摘要
量子操控远程实现是量子通信重要任务之一,最近,基于量子纠缠信道的非定域量子门引起了广泛关注.基于不同信道提出了双量子比特控制非门,三量子比特Toffoli门远程实现方案.本文研究信道联合噪声下基于部分纠缠信道的三粒子非定域Toffoli门远程实现方案,提出了两个非最大纠缠信道下可克制信道联合噪声的非定域Toffoli门远程实现方案.一个方案用于联合退相位噪声下基于部分纠缠信道的非定域Toffoli门远程实现,另一个用于联合转动噪声下非定域Toffoli门远程实现.通信方先使用退相干无关子空间克制信道联合噪声影响,再通过引入附加粒子和执行联合幺正演化消除部分纠缠信道对非定域Toffoli门远程实现影响.通讯方仅需使用部分纠缠态来实现非定域量子门,与其他方案相比,具有可行性强的优点.
Remote implementation of nonlocal quantum gates is one of the central tasks in quantum communication. Researchers devote much interest in remote implementation of nonlocal quantum gates via quantum entangled channel. Remote implementation protocols of two-qubit controlled-not gate, three-qubit Toffoli gate have been presented. We present two schemes for remote implementation of nonlocal Toffoli gate via partially entangled quantum channel against collective noise. The first is used to remote implementing of nonlocal Toffoli gate via partially entangled channel against collectivedephasing noise, and the second is used to remote implementing of nonlocal Toffoli gate against collective-rotation noise.The schemes are tolerant of collective-dephasing noise and collective-rotating noise. The agents can implement the Toffoli gate nonlocally with partially entangled quantum channel by introducing an auxiliary qubit and performing general evolution. The schemes are more convenient in application since they only requires partially entangled quantum states for nonlocal implementation of quantum operations.
引文
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