In this interview, we talked to Roger Alfredo Kögler, a BERLIN QUANTUM Fellow based at Humboldt-Universität zu Berlin, who is working on generating non-classical states with quantum memory. His research aims to develop robust quantum information systems and enable synchronized quantum networks through advanced photonic technologies.
What inspired you to pursue a career in quantum physics?
Awareness was all it took for me to be fascinated by the applications of quantum mechanics. I was the first of my family to pursue science as a career, and by the time I began my studies in physics I barely had an idea of what a physicist actually does, let alone what quantum mechanics was really about. While advancing through the semesters, I had the opportunity to work with different scientific advisors, one of which was experienced in quantum information and quantum computing. After this first contact, I learned how the area was constantly growing and also noticed the emergence of the first companies dedicated to these fields. From then on, I was compelled to continue to learn about quantum technologies and followed my specializations accordingly.
Why did you choose to conduct your research in Berlin?
Just by chance. A few months before finishing my PhD, I was constantly looking for available positions without any specific geographical preference. I came across an online advertisement for a position here in Berlin. I was really interested in the project and found my background fitting to the task. I found out about the ongoing photonics and quantum research landscape after I was already here, which was a pleasant surprise.
What advantages does Berlin offer for quantum physics research compared to other cities or countries?
From research investments to different positions in industry, Berlin and other parts of Germany and Europe offer vast possibilities for personnel with a quantum physics background. From a Latin American perspective, I can see that here scientific careers are not only more valued but are also more varied.
Can you tell us about a current project or experiment you are working on?
My current efforts are in the direction of constructing the necessary tools for creating and characterizing complex quantum states of light in the continuous variables regime. In the long run, the objective is to have access to quantum states that enable the encoding of quantum information that is resilient against detrimental loss mechanisms inherent to photonic devices. Additionally, the interface of such states with quantum memories is essential for synchronized applications, such as quantum information distribution in quantum networks.
How does BERLIN QUANTUM and the Berlin research landscape support your work, and which resources are particularly helpful?
I am currently involved in two projects that are directly funded by BERLIN QUANTUM initiatives. In addition to the aforementioned project, we are working on the development of detection systems in collaboration with DIGALOG GmbH, an industrial partner from Berlin. Furthermore, I also participate in active collaboration with another BQ fellow, Julian K. Nauth, a PhD candidate in the group of Prof. Jens Eisert. From my experience, the initiative has been completely successful in bringing together different partners in the development of quantum technologies.
What role does collaboration with other scientists and institutions in Berlin play in your research?
When I first arrived in Berlin, I could already tell that active collaboration between institutions plays a significant role in Germany. Personally, I found it refreshing. During the period that I am here, I could participate in different joint research topics together with different groups from Humboldt University and also together with other institutions, some of which are already bringing interesting results. Not only is it productive, but working with different people tends to be a lot of fun.
How does living in Berlin influence your personal and professional development?
This is my first time living abroad. I am learning a lot about how research is carried out in a completely different environment than the one I was used to. Here, I have the opportunity to work and collaborate with diverse scientists in a highly international scenario. This contributes not only to my scientific background but it has also been culturally enriching.
In your opinion, what are the most exciting developments or trends in quantum physics that we can expect in the coming years?
There's much to look forward to from the various platforms used to explore quantum mechanics. From the niche perspective of optics, we're seeing impressive developments in long-distance quantum information distribution and advances in scalable quantum computing hardware on photonic chips. At the same time, these technologies are still so infant that fundamental research is still crucial to their understanding and development. Furthermore, I also like the prospect of using quantum mechanics as measurement tools that haven't yet been utilized in industrial applications. From healthcare to environmental research, I expect quantum sensors to play a crucial role in measurement technologies in the short to medium term.
Do you have a special experience or anecdote from your time in Berlin that you would like to share with us?
After recently moving to Berlin, I attended a conference on quantum technologies. The conference continued until dinner, where I held some conversations until after 1:00 AM. It never occurred to me that one of Europe's largest cities would have limited public transportation schedules until I came across a closed gate in front of the subway entrance. This was in the city center, and I needed to get home, to Altglienicke, exactly in the middle of nowhere. After a couple of empty late buses and an hour-long walk that partially led through a dark forest, I managed to get home in two hours instead of 50 minutes. This made me realize two things: remembering to keep track of train schedules and that Berlin makes me feel very safe wandering around.
What advice would you give to young scientists who aspire to a career in quantum physics and might consider coming to Berlin?
Berlin has a rare feature in the quantum physics world: choice. There are three universities conducting high-quality research on various topics related to quantum physics. Furthermore, research institutes such as Fraunhofer and Ferdinand-Braun are part of the quantum landscape. If you're more industrially inclined, several representatives of large companies working with quantum-related technology have offices in the region. Now, if you want to participate in innovations or create something of your own, the start-up scene is also a strong point here. An added bonus is that initiatives like BERLIN QUANTUM connect people from all these fields. The beer isn't bad either.