Abstract: The 2025 Nobel Prize in Physics recognized the experimental verification of macroscopic quantum effects in circuits. This discovery laid the physical foundation for the currently burgeoning field of superconducting quantum computing. This article aims to introduce its principles and impact. We will first detail the prize-winning work, beginning with the fundamental principles of quantum tunneling and macroscopic quantum tunneling, and then elucidate how superconductors and Josephson junctions provide an ideal platform for observing these effects. Finally, we will describe how the laureates verified these macroscopic quantum phenomena through precise experimental techniques. We will furthermore explore the field of superconducting quantum computing, a technology developed based on these macroscopic quantum effects, covering its fundamental principles, implementation, current state of development, and future prospects.