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Updated: Sep 13, 2025

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
Published on: May 30, 2014
Experimental Characterization of Quantumness Using the Uncertainty Principle, Coherence, and Nonlocality
Yan-Han Yang1, Xin-Zhu Liu1, Xing-Zhou Zheng1
1Southwest Jiaotong University, School of Information Science and Technology, Chengdu 610031, China.
None:
Heisenberg's uncertainty principle, coherence, and Bell nonlocality have been individually examined through many experiments. In this Letter, we systematically characterize all of this quantumness in a unified manner. We first construct universal uncertainty relations to reveal intrinsic features of incompatible measurements, which include all the state-independent uncertainties as special cases. We further extend to witness both quantum coherence and Bell nonlocality. We finally perform experiments with unified two-photon states and validate the uncertainty principle, coherence, and Bell nonlocality within experimental error. Our methods for witnessing quantumness are valuable in characterizing quantum correlations in quantum information processing.
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