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Improvement on cyclic controlled teleportation by using a seven-qubit entangled state
Optical and Quantum Electronics ( IF 3 ) Pub Date : 2021-07-22 , DOI: 10.1007/s11082-021-03098-1
Vikram Verma 1 , Dhiraj Yadav 2 , Devendra Kumar Mishra 2
Affiliation  

Recently, Sang [Int. J. Theor. Phys. 57, 3835–3838 (2018)] proposed a scheme for cyclic controlled quantum teleportation (CYCQT) of three arbitrary single-qubit states by utilizing a seven-qubit entangled state as the quantum channel shared by the four parties Alice, Bob, Charlie and David. In this scheme, single-qubit state is teleported by Alice to Bob, Bob teleports his single-qubit state to Charlie and Charlie teleports his single-qubit state to Alice. It is claimed that all the three participants Alice, Bob and Charlie cannot reconstruct the desired teleported state without the help of the controller David. Contrary to this, we show that the two involved participants Alice and Charlie can reconstruct the desired teleported state without the permission of controller. The controller David has no control over the teleportation processes Bob to Charlie and Charlie to Alice. To resolve this issue, we propose a modification to Sang’s scheme for CYCQT. Our scheme may play an important for secure quantum communication among the quantum nodes of a quantum network.



中文翻译:

利用七量子比特纠缠态改进循环控制隐形传态

最近,桑[Int. J. 理论。物理。57, 3835–3838 (2018)] 提出了一种通过利用七量子位纠缠态作为由 Alice、Bob、Charlie 和 David 四个方共享的量子通道来实现三个任意单量子位态的循环受控量子隐形传态 (CYCQT) 的方案. 在这个方案中,Alice 将单量子位状态传送给 Bob,Bob 将他的单量子位状态传送给 Charlie,而 Charlie 将他的单量子位状态传送给 Alice。据称,如果没有控制器 David 的帮助,Alice、Bob 和 Charlie 的所有三个参与者都无法重建所需的传送状态。与此相反,我们展示了两个参与的参与者 Alice 和 Charlie 可以在没有控制器许可的情况下重建所需的传送状态。控制器 David 无法控制 Bob 到 Charlie 和 Charlie 到 Alice 的传送过程。为了解决这个问题,我们建议修改 Sang 的 CYCQT 方案。我们的方案可能对量子网络的量子节点之间的安全量子通信起到重要作用。

更新日期:2021-07-22
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