Modulation of energy spectrum and control of coherent microwave transmission at single-photon level by longitudinal field in a superconducting quantum circuit<xref rid="cpb_27_7_074206fn1" ref-type="fn">*</xref><fn id="cpb_27_7_074206fn1"> <label>*</label><p>Project supported by the Ministry of Science and Technology of China (Grant Nos. 2014CB921401, 2017YFA0304300, 2014CB921202, and 2016YFA0300601), the National Natural Science Foundation of China (Grant No. 11674376), and the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB07010300).</p></fn>

Modulation of energy spectrum and control of coherent microwave transmission at single-photon level by longitudinal field in a superconducting quantum circuit* *

Project supported by the Ministry of Science and Technology of China (Grant Nos. 2014CB921401, 2017YFA0304300, 2014CB921202, and 2016YFA0300601), the National Natural Science Foundation of China (Grant No. 11674376), and the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB07010300).

Guo Xueyi^{1, 2}, Deng Hui¹, Li Hekang^{1, 2}, Song Pengtao^{1, 2}, Wang Zhan^{1, 2}, Su Luhong^{1, 2}, Li Jie¹, Jin Yirong^{1, †}, Zheng Dongning^{1, 2, ‡}

(color online) Dynamic control of the transmittance of single-photon level coherent microwave with LFM pulse. Incident microwave is at frequency 5.779 GHz. We apply a calibrated 1 μs LFM pulse and measure the response of S₂₁. When the LFM is applied, the microwave is totally transmitted. Without LFM, the microwave is 80% reflected.