标题： 量子通信协议作为量子计算机的基准 显示英文标题

标题： Quantum communication protocols as a benchmark for quantum computers

摘要： 我们指出，在可编程量子计算机中实现量子通信协议为真实量子硬件的能力提供了深入的基准测试。特别是，专注于性能的基于熵的特征测量，并探索是否保持了“量子区域”是很有前景的。我们使用IBM Quantum Experience的5-和16量子比特超导量子处理器进行了超密编码和量子密钥分发BB84的原理验证实现。我们关注这些量子机器通过将爱丽丝和鲍勃放置在设备的不同量子比特上来在处理器的远距离部分之间提供高效的信息传输能力。我们还检查了量子设备作为量子存储器以及存储用于量子通信的纠缠态的能力。我们解决的另一个问题是错误缓解。尽管这与基准测试相矛盾，但这个问题在使用噪声量子设备的量子计算一般背景下仍然很重要。我们进行了这种缓解，并显著改善了一些结果。 显示英文摘要

摘要： We point out that realization of quantum communication protocols in programmable quantum computers provides a deep benchmark for capabilities of real quantum hardware. Particularly, it is prospective to focus on measurements of entropy-based characteristics of the performance and to explore whether a "quantum regime" is preserved. We perform proof-of-principle implementations of superdense coding and quantum key distribution BB84 using 5- and 16-qubit superconducting quantum processors of IBM Quantum Experience. We focus on the ability of these quantum machines to provide an efficient transfer of information between distant parts of the processors by placing Alice and Bob at different qubits of the devices. We also examine the ability of quantum devices to serve as quantum memory and to store entangled states used in quantum communication. Another issue we address is an error mitigation. Although it is at odds with benchmarking, this problem is nevertheless of importance in a general context of quantum computation with noisy quantum devices. We perform such a mitigation and noticeably improve some results.