论文标题
连贯的随机基准测试
Coherent randomized benchmarking
论文作者
论文摘要
随机基准测试是一种有效估计量子门，电路和设备的性能和可靠性的强大技术。在这里，我们建议以连贯的方式进行随机基准测试，其中使用了不同随机序列而不是独立样本的叠加。我们表明，这导致了一个统一而简单的协议，就可以基准测试以及效率和可扩展性而言的门具有显着优势。我们表明，例如环球门（Universal Gate Sets）是$ n- $ qudit Pauli运营商的集合或包括任意Unitaries（包括任意校园的）以及仅使用Pauli Set的特定$ n- $ qudit Clifford Gate（包括任意单位）的套装。支付的价格是增加控制量量子操作的额外复杂性。但是，我们证明这可以通过使用自然在任何物理实现中自然可用的辅助自由度来完成，并且独立于要测试的大门。
Randomized benchmarking is a powerful technique to efficiently estimate the performance and reliability of quantum gates, circuits and devices. Here we propose to perform randomized benchmarking in a coherent way, where superpositions of different random sequences rather than independent samples are used. We show that this leads to a uniform and simple protocol with significant advantages with respect to gates that can be benchmarked, and in terms of efficiency and scalability. We show that e.g. universal gate sets, the set of $n-$qudit Pauli operators or more general sets including arbitrary unitaries, as well as a particular $n-$qudit Clifford gate using only the Pauli set, can be efficiently benchmarked. The price to pay is an additional complexity to add control to the involved quantum operations. However we demonstrate that this can be done by using auxiliary degrees of freedom that are naturally available in basically any physical realization, and are independent of the gates to be tested.
