论文标题
快速读数和重置与固有purcell滤波器耦合到谐振器的超导量子
Fast readout and reset of a superconducting qubit coupled to a resonator with an intrinsic Purcell filter
论文作者
论文摘要
耦合谐振器与超导量子轴耦合，可以在Qubit上进行各种操作，包括分散读数和无条件重置。这些操作的速度受到谐振器的外部衰减率的限制。但是，提高衰减速率也会通过谐振器提高量子衰减的速率，从而限制了量子寿命。在这里，我们证明可以通过利用谐振器的分布式元素多模式性质来抑制谐振器介导的二极管衰减。我们表明，在600 MHz的带宽上，抑制超过两个数量级。我们使用此“固有的purcell滤波器”来证明40 ns读数，其保真度为99.1％，而剩余激发小于1.7％。
Coupling a resonator to a superconducting qubit enables various operations on the qubit, including dispersive readout and unconditional reset. The speed of these operations is limited by the external decay rate of the resonator. However, increasing the decay rate also increases the rate of qubit decay via the resonator, limiting the qubit lifetime. Here, we demonstrate that the resonator-mediated qubit decay can be suppressed by utilizing the distributed-element, multi-mode nature of the resonator. We show that the suppression exceeds two orders of magnitude over a bandwidth of 600 MHz. We use this "intrinsic Purcell filter" to demonstrate a 40-ns readout with 99.1% fidelity and a 100-ns reset with residual excitation of less than 1.7%.
