2026-09-17 スタンフォード大学
＜関連情報＞
- https://news.stanford.edu/stories/2026/09/first-real-time-quantum-jump-sound
- https://www.science.org/doi/10.1126/science.aeh7535
音の量子ジャンプ Quantum jumps of sound
Takuma Makihara, Erik Szakiel, Matthew P. Maksymowych, Oliver A. Hitchcock, […] , and Amir H. Safavi-Naeini
Science Published:17 Sep 2026
DOI:https://doi.org/10.1126/science.aeh7535
Abstract
Quantum mechanics predicts that a vibrating object’s energy comes in discrete packets, yet no measurement of its position reveals this discreteness. Resolving individual energy levels requires a qualitatively different measurement, one coupling to the resonator’s energy rather than its displacement. We use a superconducting qubit dispersively coupled to a nanomechanical resonator to perform repeated quantum nondemolition measurements of the phonon number. An aligned transfer-print technique integrating the qubit and resonator yields a mechanical lifetime of T1=2.1 milliseconds and a dispersive shift of 2χ/2π=328 kilohertz per phonon. We heralded single-phonon states with 85% fidelity and observed quantum jumps between the resonator’s first excited state and ground state. These discontinuous transitions are a striking manifestation of quantum mechanics in a massive, vibrating object.
