It's important to detect weak signals in order to verify physics hypotheses and make breakthrough physics research. Enhancement is needed if the signals are not strong enough to measure. Enhancing the signals with quantum amplification is attractive. The state-of-the-art quantum amplification techniques rely on the inherent discrete state transitions of atoms and molecule and therefore lack tunability, which is a limitation.
The research team from the University of Science and Technology of China and the Chinese Academy of Sciences worked together to solve the problem. The result was published in a peer reviewed journal.
Floquet systems are described by time- dependent Hamiltonians. A Floquet system can jump between different levels of energy with resonance transitions. The combination of quantum amplification and the Floquet system is promising.
The researchers drove noble gas. The Hamiltonians of 129 Xe spins became time-periodic and the system obtained extra synthetic dimensions which allow resonance transitions in a broader range. Researchers used the 129 Xe Floquet spin system to demonstrate the amplification of weak waves at the same time.
A new amplification phenomenon called Floquet spin amplification is observed by this work. It greatly overcomes the limitations of conventional amplifiers, increases the operation bandwidth in femtotesla-level measurements, and allows amplification at different frequencies in the meantime. In the study of fundamental physics, this Floquet amplifier can be used.
More information: Min Jiang et al, Floquet Spin Amplification, Physical Review Letters (2022). DOI: 10.1103/PhysRevLett.128.233201 Journal information: Physical Review Letters
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