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Novel Transfer Method of Carbon Nanotubes and Sample Preparation of Tandem Carbon Nanotube Resonators
Strong coupling of two mechanical modes in carbon nanotubes
Based on the long-range coupling and long-range transmission of phonons, the quantum data bus research also needs to implement coherent manipulation of phonons. The study of high-order modes of mechanical vibration is of great significance for the coherent manipulation of ultra-sensitive sensors and phonons. At present, the related research on multi-mechanical mode coupling in the world mainly focuses on low-frequency resonators of 100 kilohertz. To realize more sensitive sensors and achieve faster phonon manipulation, it is necessary to further increase the resonant frequency of the resonator.
In view of the high-frequency phonon manipulation problems, Guo Guoping's team found that the vibration modes in different directions in a single carbon nanotube can all work in the order of 100 MHz. These two modes can be coupled by adding an additional parametric drive and pass. Adjusting the driving power can realize the linear regulation from weak coupling to strong coupling, which is completely consistent with the theoretical calculation results. The research results are published in Nanoscale 8, 14809 (2016). The research group achieved the coherent pull ratio operation of the phonons in the mechanical vibration by controlling the waveform of the driving microwave, observed 10 or more rabbi oscillations, is the largest record of the number of phonon operations in the current experiment, and the frequency of the rabbi operation is greater than 500 kHz, two orders of magnitude higher than previous reports. The research was published in the international magazine Nano Lett. 17, ASAP (2017). After a series of measures to cool the mechanical vibrations to the quantum ground state, the coherent manipulation of phonons will have broad application prospects in the field of quantum sensing and quantum information.
This series of work was funded by the Ministry of Science and Technology, the National Natural Science Foundation of China, the Chinese Academy of Sciences and the Ministry of Education.
(Original title: China University of Science and Technology has made series of progress in the related research of nano-electromechanical systems (NEMS))
[China Instrument Network Instrument Development] Chinese Academy of Sciences and Professor Guo Guangcan of the University of Science and Technology of China led the CAS Key Laboratory of Quantum Information to make a series of progresses in carbon nanotube-based nanoelectromechanical systems (NEMS). Guo Guoping of the laboratory solid-state quantum chip group cooperated with the Jiang Kaili research group of Tsinghua University and successfully achieved the strong coupling of two tandem carbon nanotube resonators and the strong coupling of two modes in a CNT resonator, and utilized This coupling enables the coherent manipulation of phonons. The relevant results were published in Nano Lett. 16, 5456 (2016), Nano Lett. 17, ASAP (2017) and Nanoscale 8, respectively. 14809 (2016)). Focusing on the goal of exploring the phonon as a quantum data bus, Guo Guoping’s research group conducted research on the long-range coupling of multi-mechanical oscillators, and for the first time realized the strong coupling of two series mechanical vibrators on a mechanically excited vibrator of a carbon nanotube. Two mechanical dipoles were strongly coupled with quantum dots, and the research results were published in the international magazine Nano Lett. 16, 5456 (2016). The new coupled mechanical oscillator device also provides a new platform for the study of electron-phonon coherent interaction, electronic long-range coupling, and electronic entanglement. The use of phonons as flying bits also provides new ideas, new methods and new ways for the research field of quantum data buses.