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Shot noise of a quantum shuttle
Tomás Novotný1, Andrea Donarini, Christian Flindt
1MIC-Department of Micro and Nanotechnology, Technical University of Denmark, DTU-Building 345 East, DK-2800 Kongens Lyngby, Denmark. tno@mic.dtu.dk
Physical Review Letters
|July 13, 2004
Summary
We developed a theory for shot noise in quantum nanoelectromechanical systems. Our findings show that quantum shuttling is a low-noise phenomenon, even in the quantum limit.
Area of Science:
- Quantum physics
- Nanoelectromechanical systems (NEMS)
Background:
- Shot noise is a fundamental aspect of electronic transport.
- Understanding noise in quantum systems is crucial for developing advanced devices.
Purpose of the Study:
- To formulate a theoretical framework for shot noise in quantum nanoelectromechanical systems.
- To analyze the noise characteristics of a quantum shuttle system.
Main Methods:
- Development of a quantum theory for shot noise.
- Application of the theory to a quantum shuttle model.
- Computation of the Fano factor (F) at zero frequency.
Main Results:
- The Fano factor (F) reaches very low values (approx. 10^-2) in the shuttling regime, even in the quantum limit.
- A giant enhancement in the Fano factor (approx. 10^2) is observed at the shuttling threshold when approaching the semiclassical limit.
- Results are consistent with phase-space representations of the density matrix.
Conclusions:
- Quantum shuttling is confirmed as a universally low-noise phenomenon.
- The study provides insights into noise behavior at the quantum-to-semiclassical transition in NEMS.