effects are prominent at 1D. In particular our data support a generalized Johnson-Nyquist expression for thermal noise in 1D transistors introduced in the paper. Finally we have benchmarked nanotube FETs against nanotube SETs for applications as fast single electron detectors. Authors acknowledge fruitful discussions with G. Dambrine, V. Derycke, P. Dollfus, C. Glattli, H. Happy and M. Sanquer. The research has been supported by french ANR un- der contracts ANR-2005-055-HF-CNT, ANR-05-NANO-010-01-NL-SBPC, and EU-STREP project CARDEQ under contract IST-FP6-011285. Acknowledgments [1] S. Gustavsson, R. Leturcq, T. Ihn, M. Studer, K. Ensslin, D.C. Driscoll, and A.C. Gossard, Nano Lett. 8 , 2547 (2006). [2] S. E. S. Andresen, F. Wu, R. Danneau, D. Gunnarsson and P. J. Hakonen, J. Appl. Phys 104 , 033715 (2008). [3] G. F` eve, A. Mah´ e, B. Pla¸cais, J.-M. Berroir, T. Kontos, A. Cavanna, Y. Jin, B. Etienne and D. C. Glattli Science 316 , 1169 (2007). [4] S.J. Tans, A.R.M. Verschueren, and C. Dekker, Nature 393 , 49 (1998) [5] J. Chaste, L. Lechner, P. Morfin, G. F` eve, T. Kontos, J.-M. Berroir, D. C. Glattli, H. Happy, P. Hakonen, B. Pla¸cais, Nano Lett. 8 , 525 (2008) [6] C. Rutherghen, D. Jain P. Burke, Nature Nanotech. . 4 , 911 (2009). [7] H. Pothier, S. Gueron, N.O. Birge, D. Esteve, M.H. Devoret, Phys. Rev. Lett. 779 , 3490 (1997). [8] M. Lazzeri, F. Mauri, Phys. Rev. B 73 , 165419 (2006). [9] M. Steiner, M. Freitag, V. Perebeinos, J. C. Tsang, J. P. Small, M. Kinoshita, D. Yuan, J. Liu, P. Avouris, Nature Nanotech. 4 , 320 (2009). [10] F. Wu, T. Tsuneta, R. Tarkiainen, D. Gunnarsson, T.H. Wang, and P.J. Hakonen , Phys. Rev. B 75 , 125419 (2007). [11] A. van der Ziel, Proc. IRE 50 , 1808 (1962). 6