Quantum-fluctuation-induced spatial stochastic resonance at zero temperature.
We consider a model in which the quantum fluctuation can be controlled and show that the system responds to a spatially periodic external field at zero temperature. This signifies the occurrence of spatial stochastic resonance where the fluctuations are purely quantum in nature. Various features of the phenomenon are discussed.
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Department of Physics, University of Calcutta, 92 APC Road, Calcutta 700 009, India. paro@cucc.ernet.in