Demonstration of Dissipative coupling from an Electrical-Magnetic friction coupled pendulum system

Laboratory pedagogy is considered absolutely critical for physics and engineering education ranging from high school to university. Among all universities worldwide, a well-known first-year physics experiment demonstration is a spring-coupled pendulums system. It demonstrates the coherent coupling; the underlying physics is reflected from classical mechanics to advanced quantum systems. It has excellent application from a tuned mass damper that reduced the unwanted vibration in skyscrapers and precision machining to data transformation of a quantum computer. However, coherent coupling is not the only existing coupling type. Recent discovery revealed the dissipative coupling phenomenon by replacing the conservative coupling force (spring) with a dissipative force such as friction. Unique effects such as level attraction and synchronization were observed in a Cavity-Magnonic system. These effects lead to significant potential applications in quantum information processing and more. Although, the early mentioned Cavity-Magnonic system is not available for entry-level students. The dissipative coupled pendulum system can be built and used as a gateway introduction that gives students a clear picture of this newly discovered phenomenon. In 2020, we created the simple coupled pendulum system prototype for the first time. An educational video and a publication are under construction.

Chenyang Lu
Faculty Supervisor: 
Can-Ming Hu
Partner University: