忠实和纠纷不是一种简单依赖关系。更高纠缠的系统对远距传物有用。
为电视移植的一个简单计划一个未知 M-qubit 像猫的状态被建议。这个计划的步骤能简单地被总结：disentangle-teleport-reconstruct 纠纷。如果从发送者的合适的单一的操作和大小被给，一个未知 M-qubit 像猫的状态的远距传物能被变换成单个 qubit 远距传物。同时，接收装置应该也与适当辅助 qubits 的介绍执行恰好单一的操作证实要求的纠缠的状态的成功的远距传物。现在的计划能被概括到电视港口一个未知 M-quNit 状态，即，一个 M-quNit 状态能是单个 quNit 移植的电视纠缠的对。
In this article, we derive the explicit entanglement and fidelity expressions for a larger class of two-qubit states, namely, a seven-parameter family of so called X-states. The analytical expressions of the entanglement, the output entanglement and the average fidelity are obtained for this general model by using the concept of concurrence and average fidelity. We study the relations between quantum entanglement, the output entanglement, and the average fidelity for standard teleportation of one-qubit and partial teleportation of two-qubit state. We discover that the average fidelity and entanglement is not a simple dependence relation. The higher entangled system is helpful for teleportation.
我们建议一个方法认识到由许多 qudits 组成通过的一个未知纠缠的状态的远距传物一部分在 2log (2 ) 的帮助下的 entangled-qudit 量隧道 d 小点古典通讯。在远距传物过程使用的操作包括概括钟状态大小和艾莉斯，执行的一系列 single-qudit pi 测量一系列概括 qudit 泡利不相容原理门和二水平的单一的门，以及 qubitmeasurement 由鲍勃表现了。因为一个格言联盟者纠缠了量隧道，远距传物的成功的概率变得联合起来。
Is this paper we mainly investigate the effects of the temperature and Josephson energy on teleportation of one qubit state in both the standard and the non-standard protocols as well as the partial teleportation of an entangled state under the standard protocol via two identical superconducting charge qubits in thermal equilibrium as the teleportation channel, and give the analytical expression of the average fidelity. Our results show that the teleportation of one qubit state in non-standard protocol and the partial teleportation of entanglement in standard protocol can be almost perfect, indicating that quantum teleportation, with using superconducting charge qubits in thermal equilibrium as a quantum channel, is feasible in theory.
parameters, in the presence of the Unruh effect experienced by a mode of a free Dirac field. We investigate the effects of the partial measurement (PM) and partial measurement reversal (PMR) on the quantum resources and quantum Fisher information (QFI) of the teleported states. In particular, we discuss the optimal behaviour of the QFI, quantum coherence (QC) as well as fidelity with respect to the PM and PMR strength and examine the effect of the Unruh noise on optimal estimation. It is found that, in the single-qubit scenario, the PM (PMR) strength at which the optimal estimation of the phase parameter occurs is the same as the PM (PMR) strength with which the teleportation fidelity and the QC of the teleported single-qubit state reaches its maximum value. On the other hand, generalizing the results to two-qubit teleportation, we find that the encoded information in the weight parameter is better protected against the Unruh noise in two-qubit teleportation than in the one-qubit scenario. However, extraction of information encoded in the phase parameter is more efficient in single-qubit teleportation than in the two-qubit version.