Physicists have achieved a breakthrough in measuring the properties of superfluid helium, a quantum material that cannot be contained by traditional vessels due to its zero-viscosity nature. When cooled to near absolute zero, helium enters a superfluid state, allowing it to climb container walls and escape, which complicates experimental observation.
To overcome these boundary effects, researchers utilized a non-contact method involving superconducting magnetic levitation and optical tweezers. By suspending superfluid helium droplets in an ultra-high vacuum at cryogenic temperatures, the team successfully isolated the material from all solid surfaces.
The experiment employed laser probes and superconducting resonant sensors to monitor quantum vortex motion, sound propagation, and quasiparticle excitation energy. These measurements confirmed long-standing quantum many-body theory predictions regarding frictionless flow and macroscopic quantum coherence.
The findings provide critical data for developing next-generation quantum gyroscopes and cooling architectures for superconducting quantum computers. Additionally, the research offers insights into the behavior of superfluid nuclear matter within neutron stars, advancing the understanding of extreme astrophysical environments.
