Researchers at the University of Oxford have demonstrated a new kind of quantum interaction using a single trapped ion. By carefully generating and controlling increasingly complex forms of "squeezing" -- including a fourth-order effect called quadsqueezing -- they have made quantum behaviors accessible that had previously been out of reach. The work also introduces a new way to engineer these interactions, with potential uses in quantum simulation, sensing, and computing. The findings were published today (May 1) in Nature Physics.
Many physical systems behave like tiny oscillating objects, similar to springs or pendulums. In quantum physics, these are known as quantum harmonic oscillators. This description applies to a wide range of systems, including light waves, molecular vibrations, and even the motion of a single trapped atom.
Controlling these oscillations is essential for modern quantum technologies. Applications range from extremely precise measurement tools to the development of next-generation quantum computers.
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