2026-05-22 カリフォルニア工科大学（Caltech）
＜関連情報＞
- https://www.caltech.edu/about/news/tuning-into-quantum-sounds
- https://www.nature.com/articles/s41567-026-03225-3.epdf
- https://www.nature.com/articles/s41567-026-03225-3
ナノメカニカルシステムにおける固有のフォノン被覆状態 Intrinsic phononic dressed states in a nanomechanical system
M. Yuksel,M. P. Maksymowych,O. A. Hitchcock,F. M. Mayor,N. R. Lee,M. I. Dykman,A. H. Safavi-Naeini & M. L. Roukes
Nature Physics Published:14 April 2026
DOI:https://doi.org/10.1038/s41567-026-03225-3
Abstract
Nanoelectromechanical systems provide a platform for probing the quantum nature of mechanical motion in mesoscopic systems. Quantum effects are most pronounced when device vibrations are nonlinear, but it has been difficult to achieve vibrational nonlinearity at the single-phonon level. Here we report the observation of intrinsic mesoscopic vibrational states that are dressed by the interactions with a nonlinear quantum system. The nonlinearity results from the strong resonant coupling between an eigenmode of a nanoelectromechanical system resonator and a single, two-level system that is intrinsic to the device material. We control the two-level system in situ by varying the mechanical strain in the device, tuning it in and out of resonance with the nanoelectromechanical system mode. Varying the resonant drive or temperature allows a controlled ascent of the non-equidistant energy ladder of the hybridized system. Fluctuations of the two-level system on and off resonance with the mode induce switching between the dressed and bare states. These quantum effects directly emerge from the intrinsic material properties of mechanical systems without the need for complex, external quantum circuits. Our work offers insight into mesoscopic dynamics and provides the opportunity to harness nanomechanics for quantum measurements.
