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Stochastic resonance in a double quantum dot system.

Amitabh Joshi1

  • 1Department of Physics, University of Arkansas, Fayetteville, AR 72701, USA. ajoshi@uark.edu

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|March 21, 2008
PubMed
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Stochastic resonance (SR) in a double quantum dot system was theoretically studied. The research found that by adjusting noise amplitude, the system

Area of Science:

  • Quantum physics
  • Condensed matter physics

Background:

  • Stochastic resonance (SR) is a phenomenon where a non-linear system's response to a weak periodic signal is enhanced by the addition of noise.
  • Quantum dot systems are nanoscale semiconductor devices with potential applications in quantum computing and electronics.

Purpose of the Study:

  • To theoretically investigate stochastic resonance (SR) in a double quantum dot system.
  • To explore the effect of varying white noise amplitude on the system's output signal-to-noise ratio.

Main Methods:

  • Theoretical modeling of a double quantum dot system with two discrete levels.
  • Applying a periodic driving signal and a white noise source with variable amplitude.
  • Analyzing the system's output signal-to-noise ratio.

Related Experiment Videos

Main Results:

  • The double quantum dot system exhibits stochastic resonance.
  • An improved output signal-to-noise ratio was observed, characteristic of SR.
  • The system's performance is sensitive to the amplitude of the applied white noise.

Conclusions:

  • Stochastic resonance can be effectively realized in a double quantum dot system.
  • The findings suggest potential for noise-enhanced signal processing in quantum devices.
  • Further research could explore practical applications of SR in quantum information technologies.