Academy of Mathematics and Systems Science, CAS
Colloquia & Seminars

Speaker:	安钧鸿教授，兰州大学
Inviter:
Title:	Quantum Metrology
Time & Venue:	2022.06.03 09:30-10:30 腾讯会议: 743-872-033
Abstract:	A quantum science-technology revolution is in the making. It is expected to bring a lot of scientific and societal benefits. A distinguished example is quantum metrology, which pursues to develop measurement protocols with higher precisions than the classically permitted shot-noise limit by using quantum resources, such as quantum entanglement, coherence, and squeezing. It has potential application in developing next-generation frequency standard, magnetometer, radar, navigation, and global positioning system. However, the practical realization of quantum metrology is challenged by the ubiquitous decoherence in quantum world. First, the stabilization of quantum metrology is challenged by decoherence. It has been found that decoherence generally forces the desired precision back to or even worse than the shot-noise limit, which is called the no-go theorem of noisy quantum metrology. Second, the scalability of quantum metrology is challenged by decoherence. It has been found that decoherence makes it is hard to prepare quantum states with a large amount of quantum resources. In this talk, I will first introduce the basis principle of quantum metrology and its applications in different scenarios. Then I will report our studies to break through these obstacles set by decoherence on quantum metrology.