论文标题
有效的空腔控制与快照大门
Efficient cavity control with SNAP gates
论文作者
论文摘要
与超导Qubits结合的微波腔已被证明是量子信息处理的有前途的平台。这种设置的主要挑战是实现对腔的普遍控制。有希望的方法是选择性依赖数的任意阶段（SNAP）门与空腔位移相结合。已经证明，这是一个通用门集，但是到目前为止，一个中心问题仍然开放：如何通过这些操作的序列有效地实现给定的目标操作。在这项工作中，我们提出了一个解决此问题的实用计划。它涉及将新门插入序列中的层次策略，然后将控制参数的共选式化，该控制参数产生了短的高效率序列。对于广泛的实验相关应用，我们发现它们可以用3到4个快照大门实施，而先前已知的技术最多可以使用50个。
Microwave cavities coupled to superconducting qubits have been demonstrated to be a promising platform for quantum information processing. A major challenge in this setup is to realize universal control over the cavity. A promising approach are selective number-dependent arbitrary phase (SNAP) gates combined with cavity displacements. It has been proven that this is a universal gate set, but a central question remained open so far: how can a given target operation be realized efficiently with a sequence of these operations. In this work, we present a practical scheme to address this problem. It involves a hierarchical strategy to insert new gates into a sequence, followed by a co-optimization of the control parameters, which generates short high-fidelity sequences. For a broad range of experimentally relevant applications, we find that they can be implemented with 3 to 4 SNAP gates, compared to up to 50 with previously known techniques.
