Three Schools' 2019 International Exchange Outbound Program: Fall – Winter cohort returns

My professor in Madrid called Gonzalo was a very kind and passionate person. We had several seminars to discuss my research topic during my stay, after which I decided my research topic: How Culture Diversity impacts on Open Innovation in China, Japan and Europe Union. We set up the goal that, at the end of my stay, I will submit a paper about this topic. I worked with other members in the lab and also held a seminar with Gonzalo every two weeks to make sure my paper was heading in the right direction. At the end he was very satisfied with my paper. My major at Tokyo Institute of Technology focuses on customer satisfaction, and there were few related courses to choose from in Madrid, so Gonzalo helped me register for a business course in the university. I was able to study with students from all over the Europe, and I learned a lot through this program.

At first, I thought a four-month study would give me plenty of time to spend but time flies so fast. Treasure your stay there if you get a chance to do the exchange program. I not only gained the skills of speaking Spanish fluently but also got more insights on my research. More importantly, I made new friends from all over Europe and other Asian countries. It was really a great experience not only for study but also for life. Take advantage of this great opportunity to go to a country that interests you and start enriching your life.

For spin-based quantum computation, readout of spin state is the first and the most important step. There are some techniques to be deployed: Charge sensor, radiofrequency quantum point contact (rf-QPC), radiofrequency single-electron transistor (rf-SET), dispersive readout, and capacitive gate-based sensing.

A single quantum dot (QD) located nearby a double quantum dot (DQD) is used as a charge sensor. This method is what my laboratory mostly used for metal-oxide-semiconductor (MOS) DQD devices until last year. Although this technique gives reliable results, it is not as fast a measurement as radiofrequency the single electron transistor (rf-SET) which is another technique for readout of spin state.

Hitachi Cambridge Laboratory is a pioneer in radio frequency (RF) capacitive gate-based sensing techniques. During my period of stay, I fulfilled what I aimed for before joining that group. First, I learned the theory of gate-based sensing both at the device level and at the circuit level. Second, I understood how to design a PCB compatible with gate-based sensing. Third, I tested a superconducting inductor (classical inductors are not very suitable at cryogenic temperature). Finally, I contributed to current gate-based sensing measurements to learn the measurement set-up. During all these activities, I performed experiments with David Ibberson who is a third-year doctoral student under the supervision of Dr. Fernando Gonzalez-Zalba.

In terms of research, I had the opportunity to enjoy my stay. I also visited Oxford, which is very close to Cambridge, and hung out with my friends from the laboratory. To put all in a nutshell, it was a great opportunity and experience for me.