超导量子比特的快速复位和自发发射抑制
Fast Reset and Suppressing Spontaneous Emission of a Superconducting Qubit
摘要：
在电路量子电动力学中，通过耦合腔的自发发射是量子比特的一个重要衰变通道。我们提出了一种电路设计，有效地消除了自发发射由于珀塞尔效应，同时保持强耦合到低Q腔。在很宽的频率范围内的测量量子位弛豫时间和电路模型的预测之间发现了很好的协议。使用快速（纳秒时间尺度）通量偏置的量子位，我们证明了在原位控制量子位寿命超过50倍。在120 ns内实现了99.9%保真度的量子比特复位。
英文摘要：
Spontaneous emission through a coupled cavity can be a significant decay channel for qubits in circuit quantum electrodynamics. We present a circuit design that effectively eliminates spontaneous emission due to the Purcell effect while maintaining strong coupling to a low-Q cavity. Excellent agreement over a wide range in frequency is found between measured qubit relaxation times and the predictions of a circuit model. Using fast (nanosecond time-scale) flux biasing of the qubit, we demonstrate in situ control of qubit lifetime over a factor of 50. We realize qubit reset with 99.9% fidelity in 120 ns.
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