https://www.sciencedaily.com/releases/2022/03/220303112226.htm

A POSTECH research team led by Professor Yoon-Ho Kim and Dr. Yosep Kim (Department of Physics) has discovered a weak-value amplification (WVA) method that reaches the Heisenberg limit without using quantum entanglement. Heisenberg-limit refers to the precision ultimately achievable in quantum metrology.

WVA-based metrology, which is one of the methods for measuring quantum effects, is an approach to obtain the most information on the quantum system with minimal impact. It can efficiently measure the system without collapsing the quantum state.