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Inhibition of tunneling in optical bistability by a squeezed vacuum.

Squeezed states of light, which demonstrate the essentially quantum nature of the light field, were recently produced in the laboratory. We present an application of squeezed light to stability enhancement of optically bistable systems.1 Such systems may exist either of two macroscopic metastable states. Quantum fluctuations induce tunneling between these states thus determining their ultimate stability.