AQP Seminar: On-chip coherent microwave source

Aalto Quantum Physics Seminar (Nanotalo). Speaker: Dr. Chengyu Yan (Department of Applied Physics, Aalto University)

Microwave has played an important role in different fields, one of the most noticeable examples is the operation of qubit. Usually, the microwave tone is generated by a commercial microwave source that operates at room temperature, and then carefully filtered and attenuated before it reaches the device such as qubit. With the ever-growing complexity of the quantum system, the management of the microwave tone becomes one of the leading factors that restrict the scalability of the system. An on-chip microwave is therefore highly demanded. In this talk, I will present the latest results about the on-chip microwave source consisting of a Josephson junction and spiral resonator, developed as a joint effort of QCD group and VTT. The microwave source can generate a coherent signal with an amplitude at least an order larger compared to previous reports. Lasing behavior is observed with injection locking.