论文标题
低空电路验证的扩展标志小工具
Extended flag gadgets for low-overhead circuit verification
论文作者
论文摘要
标志验证技术可用于检测临界断层的量子误差校正。在这里，我们提出了标志验证技术的应用，以改善近期算法的后选择性性能。我们通过基于统一运算符的已知转换创建错误检测小工具来扩展构成标志的定义。对于Clifford或近莱利福德电路，可以选择这些统一的操作员进行控制的Pauli Gates，从而导致小工具只需要少数其他Clifford Gates。我们表明，此类标志可以在选择后提高电路保真度，最多可提高2倍，并证明它们在具有单Qubit的去极化噪声，串扰和两QQQUIT相干性过度旋转的误差模型上的有效性。
Flag verification techniques are useful in quantum error correction for detecting critical faults. Here we present an application of flag verification techniques to improving post-selected performance of near-term algorithms. We extend the definition of what constitutes a flag by creating error-detection gadgets based on known transformations of unitary operators. In the case of Clifford or near-Clifford circuits, these unitary operators can be chosen to be controlled Pauli gates, leading to gadgets which require only a small number of additional Clifford gates. We show that such flags can improve circuit fidelities by up to a factor of 2 after post selection, and demonstrate their effectiveness over error models featuring single-qubit depolarizing noise, crosstalk, and two-qubit coherent overrotation.
