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We report a theoretical analysis and experimental observation of the quantumdynamics of a single vortex-antivortex (VAV) pair confined in a long narrowannular Josephson junction. The switching of the junction from thesuperconducting state to the resistive state occurs via the dissociation of apinned VAV pair. The pinning potential is controlled by external magnetic field$H$ and dc bias current $I$. We predict a specific magnetic field dependence ofthe oscillatory energy levels of the pinned VAV state and the crossover to a{\it macroscopic quantum tunneling} mechanism of VAV dissociation at lowtemperatures. Our analysis explains the experimentally observed {\it increase}of the width of the switching current distribution $P(I)$ with $H$ and thecrossover to the quantum regime at the temperature of about 100 mK.Comment: 4 pages, 3 figure

Quantum Dissociation of a Vortex-Antivortex Pair in a Long Josephson Junction