2025+-08-13 カリフォルニア工科大学（Caltech）
A scanning electron microscope image highlighting a single mechanical oscillator, “tuning fork,” from the new work. The false-colored golden lines in the image indicate the location of electrodes that transfer electrical signals between the superconducting qubit and the mechanical oscillator.Credit: Omid Golami
＜関連情報＞
- https://www.caltech.edu/about/news/using-sound-to-remember-quantum-information
- https://www.nature.com/articles/s41567-025-02975-w
マイクロ波光子用の機械的量子メモリ A mechanical quantum memory for microwave photons
Alkım B. Bozkurt,Omid Golami,Yue Yu,Hao Tian &Mohammad Mirhosseini
Nature Physics Published:13 August 2025
DOI:https://doi.org/10.1038/s41567-025-02975-w
Abstract
Superconducting qubits possess outstanding capabilities for processing quantum information in the microwave domain; however they have limited coherence times. An interface between photons and phonons could allow quantum information to be stored in long-lived mechanical oscillators. Here, we introduce a platform that relies on electrostatic forces in nanoscale structures to achieve strong coupling between a superconducting qubit and a nanomechanical oscillator with an energy decay time (T1) of approximately 25 ms, well beyond those achieved in integrated superconducting circuits. We use quantum operations in this system to investigate the microscopic origins of mechanical decoherence and mitigate its impact. By using two-pulse dynamical decoupling sequences, we can extend the coherence time (T2) from 64 μs to 1 ms. These findings establish that mechanical oscillators can act as quantum memories for superconducting devices, with potential future applications in quantum computing, sensing and transduction.
