Erlangen 2018 – wissenschaftliches Programm

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SYQC: Symposium Quantum Coherence in Quantum Technology

SYQC 1: Quantum Coherence in Quantum Technology

SYQC 1.4: Hauptvortrag

Donnerstag, 8. März 2018, 15:30–16:00, RW HS

Experiments on directly measuring quantum coherence and using it for quantum sensing — •Chuan-Feng Li — CAS Key Lab of Quantum Information, University of Science and Technology of China, Hefei 230026, P. R. China

In this talk, I will first introduce the experiment on direct measurement of quantum coherence. We develop a method to measure coherence directly using its most essential behavior, i.e., the interference fringes. We also use the witness observable to witness coherence, and the optimal witness constitutes another direct method to measure coherence.Then I will introduce our recent work on demonstrating a novel quantum sensor based on rare-earth ions, which provides unprecedented long coherence time up to 4.3 hours for sensitive detection of low-frequency magnetic fields.