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[ Instrument Network Instrument R & D ] Recently, Guo Guangcan, an academician of the Chinese Academy of Sciences and a professor at the University of Science and Technology of China, has made new progress in coherent manipulation of nanomode acoustic mode. Professor Guo Guoping, associate researcher Song Yan, Deng Guangwei (now a researcher at the University of Electronic Science and Technology of China) and others have collaborated with Tian Lin, a professor at the University of California, Mercer, and the original Quantum Company to achieve spatially indirectly connected resonators Coherent control of the phonon mode. Relevant research results, titled Coherent phonon dynamics in spatially separated graphene mechanical resonators, were published in the Proceedings of the National Academy of Sciences (PNAS) published on March 2.
With the rapid development of nanotechnology, people have discovered that devices such as surface acoustic waves and nanoresonators can be used to generate, transfer and manipulate a few or even a single phonon, and explore its applications in classical and quantum information processing, many of which are The premise is to achieve coherent manipulation between different resonance modes. The study of spatially-adjacent coupled harmonicon phonon modes has been reported internationally, but long-range controllable coherent information transfer between non-adjacent phonon modes is still an internationally unsolved challenge. In response to this problem, Guo Guoping's research group focused on the phonon mode manipulation in nanoresonators, and made a series of advances in the neighborhood resonator and its coherent manipulation (Nano Lett.16, 5456 (2016); Nano Lett.17, 915 (2017)) and static electrical tunable non-nearest neighbor resonator coupling work (Nat. Commun. 9, 383 (2018)), three graphene nanoresonator series coupling devices were designed and prepared. Using the excellent electrical and mechanical properties of graphene, the tunable strong coupling between the phonon modes of the non-adjacent resonators at both ends is achieved using the intermediate resonator as the transmission medium. Through the optimization of the sample structure and measurement scheme, the coupling strength and quality factor have been improved by one and two orders of magnitude compared to previous work, respectively, and the synergy coefficient has reached 107, which is several orders of magnitude higher than the results reported internationally. Based on the simultaneous realization of strong tunable performance, high coupling strength, and good coherence performance, the research team demonstrated the Rabi oscillation, Ramsey interference, and its electrical regulation performance of the non-nearest-harmonic phonon mode.
This work for the first time experimentally achieves controllable coherent manipulation between non-neighboring phonon modes. It creates conditions for the further use of phonon modes in nanoresonator devices for coherent storage and coherent transmission of information, and extends nano-acoustics-based The possibility of integrated acousto-optical devices. Reviewers commented that “these results clearly exceed the level of coherent operation of existing harmonic oscillators in the classical regionâ€. With the further development of ground state cooling technology, this result will also provide a new way for the electrical manipulation of phonon states in the quantum region and the development of new hybrid quantum information devices based on phonon systems.
The co-first authors of the article are Zhang Zhuozhi, post-doctoral fellow, Song Yan, associate researcher, and Luo Gang, postdoctoral fellow, Key Laboratory of Quantum Information, Chinese Academy of Sciences. This work was supported by the Ministry of Science and Technology, the National Natural Science Foundation of China, the China Postdoctoral Science Foundation, and Anhui Province. Part of the sample processing process is completed at the Micro-nano Research and Manufacturing Center of the University of Science and Technology of China.