Quantum gate-assisted teleportation in noisy environments:robustness and fidelity improvement  

作　　者：Sajede Harraz Jiaoyang Zhang Shuang Cong 

机构地区：[1]Department of Automation,University of Science and Technology of China,Hefei 230027,China

出　　处：《Communications in Theoretical Physics》2024年第1期36-48,共13页理论物理通讯（英文版）

基　　金：supported by the National Natural Science Foundation of China under grant no.61973290;Ministry of Science and Technology of P.R.China Program under the grant no.QN2022200007L。

摘　　要：Quantum teleportation as the key strategy for quantum communication requires pure maximally shared entangled states among quantum nodes.In practice,quantum decoherence drastically degrades the shared entanglement during entanglement distribution,which is a serious challenge for the development of quantum networks.However,most of the decoherence control strategies proposed thus far are either resource-intensive or time-consuming.To overcome this obstacle,we enable noise-resistant teleportation through a noisy channel with a limited number of qubits and without applying time-consuming weak measurements.We apply a quantum gate control unit consisting of a controlled NOT gate and a rotation gate after the original teleportation protocol is accomplished.Furthermore,we demonstrate that a teleportation fidelity of unity is attainable when environment-assisted measurement is added to the proposed teleportation protocol via quantum gates.Moreover,we present an entanglement distribution process by employing the designed quantum gate control unit followed by the deterministic standard teleportation protocol to improve teleportation fidelity by establishing improved shared entanglement.Our performance analysis indicates that the proposed teleportation schemes offer a competitive fidelity and success probability compared with the conventional schemes and a recent weak measurement-based teleportation protocol.

关 键 词：quantum communication quantum teleportation decoherence control quantum gate environment-assisted measurement 

分 类 号：O413[理学—理论物理]