Integrated and DC-powered superconducting microcomb

Author:

Wang Chen-Guang,Xu Wuyue,Li Chong,Shi Lili,Jiang Junliang,Guo Tingting,Yue Wen-Cheng,Li Tianyu,Zhang Ping,Lyu Yang-Yang,Pan Jiazheng,Deng Xiuhao,Dong YingORCID,Tu XuecouORCID,Dong SiningORCID,Cao Chunhai,Zhang LabaoORCID,Jia XiaoqingORCID,Sun Guozhu,Kang Lin,Chen JianORCID,Wang Yong-LeiORCID,Wang HuabingORCID,Wu PeihengORCID

Abstract

AbstractFrequency combs, specialized laser sources emitting multiple equidistant frequency lines, have revolutionized science and technology with unprecedented precision and versatility. Recently, integrated frequency combs are emerging as scalable solutions for on-chip photonics. Here, we demonstrate a fully integrated superconducting microcomb that is easy to manufacture, simple to operate, and consumes ultra-low power. Our turnkey apparatus comprises a basic nonlinear superconducting device, a Josephson junction, directly coupled to a superconducting microstrip resonator. We showcase coherent comb generation through self-started mode-locking. Therefore, comb emission is initiated solely by activating a DC bias source, with power consumption as low as tens of picowatts. The resulting comb spectrum resides in the microwave domain and spans multiple octaves. The linewidths of all comb lines can be narrowed down to 1 Hz through a unique coherent injection-locking technique. Our work represents a critical step towards fully integrated microwave photonics and offers the potential for integrated quantum processors.

Funder

National Natural Science Foundation of China

Publisher

Springer Science and Business Media LLC

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