Theory of microwave single-photon detection using an impedance-matched Λ system
Theory of microwave single-photon detection using an impedance-matched Λ system
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DOI：
10.1103/physreva.91.043805
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发表时间：
2015-01
影响因子：
2.9
通讯作者：
K. Koshino;K. Inomata;Zhirong Lin;Yasunobu Nakamura;Tsuyoshi Yamamoto
中科院分区：
文献类型：
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作者：
K. Koshino;K. Inomata;Zhirong Lin;Yasunobu Nakamura;Tsuyoshi Yamamoto
通过适当地驱动强色散制度中的量子比特谐振器系统，我们实现了“阻抗匹配”$\Lambda$系统中的修饰状态，其中共振单光子确定性地诱导拉曼跃迁并激发量子比特。结合这种效应和量子比特的快速色散读出，我们实现了巡游微波光子的探测器。我们从理论上分析了$\Lambda$系统的单光子响应，并评估其作为探测器的性能。我们实现了一个高的检测效率接近统一，而不依赖于精确的时间控制的输入脉冲形状和保守的估计下的系统参数。探测器还可以通过施加微波脉冲快速复位，这允许短的死区时间和高重复率。
By properly driving a qubit-resonator system in the strong dispersive regime, we implement an "impedance-matched" $\Lambda$ system in the dressed states, where a resonant single photon deterministically induces a Raman transition and excites the qubit. Combining this effect and a fast dispersive readout of the qubit, we realize a detector of itinerant microwave photons. We theoretically analyze the single-photon response of the $\Lambda$ system and evaluate its performance as a detector. We achieve a high detection efficiency close to unity without relying on precise temporal control of the input pulse shape and under a conservative estimate of the system parameters. The detector can also be reset quickly by applying microwave pulses, which allows a short dead time and a high repetition rate.