During the spring of 2022, I felt as though I kept dashing backward and forward in time.  At the beginning of the season, hay fever plagued me in Maryland. Then, I left to present talks in southern California. There—closer to the equator—rose season had peaked, and wisteria petals covered the ground near Caltech’s physics building.…

Quantum Frontiers is a platform dedicated to exploring the frontiers of quantum science and technology. Readers can find articles, interviews, and discussions on topics such as quantum physics, quantum computing, and quantum information theory. Additionally, they can learn about quantum experiments, quantum communication, and interdisciplinary research in quantum science.

Quantum Frontiers

Closed timelike curves from general relativity can be simulated in quantum systems to improve quantum metrology. A protocol using entanglement manipulation allows optimal measurement of interaction strengths by effectively teleporting quantum states backward in time. This approach solves the dilemma of not knowing the best sensor preparation state before measuring an unknown interaction. The theoretical work has led to experimental implementations and demonstrates how quantum correlations can enhance measurement precision beyond classical limits.

Make use of time, let not advantage slip