论文标题
与连续变化的纠缠的混合纠缠状态的传送
Teleportation of Hybrid Entangled States with Continuous-Variable Entanglement
论文作者
论文摘要
离散变量（DV）和连续变量（CV）量子系统之间的混合纠缠是异质量子网络的重要资源。我们先前的工作表明，在有损失的渠道中，通过CV键入状态的DV量子位传送，可以通过发件人的修改钟状态测量定义的新协议可显着改善。这项工作探讨了一种新的，类似的，基于简历的传送协议是否可以改善混合纠缠状态的转移。为了设置场景，我们首先确定了仅传送CV量子A的这种修改协议的性能，这表明获得了基于传统CV的传送的显着改善。然后，我们在特定的混合纠缠状态的传送中探索类似的修改，表明再次发现了基于传统的CV传送的显着改善。对于给定的频道损失，我们发现杂交纠缠状态的DV量子始终可以实现比传送CV量子量的更高的保真度。然后，我们探讨了在我们的修改后的传送协议中使用各种非高斯操作的使用，发现量子剪刀以较低的成功概率为代价，量子剪刀在损失公差方面提供了最大的改善。我们的新结果强调，在有损条件下，在发件人处进行的量子测量可能会对基于简历的传送产生令人惊讶和巨大的影响。
Hybrid entanglement between discrete-variable (DV) and continuous-variable (CV) quantum systems is an essential resource for heterogeneous quantum networks. Our previous work showed that in lossy channels the teleportation of DV qubits, via CV-entangled states, can be significantly improved by a new protocol defined by a modified Bell state measurement at the sender. This work explores whether a new, similarly modified, CV-based teleportation protocol can lead to improvement in the transfer of hybrid entangled states. To set the scene, we first determine the performance of such a modified protocol in teleporting CV-only qubits, showing that significant improvement over traditional CV-based teleportation is obtained. We then explore similar modifications in the teleportation of a specific hybrid entangled state showing that significant improvement over traditional CV-based teleportation is again found. For a given channel loss, we find teleporting the DV qubit of the hybrid entangled state can always achieve higher fidelity than teleporting the CV qubit. We then explore the use of various non-Gaussian operations in our modified teleportation protocol, finding that, at a cost of lower success probability, quantum scissors provides the most improvement in the loss tolerance. Our new results emphasize that in lossy conditions, the quantum measurements undertaken at the sender can have a surprising and dramatic impact on CV-based teleportation.
