Coherent control of a classical nanomechanical two-level system

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FAUST, Thomas, Johannes RIEGER, Maximilian J. SEITNER, Jörg P. KOTTHAUS, Eva M. WEIG, 2013. Coherent control of a classical nanomechanical two-level system. In: Nature Physics. 9(8), pp. 485-488. ISSN 1745-2473. eISSN 1745-2481. Available under: doi: 10.1038/nphys2666

@article{Faust2013Coher-26551, title={Coherent control of a classical nanomechanical two-level system}, year={2013}, doi={10.1038/nphys2666}, number={8}, volume={9}, issn={1745-2473}, journal={Nature Physics}, pages={485--488}, author={Faust, Thomas and Rieger, Johannes and Seitner, Maximilian J. and Kotthaus, Jörg P. and Weig, Eva M.} }

eng The Bloch sphere is a generic picture describing the coherent dynamics of coupled classical or quantum-mechanical two-level systems under the control of electromagnetic fields. It is commonly applied to systems such as spin ensembles, atoms, quantum dots and superconducting circuits. The underlying Bloch equations describe the state evolution of the two-level system and allow the characterization of both energy and phase relaxation processes. Here we realize a classical nanomechanical two-level system driven by radiofrequency signals. It is based on the two orthogonal fundamental flexural modes of a high-quality-factor nanostring resonator that are strongly coupled by dielectric gradient fields. Full Bloch sphere control is demonstrated by means of Rabi, Ramsey and Hahn echo experiments. Furthermore, we determine the energy relaxation time T<sub>1</sub>and phase relaxation times T<sub>2</sub> and T<sub>2</sub>*, and find them all to be equal. Thus decoherence is dominated by energy relaxation, implying that not only T<sub>1</sub> but also T<sub>2</sub> can be increased by engineering larger mechanical quality factors. Faust, Thomas 2014-02-25T09:32:46Z deposit-license Kotthaus, Jörg P. Coherent control of a classical nanomechanical two-level system Kotthaus, Jörg P. Faust, Thomas Seitner, Maximilian J. Nature Physics ; 9 (2013), 8. - S. 485-488 Seitner, Maximilian J. Rieger, Johannes Weig, Eva M. 2014-02-25T09:32:46Z 2013 Weig, Eva M. Rieger, Johannes

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