Enhanced quantum tunneling in quantum Zeno dynamics freezing the momentum direction

Quantum tunneling is a fundamental quantum-mechanical effect involved in plenty of physical phenomena. Its control would impact these phenomena and the technologies based on them. We show that quantum probability through potential barrier can be increased to approach unity Zeno dynamics undergone by particle which direction momentum frequently monitored. first model measurements as selective von Neumann projections, then nonselective, direction-sensitive interactions with probe particles. Nonselective are more efficient than enhancing probability.