We consider testing the ability of quantum network nodes to execute multi-round quantum protocols. Specifically, we examine protocols in which the nodes are capable of performing quantum gates, storing qubits and exchanging said qubits over the network a certain number of times. We propose a simple ping-pong test, which provides a certificate for the capability of the nodes to run certain multi-round protocols. We first show that in the noise-free regime the only way the nodes can pass the test is if they do indeed possess the desired capabilities. We then proceed to consider the case where operations are noisy, and provide an initial analysis showing how our test can be used to estimate parameters that allow us to draw conclusions about the actual performance of such protocols on the tested nodes. Finally, we investigate the tightness of this analysis using example cases in a numerical simulation.

中文翻译：

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量子网络阶段的功能认证

我们考虑测试量子网络节点执行多轮量子协议的能力。具体来说，我们检查协议，其中节点能够执行量子门，存储量子位并在网络上交换一定数量的所述量子位。我们提出了一个简单的乒乓测试，该测试为节点运行某些多轮协议的能力提供了一个证书。我们首先表明，在无噪声的情况下，节点能够通过测试的唯一方法是它们是否确实具有所需的功能。然后，我们继续考虑操作嘈杂的情况，并提供初始分析，以显示如何使用我们的测试来估计参数，从而使我们能够得出有关此类协议在被测节点上的实际性能的结论。最后，