Scientists Watch Quantum Jumps of Sound for the First Time
Stanford researchers directly observed quantum jumps of sound in real time, watching single phonons abruptly shift between energy states. This breakthrough could lead to better quantum computers, error correction systems, and highly sensitive sensors.
What Happened
Stanford researchers have recorded the first real-time quantum jumps of sound, watching single phonons abruptly vanish from one energy state to another. The team created a device that takes hundreds of measurements within two milliseconds to pinpoint the moment of a quantum jump. This represents a major milestone in quantum physics research.
Why It Matters
Quantum jumps—sudden transitions from one energy state to another—have been theorized since the early 1900s, with scientists first demonstrating these jumps in trapped ions in 1986 and later in photons in 2007. However, observing this phenomenon in sound waves—phonons—had remained elusive until now.
The breakthrough could open new paths for quantum computing, error correction, highly sensitive biological sensors, and next-generation sound-based devices. The advance has implications for quantum computing and sensing, as well as for improving everyday technologies, such as smartphones.
Technical Achievement
Stanford scientists confirmed the long-predicted ability of quantum units of sound, or "phonons," to suddenly change energy levels. Researchers observed a mechanical resonator suddenly transition from one energy state to another, and the team was able to take hundreds of measurements during the resonator's roughly two-millisecond vibration, allowing them to identify the moment the quantum jump occurred.
Path Forward
The technique could support sound-based quantum error correction and extremely sensitive measurements of mass, force, acceleration and strain. The research opens new avenues for developing quantum technologies at the mechanical level, complementing the photonic and ionic approaches demonstrated in prior decades.