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Schrödinger's cat is a thought experiment designed to explain quantum superposition and quantum measurement, which are the core characteristics of quantum physics. In this experiment, the cat inside the box can be both alive and dead at the same time (quantum superposition), and its state (dead or alive) is decided the moment the box is opened (measured). Such quantum superposition and measurement are not only the foundation of quantum physics, but also guarantee the safety of quantum computing and cryptography.

The research team, comprising Drs. Seongjin Hong, Hyang-Tag Lim, and Seung-Woo Lee from the Center for Quantum Information at the Korea Institute of Science and Technology (KIST, President Seok Jin Yoon), derived and verified the information preservation relation for the first time in . This strengthens the security of quantum information technologies even in the weak quantum measurement realm.

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