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- Title
EFFECT OF ASYMMETRY IN A BISTABLE SYSTEM WITH QUANTUM FLUCTUATIONS:: STRONG FRICTION LIMIT.
- Authors
ZENG, CHUNHUA; GONG, AILING; LUO, YUHUI
- Abstract
In this paper, we study the effect of asymmetry of the potential in a bistable system with quantum fluctuations. Within the quantum Smoluchowski regime, the expressions for the mean first passage time (MFPT) and signal-to-noise ratio (SNR) of the system are obtained, respectively. Based on the MFPT and SNR, we consider both, the overdamped quantum case and its classical counterpart, the effects of the quantum fluctuations and the asymmetry of the potential on the MFPT and SNR are discussed. Our main results show that (i) the quantum fluctuations facilitate the particle to reach the destination from its original position, (ii) the resonant activation (RA) phenomena can be observed with varying asymmetry of the potential, and (iii) the quantum effects in an asymmetric bistable system about SNR are prominent for lower temperatures and smaller asymmetry of the potential. Moreover, the quantum effects enhance the stochastic resonance (SR) of the system.
- Subjects
SYMMETRY (Physics); OPTICAL bistability; QUANTUM theory; FLUCTUATIONS (Physics); FRICTION; SIGNAL-to-noise ratio; LOW temperatures; STOCHASTIC resonance
- Publication
International Journal of Modern Physics B: Condensed Matter Physics; Statistical Physics; Applied Physics, 2011, Vol 25, Issue 32, p4331
- ISSN
0217-9792
- Publication type
Article
- DOI
10.1142/S0217979211059255