Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:


USTC realizes strong indirect coupling in distant nanomechanical resonators


New progress in graphene-based nanomechanical resonator systems has been achieved in Key Laboratory of Quantum Information and Synergetic Innovation Center of Quantum Information & Quantum Physics of USTC. The jointed group, led by Prof. GUO Guoping, Research Associate Prof. DENG Guangwei from USTC and Prof. TIAN Lin from UC Merced, realized strong coupling between distant phonon modes, by introducing a third resonator as a phonon cavity mode. Varying the resonant frequency of the phonon cavity mode, the coupling strength between distant phonon modes can be continuous tuned. The results were published on 26th Jan., entitled as "Strong indirect coupling between graphene-based mechanical resonators via a phonon cavity" in Nature Communications. [1]

With the advantages of small size, stability and high quality factors, nanomechanical resonators are considered as a promising candidate to storage, manipulate and transfer information. Both classical and quantum information can be encoded on phonon states of mechanical resonators.

Schematic and scanning electron microscopy image of device architecture with a chain of three graphene-based nanomechanical resonators.

Credit: @ university of science and technology of china

Phonon states can also transfer such information. Because of the rapid development of quantum acoustics, it is attracting more and more research interests. Huge amount of theoretical and experimental work have been done on connecting different systems, storing and transferring information via phonon states. [2]

The main problem of using nanomechanical resonator as information carrier is the realization of tunable phonon interaction at long distance. Many research groups around the world did a lot of studies on this problem. The most common way is to use optical cavities or superconducting microwave resonators as mediators. However, the difference between resonant frequencies of mechanical resonators and optical cavities or microwave resonators is too large. Also, the coupling strengths between them are relatively small, and hard to reach strong coupling regime.

Focusing on this problem, researchers proposed to employ mechanical resonator itself to act as a phonon cavity to replace the optical cavity or microwave resonator. The resonant frequencies of phonon cavity and mechanical resonators as information carriers are in the same range. Thus, these modes can be effectively coupled together. Previously, GUO's group realized strong coupling between neighboring mechanical resonators and coherent manipulation of phonon modes. [3, 4]

Based on these work, scientists designed and fabricated a linear chain of three graphene-based nanomechanical resonators, as shown in Fig. 1. In this device, the resonant frequency of each resonator can be tuned in a wide range via local bottom metal gates. Such tunability provides the possibility to realize and modulate the coupling between resonators in different frequency ranges. Firstly, they observed the mode splitting of each neighboring resonators.

It is found that in this structure, neighboring resonators are strongly coupled. Such results provide foundations for the study on the coupling between the first and the third resonator. When the resonant frequency of the center resonator is tuned near to that of the side resonators, large mode splitting can be observed. Also they found that the splitting can be widely tuned via tuning the resonant frequency of center resonator.

This phenomenon is similar to Raman process in optics. The center resonator can be regarded as a mediating state, the phonon modes of side resonators can achieve effective coupling via exchanging virtual phonon with the mediating state (Fig. 1). Using the theoretical model of optical Raman process, they got the relation between effective coupling strength and detuning. The experiment data agrees well with the theoretical results.

It is the first time to experimentally realize non-neighboring coupling in graphene-based nanomechanical resonators, and shed light on the studies of nanomechanical resonators. With the development of the studies on phonon states cooling, this work provides the foundation for storage and transfer of quantum information via phonon modes.


The co-first authors of this work is Dr. LUO Gang and Mr. ZHANG Zhuozhi from CAS Key Laboratory of Quantum Information. This work is supported by the Ministry of Science and Technology, National Natural Science Foundation of China, Chinese Academy of Sciences, Ministry of Education, National Natural Science Foundation of United States, University of California and the USTC Center for Micro and Nanoscale Research and Fabrication.


[1] G. Luo, Z.-Z. Zhang, G.-W. Deng, H.-O. Li, G. Cao, M. Xiao, G.-C. Guo, L. Tian, and G.-P. Guo, Strong indirect coupling between graphene-based mechanical resonators via a phonon cavity, Nature Commun. 9, 383 (2018).

[2] L. Tian, Optoelectromechanical transducer: reversible conversion between microwave and optical photons, Ann. Phys. (Berlin) 527, 1 (2015).

[3] G-W. Deng, D. Zhu, X-H. Wang, C-L. Zou, J-T. Wang, H-O. Li, G. Cao, D. Liu, Y. Li, M. Xiao, G-C. Guo, K-L. Jiang, X-C. Dai, G-P. Guo, Strongly coupled nanotube electromechanical resonators, Nano Lett. 16, 5456 (2016).

[4] D. Zhu, X-H. Wang, W-C. Kong, G-W. Deng, J-T. Wang, H-O. Li, G. Cao, M. Xiao, K-L. Jiang, X-C. Dai, G-C. Guo, F. Nori, G-P. Guo, Coherent phonon Rabi oscillations with a high frequency carbon nanotube resonator, Nano Lett. 17, 915 (2017).

Media Contact

Jane Fan Qiong 

Jane Fan Qiong | EurekAlert!

More articles from Physics and Astronomy:

nachricht Structured light and nanomaterials open new ways to tailor light at the nanoscale
23.04.2018 | Academy of Finland

nachricht On the shape of the 'petal' for the dissipation curve
23.04.2018 | Lobachevsky University

All articles from Physics and Astronomy >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: BAM@Hannover Messe: innovative 3D printing method for space flight

At the Hannover Messe 2018, the Bundesanstalt für Materialforschung und-prüfung (BAM) will show how, in the future, astronauts could produce their own tools or spare parts in zero gravity using 3D printing. This will reduce, weight and transport costs for space missions. Visitors can experience the innovative additive manufacturing process live at the fair.

Powder-based additive manufacturing in zero gravity is the name of the project in which a component is produced by applying metallic powder layers and then...

Im Focus: Molecules Brilliantly Illuminated

Physicists at the Laboratory for Attosecond Physics, which is jointly run by Ludwig-Maximilians-Universität and the Max Planck Institute of Quantum Optics, have developed a high-power laser system that generates ultrashort pulses of light covering a large share of the mid-infrared spectrum. The researchers envisage a wide range of applications for the technology – in the early diagnosis of cancer, for instance.

Molecules are the building blocks of life. Like all other organisms, we are made of them. They control our biorhythm, and they can also reflect our state of...

Im Focus: Spider silk key to new bone-fixing composite

University of Connecticut researchers have created a biodegradable composite made of silk fibers that can be used to repair broken load-bearing bones without the complications sometimes presented by other materials.

Repairing major load-bearing bones such as those in the leg can be a long and uncomfortable process.

Im Focus: Writing and deleting magnets with lasers

Study published in the journal ACS Applied Materials & Interfaces is the outcome of an international effort that included teams from Dresden and Berlin in Germany, and the US.

Scientists at the Helmholtz-Zentrum Dresden-Rossendorf (HZDR) together with colleagues from the Helmholtz-Zentrum Berlin (HZB) and the University of Virginia...

Im Focus: Gamma-ray flashes from plasma filaments

Novel highly efficient and brilliant gamma-ray source: Based on model calculations, physicists of the Max PIanck Institute for Nuclear Physics in Heidelberg propose a novel method for an efficient high-brilliance gamma-ray source. A giant collimated gamma-ray pulse is generated from the interaction of a dense ultra-relativistic electron beam with a thin solid conductor. Energetic gamma-rays are copiously produced as the electron beam splits into filaments while propagating across the conductor. The resulting gamma-ray energy and flux enable novel experiments in nuclear and fundamental physics.

The typical wavelength of light interacting with an object of the microcosm scales with the size of this object. For atoms, this ranges from visible light to...

All Focus news of the innovation-report >>>



Industry & Economy
Event News

Invitation to the upcoming "Current Topics in Bioinformatics: Big Data in Genomics and Medicine"

13.04.2018 | Event News

Unique scope of UV LED technologies and applications presented in Berlin: ICULTA-2018

12.04.2018 | Event News

IWOLIA: A conference bringing together German Industrie 4.0 and French Industrie du Futur

09.04.2018 | Event News

Latest News

Quantum Technology for Advanced Imaging – QUILT

24.04.2018 | Information Technology

AWI researchers measure a record concentration of microplastic in arctic sea ice

24.04.2018 | Earth Sciences

Complete skin regeneration system of fish unraveled

24.04.2018 | Life Sciences

Science & Research
Overview of more VideoLinks >>>