Fast readout and reset of a superconducting qubit coupled to a resonator with an intrinsic Purcell filter
Fast readout and reset of a superconducting qubit coupled to a resonator with an intrinsic Purcell filter
复制标题
DOI：
10.1103/physrevapplied.17.044016
复制
发表时间：
2022-02
期刊：
影响因子：
--
通讯作者：
Y. Sunada;S. Kono;J. Ilves;S. Tamate;T. Sugiyama;Y. Tabuchi;Yasunobu Nakamura
中科院分区：
文献类型：
--
作者：
Y. Sunada;S. Kono;J. Ilves;S. Tamate;T. Sugiyama;Y. Tabuchi;Yasunobu Nakamura
将谐振器耦合到超导量子位可以对量子位进行各种操作，包括色散读出和无条件重置。这些操作的速度受到谐振器的外部衰减率的限制。然而，增加衰减率也会增加通过谐振器的量子位衰减率，从而限制量子位的寿命。在这里，我们证明可以通过利用谐振器的分布式元件、多模特性来抑制谐振器介导的量子位衰减。我们表明，在 600 MHz 带宽内，抑制超过两个数量级。我们使用这种“固有 Purcell 滤波器”来演示保真度为 99.1% 的 40 ns 读数和残余激励小于 1.7% 的 100 ns 重置。
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%.