Erlangen 2018 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 50: Quantum Gases (Bosons) V

Q 50.7: Talk

Wednesday, March 7, 2018, 15:30–15:45, K 2.020

Beating the classical precision limit with spin-1 Dicke state — Yi-Quan Zou, •Ling-Na Wu, Qi Liu, Xin-Yu Luo, Shuai-Feng Guo, Jia-Hao Cao, Meng Khoon Tey, and Li You — State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China

Entanglement plays an important role in quantum information and precision measurement. The generation of entangled states thus constitutes a research frontier and tremendous progresses along this direction have been made during the past decade. Among the variety of entangled states, Dicke states form an important class. Most of the Dicke states produced to date are limited to pseudo-spin-1/2 (two-level) particles. Here, we report the first generation of a balanced spin-1 Dicke state in a Bose Einstein condensate. We also demonstrate its application in precision measurement by performing a precise rotation angle measurement with the generated state as input, which leads to a measurement sensitivity beyond the classical limit.