A team of researchers has developed an advanced form of a phonon laser capable of manipulating vibrations at the nanoscale

The new form of phonon laser builds on previous laser research but shifts the focus from light particles to phonons, the fundamental units of sound and vibration.

A new kind of laser

Traditional lasers developed in the 1960’s rely on protons or particles of light to produce highly focused, controlled beams.

Since their development, these technologies have become essential in everyday tools and advanced scientific instruments. Over the past two decades, however, scientists have expanded the concept of lasers to control other types of particles, including phonons.

Phonon lasers operate by controlling mechanical vibrations rather than light. This makes them particularly useful for studying systems where motion, force, and energy transfer occur at extremely small scales. Their potential applications span quantum mechanics, sensing technologies, and even navigation systems.

Overcoming the challenges of noise

One of the biggest obstacles in developing practical phonon lasers has been noise. At the microscopic level, even the most stable systems experience fluctuations that can interfere with precise measurements. These disturbances, often caused by thermal energy, make it difficult to achieve the level of accuracy needed for advanced scientific applications.

The new research addresses this issue by introducing a technique known as “squeezing.” Squeezing reduces the natural fluctuations within the phonon system, effectively minimising noise and improving measurement precision.

By carefully controlling how light interacts with the vibrating particles, researchers were able to stabilise the phonon laser far beyond previous capabilities.

Precision at the nanoscale

The improved phonon laser works by trapping and levitating nanoparticles in a vacuum using optical tools. These particles act as carriers of vibrational energy, allowing scientists to manipulate phonons with remarkable control. By refining this system, the researchers achieved a level of sensitivity that could surpass traditional measurement methods based on light or radio waves.

This heightened precision opens the door to measuring extremely small forces, including subtle variations in gravity. Such capabilities are crucial for experiments that probe the fundamental laws of physics, particularly in the quantum realm, where conventional tools often fall short.

While still in the experimental stage, the technology has promising real-world implications. One potential application lies in navigation systems. Current global positioning technologies rely heavily on satellites, which can be disrupted or unavailable in certain environments.

Phonon-based systems could lead to the development of quantum compasses that operate independently of external signals, offering more reliable and secure navigation.

The ability to measure acceleration and gravitational effects with unprecedented accuracy could benefit fields such as geophysics, aerospace engineering, and even defence systems.