Quantum tunneling has many practical applications in technology. For example, it is used in the design of tunnel diodes, which are used in electronic circuits to generate high-frequency signals. It is also used in scanning tunneling microscopes, which allow scientists to image surfaces down to the atomic level. 

In addition, quantum tunneling is used in quantum computing, where it is used to store and manipulate data. It is also used in quantum cryptography, which is used to secure communications. Finally, quantum tunneling is used in quantum tunneling transistors, which are used in ultra-low power electronics.
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