论文标题
在超导电路上编码的强大而快速的自动量子门
Robust and Fast Holonomic Quantum Gates with Encoding on Superconducting Circuits
论文作者
论文摘要
高保真性和稳健的量子操作是可扩展量子计算的关键。因此，由于固有的操作鲁棒性，几何阶段引起的量子操作是有前途的候选者之一。但是，几何操作的较长时间和更多的身体实施困难阻碍了其实际和广泛的应用。在这里，我们提出了通过实验证明的技术在超导电路上简化实施的通用自动量子门，可以通过将时间优势控制到量子门的构造中来消除这两个主要挑战。值得注意的是，我们的方案还基于使用最少的物理量子空间资源的无腐蚀子空间编码，这可以进一步免疫由Qubit频率漂移引起的误差，这被认为是大规模超导电路的主要误差源。同时，我们故意设计量子演变，以消除由不必要的泄漏来源引起的门错误。因此，我们的方案比常规方案更强大，因此为可扩展的易于断层量子计算提供了有希望的替代策略。
High-fidelity and robust quantum manipulation is the key for scalable quantum computation. Therefore, due to the intrinsic operational robustness, quantum manipulation induced by geometric phases is one of the promising candidates. However, the longer gate time for geometric operations and more physical-implementation difficulties hinder its practical and wide applications. Here, we propose a simplified implementation of universal holonomic quantum gates on superconducting circuits with experimentally demonstrated techniques, which can remove the two main challenges by introducing the time-optimal control into the construction of quantum gates. Remarkably, our scheme is also based on a decoherence-free subspace encoding, with minimal physical qubit resource, which can further immune to error caused by qubit-frequency drift, which is regarded as the main error source for large scale superconducting circuits. Meanwhile, we deliberately design the quantum evolution to eliminate gate error caused by unwanted leakage sources. Therefore, our scheme is more robust than the conventional ones, and thus provides a promising alternative strategy for scalable fault-tolerant quantum computation.
