fabrecation and measurement of transmon qubit

Superconducting qubit is considered to be an important component of quantum computer, and transman, as a kind of superconducting qubit, has been widely studied in recent ten years. we hope that through the research to fabrecate transmon qubit that have long coherent time, high fidelity and stability. we use aluminum to prepare transmon qubit and microwave resonators, use micro nano machining technology (such as electron beam lithography, photo lithography, evapreation， inductively coupled plasma etc.) to fabrecate qubit device. we use dilution refrigerator to make sure the device is measure in the tempreture of milli kelvin. we use microwave circuit to measure the transmon qubit. now life time of our transmon qubit is stablely more than 10 microsecond.