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arXiv 2202.00841quant-ph
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离散变量量子比特在连续变量有耗信道中的隐形传送

On the Teleportation of Discrete Variable Qubits Via Continuous Variable Lossy Channels

Mingjian He, Robert Malaney, Ryan Aguinaldo

摘要:

光的连续变量(CV)量子态允许传送离散变量(DV)光子量子比特。这样的操作在混合量子网络领域是有用的。然而,已知的是,经由高斯CV资源信道的DV量子比特的隐形传态在信道损耗下受到严重限制,其中对于超过0.5dB的小阈值的损耗,隐形传态保真度超过经典极限是不可达到的。在这项工作中,我们提出了一个新的非确定性隐形传态协议,结合了高斯CV资源信道与修改形式的贝尔状态测量,可容纳DV量子比特保真度超过经典的限制,信道损耗高达20 dB。除了这个数量级的改善,我们还展示了如何使用非高斯操作的CV资源通道可以导致一个DV量子比特保真度接近统一的任何通道损失。

英文摘要:

The Continuous-Variable (CV) quantum state of light allows for the teleportation of a Discrete-Variable (DV) photonic qubit. Such an operation is useful in the realm of hybrid quantum networks. However, it is known that the teleportation of a DV qubit via a Gaussian CV resource channel is severely limited under channel loss, with a teleportation fidelity beyond the classical limit unattainable for losses exceeding a small threshold of 0.5 dB. In this work, we present a new non-deterministic teleportation protocol that combines a Gaussian CV resource channel with a modified form of the Bell State Measurement that accommodates a DV-qubit fidelity beyond the classical limit for channel losses up to 20~dB. Beyond this orders of magnitude improvement, we also show how the use of non-Gaussian operations on the CV resource channel can lead to a DV-qubit fidelity approaching unity for any channel loss.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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