Lin, Wei-JuWei-JuLinLu, YongYongLuWen, Ping YiPing YiWenCheng, Yu-TingYu-TingChengLee, Ching-PingChing-PingLeeLin, Kuan TingKuan TingLinChiang, Kuan HsunKuan HsunChiangHsieh, Ming CheMing CheHsiehChen, Ching-YehChing-YehChenChien, Chin-HsunChin-HsunChienLin, Jia JhanJia JhanLinChen, Jeng-ChungJeng-ChungChenLin, Yen HsiangYen HsiangLinChuu, Chih-SungChih-SungChuuNori, FrancoFrancoNoriFrisk Kockum, AntonAntonFrisk KockumGUIN-DAR LINDelsing, PerPerDelsingHoi, Io-ChunIo-ChunHoi2022-12-162022-12-162022-10-261530-6984https://scholars.lib.ntu.edu.tw/handle/123456789/626550Loading quantum information deterministically onto a quantum node is an important step toward a quantum network. Here, we demonstrate that coherent-state microwave photons with an optimal temporal waveform can be efficiently loaded onto a single superconducting artificial atom in a semi-infinite one-dimensional (1D) transmission-line waveguide. Using a weak coherent state (the number of photons (N) contained in the pulse ≪1) with an exponentially rising waveform, whose time constant matches the decoherence time of the artificial atom, we demonstrate a loading efficiency of 94.2% ± 0.7% from 1D semifree space to the artificial atom. The high loading efficiency is due to time-reversal symmetry: the overlap between the incoming wave and the time-reversed emitted wave is up to 97.1% ± 0.4%. Our results open up promising applications in realizing quantum networks based on waveguide quantum electrodynamics.enQuantum network; photon loading; superconducting artificial atom; waveguide quantum electrodynamics; Quantum Physics; Quantum Physicsjournal article10.1021/acs.nanolett.2c02578362009862-s2.0-85139552451WOS:000866281700001http://arxiv.org/abs/2012.15084v1