Nonlinear Nanomechanical Resonator Approaching the Quantum Ground State
ORAL
Abstract
We present measurements of a strong mechanical nonlinearity near the quantum ground state. The mechanical nonlinearity is generated by the ultrastrong coupling (500MHz) of a carbon nanotube mechanical resonator (30MHz) to an embedded quantum dot undergoing single-electron tunneling. The nonlinearity is far bigger than what has been realized thus far and results in highly nonlinear thermal vibrations. As the average displacement amplitude is decreased to 13 times the zero-point motion, approximately 42% of the thermal energy is stored in the anharmonic part of the potential. We also present transport measurements of clean and regular double quantum dot devices defined using a novel nanofabrication process. Such devices are necessary to coherently manipulate the nonlinear mechanical resonator in order to create mechanical qubit [1].
[1] F. Pistolesi, et al., PRX 11, 031027 (2021)
*We acknowledge support from ERC Advanced Grant No. 692876 and MICINN Grant No. RTI2018-097953-B-I00. Work performed at the Center for Nanoscale Materials, a U.S. Department of Energy Office of Science User Facility, was supported by the U.S. DOE, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357. We also acknowledge the European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska Curie grant agreement nos. 847517 and 101023289, AGAUR (Grant No. 2017SGR1664), the Quantera grant (PCI2022-132951), the Fondo Europeo de Desarrollo, the Spanish Ministry of Economy and Competitiveness through CEX2019-000910-S [MCIN/AEI/10.13039/501100011033], Recovery, Transformation and Resilience Plan-Funded by the European Union- NextGenerationEU (PRTR-C17.I1), Quantum CCAA, Fundacio Cellex, Fundacio Mir-Puig, Generalitat de Catalunya through CERCA.
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Publication:C. Samanta et al., S. L. deBonis, C. B. Moller et al., Nonlinear nanomechanical resonators approaching the quantum ground state, submitted, 2022. R. Tormo-Queralt, C. B. Moller et al, Novel nanotube multi-quantum dot devices, Nano Letters (accepted), 2022.
Presenters
Christoffer B Moller
ICFO-The Institute of Photonic Sciences
Authors
Christoffer B Moller
ICFO-The Institute of Photonic Sciences
Roger Tormo Queralt
The institute of Photonic Sciences (ICFO)
Chandan Samanta
ICFO-The Institute of Photonic Sciences
Sergio L De Bonis
ICFO-The Institute of Photonic Sciences
David Czaplewski
Argone National Laboratory
Center for Nanoscale Materials, Argonne National Laboratory, Argonne, IL 60439, USA
Fabio Pistolesi
Université de Bordeaux
Université de Bordeaux, CNRS, LOMA, UMR 5798, F-33400 Talence, France
