AI 中文总结
研究基于振幅放大的腔量子电动力学相干控制技术，在光学腔平台改进单光子产生协议长度缩放并降误差，在超导量子比特与微波腔耦合平台用定点振幅放大得制备福克态协议及NOON态制备协议。
AI 中文摘要
在这项工作中，我们开发了一种基于振幅放大的腔量子电动力学相干控制技术。考虑了两个物理平台。第一个平台中，研究了与单模光学腔耦合的三能级量子发射器，基于遗忘振幅放大提出产生单光子的协议，改进了协议长度缩放，还降低了腔本征损耗误差。第二个平台中，在电路量子电动力学架构的色散区域，用定点振幅放大得到制备福克态的协议，其长度为\(O(n^{1/4})\)，还描述了制备NOON态的协议。
英文摘要
In this work, we develop a coherent control technique for cavity QED based on amplitude amplification. We consider two physical platforms. In the first setting, we study a three-level quantum emitter coupled to a single mode of an optical cavity and introduce a protocol for producing traveling single photons based on oblivious amplitude amplification. As the key ingredient of our protocol, we propose an extension of oblivious amplitude amplification which uses reflection unitaries solely on the signal qubit, along with $U$ and $U^\dagger$, where the unitary $U$ prepares the initial state. Our approach improves the scaling of the single-photon-generation protocol length from $N\sim 1/p$ to $N\sim 1/\sqrt{p}$, with $p$ denoting the success probability of obtaining a short single photon from a single application of the weak control pulse. Furthermore, our protocol also reduces the error from intrinsic cavity loss compared to protocols using a single strong control pulse in various experimentally relevant regimes, suggesting the application of our methods for error reduction. In the second setting, we consider a superconducting qubit coupled to a single bosonic mode of a microwave cavity in a circuit QED architecture in the dispersive regime for preparing Fock states. Using fixed-point amplitude amplification, we obtain a protocol for preparing Fock states whose length scales as $O(n^{1/4})$, where $n$ is the number of photons. Additionally, as an application of our methods for state preparation, we describe a protocol for preparing NOON states.
Comments14 pages, 9 figures
